Nakamichi Service Manual Nakamichi BX-125 BX-125E 2 Head Cassette Deck
Nakamichi
Service Manual
Nakamichi BX-125 BX-125E 2 Head Cassette Deck
CONTENTS
2. 3.
1.
General 34.65 3.4) helt eo attire Eanes Stra ty, ala Ae a earths Ras Seats keel d eae Rd A oe coe aBeoatedel ty hae Ae 1 Test: Tapes and:Gauges «3.05006 3.5 ie ev cnewinaa Pd Soro ve a. ON goods SES RP de oboe BOR la ek Gi ee 2 Mechanical Adjustments: 2265-0516 666.002 Vinod Baia GS Soslle WR ats Bed eee wie Peewee De betta ey ihe 2
38. 21. Tape Guide Height Check for Record/Playback Head and Erase Head ................-02.. 2 8. 2. Head Base Stroke Check ...... 0.0... 0c cece eee ee ee een eee e ene ce ee 2 3. 3. Record/Playback Azimuth Alignment and Height Check .............. 0.00 eececcces 2 3. 4, Pressure Adjustment of Pressure Roller... 2... ee ee ee eee eee e eee 3 3. 5. Tape Travelling Check oo. 5.0 3.56e eee ee 8b adie Beck kG ae olga bags S08 OM Row ahaa ncaa 3 3. «6. Eject Damper Adjustment ......... 000000 c cece eee eee eee eben eee b ee neee 3 3. 7. Reel Motor Speed Adjustment in Play Mode ......... 0.0... 00. cece eee ence e een ee 3 3. 8. Tape. Speed Adjustments se. 5) 5 ee eees koe Svea cee he eae Bek Bk ea bo ly OR hg 3 3. 9. TUBPiCAbION 65) oso. 3. S552 eo ANE ek Ea eylee wee aticel Pode A et es ae a, ened mnaese pata no Le 3
Parts Location for Electrical Adjustment .........0.0 00000000 cece ee eee ee eee tence ene ne nenas 4 Electrical Adjustments...:3. 6 v0.6 a cvidieie Gis eS 5 be 0 bbe ae Ew OSA a bw N Oe bb ab ole waa Nba bs 5
5. 1. Adjustment Instructions 2... 0.0.00 00 0c cece eee eee ee ee eee eee e epee ne eens 5 5. 2. Playback Frequency Response Adjustment .......... 0.000 ee ee ece ce cee eee neeyees 7
Mechanism Ass’y and Parts List... 1.1... ee ee ee ne en eee een e eee een eneuns 8 6. 1. SY MEN SSI9 25 32 vetig sn red ce yarn tas hence yt a teu peer Me osc eae eye ae reese ay Bee a eat a BE cect 8 6. 2. Synthesis Mechanism Ass’y (A01) ........0.0 0.00. cece eee ee ee eee een eee eenns 9 6. 3. Mechanism, Ass’y-(BOL) so... co 4.ce28 5S be Gh edivnc ohaccw ee vba vane Seals ese av hh tbody elation g 11 6. 4. Rear. Panel. Ass’y (B02) © ss... cosy dace sb eee ooo wie ae Dae G aE eagle bia 13
Mounting Diagrams and Parts List .. 0.0.0... occ ee eee ee ee een eee nen ene eennnas 14 PALL Power Switch P.C.B. Ass’y 2.0... ccc ec ec eee tne ec eee e eee eee eseerteeeuas 14 Te 2. GED: PCB: Assy se ise laced tn. Gey ee 8 a aaa ts need eesti ee ea late gto tee ae be TA 7. 8. Timer Switch P.C.B. Ass’y ...... GiRaEES. oh toni Semin es 3.8, codons Ie settaco a encumid inno wind 14 7. 4, Shut-off P.C.B. Ass’y.......... Poe Gable elk ahd, See im, do Gis oe datos dh, Blige ce de ge onde Mitbne IS Be EM ee ge eae de 14 7. 6. Dolby NR Switch P.C.B. Ass’y 2... eee eee eee eee nee bbe nae 15 7. 6. Volume PC. Bs Assy 0 scsi bea a Seay ahiacs whee Ras ig oe aud atone Pons d ate ah Be oe SO 15 7. 7. Control Switch P.C.B. Ass’y 2... 2... ee eee ee eee eben een nenns 15 7. 8. Tape Switch P.C:B. Ags? V oe oh eed aaa goed. duels we Peg Se altaal bce bed Gow dow Bablate ohio wees 16 7. 9. Indicator P:C.By Ass? Y 225-5: Gee wie icky bec ROE apd Uae: Degen ati, 8 Bosh bossa eee aoe wha ate Oe eed Behe 16 7. 10. Main PC Bi Ass’ si Scares: « lead deal oda Wo wide ee bee OO ee ash Mate Ape ole A Natu Mota sod Se 17
Schematic! Diagtant s,s. 5 soo 2 sires an ere Bh woke vee bob GH Elander ates REE Oo Wee eave Wa aioe Cae ia ache tes bo 19 8. 1. I€ Block: Diagrams... 032i a)a aise 48 a a peo ere a Soa B Huy does wa ga old bral are Wee aoa 19 8. 2. Schematic Diagram ......... 0. cc ce ee ee eee teen ee cece nent en naaea 20
Wiring Diagranni >: ,.0..6 sie feet ed ite hot bin Talay Bobo ds SAR Bw aor Re wire bof ah bln au Ele eS Slav acta be nw Doe Qoasans. Godel 21
Block! Diagrams’: jc. <c<feis. fase. cisco Gatien ale wtay ete. Std Oe aha ope teies «ay Bar EvaNGES, gh haouba breceey oeet a acieie Rakdes 22 Timing Chart and Eq. Amp, Frequency Response ............. 000 cee cece eet eee e een eeennas 24 Specifications: 2 vi see esse cess puetiotn vo oe olin Bole Rite toolny ca ko ee erie Aa © alata Ae aN oh DEEN GDA aac tas Re ee eve 26
GENERAL
1.1. Voltage Selector Voltage selector is installed on the rear panel for Other version of the Nakamichi BX-125.
This voltage selector can select either 120 V or 220-240 V at customer’s disposal.
1.2. Packing Materials and Owner’s Manual
o “ Part No, Description Q
OFO3855A Carton Box BX-125 (Silver) OF03857A Carton Box BX-125 (Black) OFO3856A Carton Box BX-125E (Silver) OFO3858A Carton Box BX-125E (Black) OF03674C = Packing
0D04517A Owner’s Manual (English) 0D04518A Owner’s Manual (English/German/French)
0D04522A Owner's Manual (Japanese) HR Dee
1.3. Serial Number
The BX-125/BX-125E has two versions, Silver and Black.
In the service manual, serial numbers of these versions are identified as follows:
Silver version: A322xxxxx
Black version: A323xxxxx However, the actual serial number on the serial number plate of the BX-125/BX-125E is indicated as A322.3xxxxx.
The serial number begins with A322.301001.
ees Sanath
2. TEST TAPES AND GAUGES
(1) 400 Hz Level Tape (DA09005B)
(2) 1 kHz Track Alignment Tape (DA09007B)
(3) 15 kHz Azimuth Tape (DA09004B) (4) 3 kHz Speed and Wow/Flutter Tape (DA09006C)
(5) 10 kHz PB Frequency Response Tape (DA09003B)
(6) 15 kHz PB Frequency Response Tape (DA09002B) (7) 20 kHz PB Frequency Response Tape (DA09001B)
(8) Tape Travelling Cassette (DA09027B)
(9) Reference EXII Tape (DAO9066B) (10) Reference SX Tape (DA09025B) (11) Reference SX-E Tape (DA09086A)
(12) Reference ZX Tape (DA09037B) (13) Head Alignment Gauge (DA09092A)
3. MECHANICAL ADJUSTMENTS
3.1. Tape Guide Height Check for Record/Playback Head and Erase Head
With use of a Head Alignment Gauge, tape guide height check
for the Record/Playback and Erase Heads shall be made, wherein
a small block shall be pushed straight down to the base while in use of the Head Alignment Gauge. Refer to Fig. 3.1.
(1) Record/Playback Head Tape Guide Height
(a) Load the base of the Head Alignment Gauge carefully and set
the cassette deck in Play mode. (b) Place the small block of the Head Alignment Gauge on the
base.
(c) Slide the small block against the tape guide of the Record/
Playback Head, and check to insure that the block is ac- cepted by the tape guide,
(d) If not, loosen the screw and insert a shim (either 30 um (0C80048A), 60 um (0C80038A), or 100 um (0C80039A)) to raise the Record/Playback Head, then tighten and apply a
quantity of lock tight paint to the screw.
(2) Erase Head Tape Guide Height (a) Load the base of the Head Alignment Gauge carefully and set
the cassette deck in Play mode. (b) Place the small block of the Head Alignment Gauge on the
base,
(c) Slide the small block against the tape guide of the Erase Head, and check whether the block is accepted by the tape guide,
3.2, Head Base Stroke Check Refer to Fig. 3.2.
{1) Load the base of the Head Alignment Gauge carefully, then
push the base toward the Record/Playback Head to eliminate the clearance between the reference pin and the base.
(2) Set the cassette deck in Play mode.
(3) Place the small block of the Head Alignment Gauge on the
base,
(4) Contact the small block with the Record/Playback Head
surface and the Erase Head surface, and check whether the
end of the small block is located within the specified toler- ance as shown in Fig. 3.2,
3.3. Record/Playback Azimuth Alignment and Height Check Refer to Fig. 3.1.
(1) Connect a VTVM to the Output Jacks, (2) Load a 15 kHz Azimuth Tape and set the cassette deck in
Play mode,
(3) Turn the Azimuth Alignment Screw until the outputs of both channels become maximum.
(4) Load a 1 kHz Track Alignment Tape and set the cassette deck in Play mode,
(5) Check to insure that the readings of both channels on the VTVM are below —25 dB.
If not, replacement of the Record/Playback Head will be required.
(6) Apply a quantity of lock tight paint to the Azimuth Align-
ment Screw,
Shim
3.4. Pressure Adjustment of Pressure Roller Refer to Fig. 3.3.
(1) In Play mode, measure the torque of the Pressure Roller and
check whether the torque is in a range of 320 +50 g-cm. (2) If torque is out of the range, correct it by changing the instal-
lation point of the Pressure Roller Spring.
3.5. Tape Travelling Check
Load a Tape Travelling Cassette and set the cassette deck in Play mode to check the followings:
(1) After more than 2 seconds, the fluctuation of the tape travel- ling on the Record/Playback Head is small.
(2) Tape is in contact with the head sufficiently.
(3) Tape waving is small on the heads and pressure roller,
3.6. Eject Damper Adjustment
Refer to Fig. 3.4, Load a cassette tape, and with opening the
Cassette Case by pressing the Eject button and closing it by hand,
adjust the speed of damper action by the Damper Adjustment Screw.
CCW: Damper moves fast. CW: Damper moves slowly.
3.7, Reel Motor Speed Adjustment in Play Mode
(1) To warm-up the cassette deck, load a C-60 cassette tape and
set the cassette deck in Play mode.
(2) After more than four minutes, load a torque meter TW-211
(made by Sony) and set the cassette deck in Play mode.
(3) Adjust VR601 on the Main P.C.B. Ass’y to obtain exactly 50 g-cm on the torque meter.
3.8. Tape Speed Adjustment Refer to Fig. 3.5. (1) Connect a frequency counter to the Output Jacks.
(2) Load a 3 kHz Speed and Wow/Flutter Tape and play it back,
(3) Adjust the Tape Speed Adjustment Volume incorporated in the Capstan Motor to obtain 3,000 Hz on the frequency
counter,
CCW: Motor drives slowly.
CW: Motor drives fast.
3.9. Lubrication The tape transport is of a lubrication-free type mechanism. When the following parts are replaced, apply the specified lubricant, (1) Molykote (R) Grease (X5-6020)
Cam Motor Pulley Thrust portion on the Capstan Shaft
(2) FLOIL GB-TS-1
Washer between Reel Hub Ass’y and Back Tension Spring (8) Diamond Oil (EP56)
Reel Hub Shaft
(4) Anderol 456
Capstan Shaft
Note: We suggest that you use the above specified lubricant or equivalent type.
The company dealing in the above lubricant is as follows: (a) Molykote (R) Grease (X5-6020)
Dowcorning Co., Ltd., 1-15-1 Nishishinbashi, Minato-
ku, Tokyo, Japan
(b) FLOIL GB-TS-1 Kanto Chemicals Co., Ltd., 2-7 Kanda Sakuma-cho,
Chiyoda-ku, Tokyo, Japan
(c) Diamond Oil (EP-56) Mitsubishi Oil Co., Ltd., 1-2-4 Toranomon, Minato-ku,
Tokyo, Japan
(d) Anderol 456
Toyo Kokusai Oil Co., Ltd., 3-3-5 Hatchobori, Chuo- ku, Tokyo, Japan
Fig. 3.3
‘4 Increase
Damper Adjustment Screw
Fig. 3.4
Decrease N
Increase
Fig. 3.5
4, PARTS LOCATION FOR ELECTRICAL ADJUSTMENT
Main P.C.B. ®
free eo Level
VR1I08 VR208
io) (o) MPX iflter
vR6ol
Reel Motor Speed VRIO4 VRI03 VRIO2
{Play}
EX Rec. Cal. Sx zx Playback Level
VR204 VR203 VR202
@ oo F102 TP103
(o)uss Bias Trap (Record)
Peaking
TP203 TP102
pee L203 TP202
T301
@ Bias Osc. Frequency A317
Bi = jas ut
VR105 VRI06 VRIO7 U3
aee VR205 VR206 VR207
Tape Switch P C.B.
Fig. 4
5. ELECTRICAL ADJUSTMENTS
Note: Electrical adjustment should be performed after mechanical adjustment is completed. 5.1. Adjustment Instructions
OUTPUT
CONNECTION
Playback
Eq. - 70 ys Adjust the volume incorporated in the capstan motor to obtain 3 kHz +0.5% on the frequency counter.
Frequency
Counter to
Output
Jacks
Tape Speed
Adjustment
1. Feed in 400 Hz and adjust the Input
Level controls to obtain 350 mv -0.8 dB on the VIVM.
2. Adjust VR108 (VR208) so that the 0 dB segment of the level meter starts
illuminating.
3. Adjust the Input Level controls to obtain 350 mV on the VIVM, then
decrease the generator output level by
20 dB. 4. Check to insure that the segment for
-20 dB illuminates.
VIVM to
TP101,TP201 on Main
P.C.B.
Meter Level|400 Hz to Record, Pause/Main
Calibration] Input Jacks
Set the Output Level control to max,
Adjust the Input Level controls to obtain 500 mV (0 dB) on the VTVM.
2. Set the MPX Filter switch to ON and adjust L105 (L205) to obtain minimum reading on the VIVM (minimum reading will be less than -30 dB).
Record, Pause|Main MPX - OFF/ON |P.C.B.
19 kHz
+100 Hz to
Input
Jacks
MPX Filter Adjustment
Adjust the Record/Playback Head Azimuth Alignment Screw to obtain maximum readings for both channels on the VTIVM.
VIVM to
Output
Jacks
Playback Eq. - 70 ps
Dolby NR - OFF
MPX - OFF
Record/ Playback Head
Azimuth Alignment
Adjust VR101 (VR201) to obtain 350 mV on the VIVM.
VTIVM to Same as above|Main TP101,TP201
on Main
P.C.B.
400 Hz Level Tape
Playback Level
Calibration
- Load a 400 Hz level tape and play it back,
Adjust the Output Level control toa
certain level.
2. Load 10 kHz, 15 kHz and 20 kHz PB
400 Hz Same as above |Main Level Tape| Output
10 kHz PB | Jacks
Frequency
Response
Playback Frequency
Response
Adjustment
Tape frequency response tapes and play 15 kHz PB them back, Adjust the record/play-
Frequency back head azimuth to obtain maximum Response readings for both channels on the
Tape VTIVM with each tape.
20 kHz PB Short R110 (R210) or R195 (R295) on Frequency the Main P.C.B. Ass'y to obtain the Response following levels against the lewel for Tape the 400 Hz level tape.
10 kHz: -20 dB -2 to +2 dB
15 kHz: -20 dB -2 to +3 dB
20 kHz: -20 dB -2 to +4 dB
3. Conduct step 4 "Record/Playback Head
Azimuth Alignment".
STEP ITEM picasras pena REMARKS
pemecriiae
7 |Bias Frequency |Record, Pause Tape - Connect an additional 0.1 ohm resistor
Oscillation Counter to |Tape - ZX in series to the Erase Head and
Frequency CN2-2 on Eq. - 70 ps -C. connect a VIVM across it. and Erase Tape Switch] Dolby NR - 2. Adjust T301 to obtain 105 kHz on the Current P.C.B. OFF frequency counter,
Adjustment and MPX - OFF 3. Check the erase current by the VTVM.
310 mA to 400 mA (typically approx. VIVM across Erase current will be in a range of
350 mA).
the
additional
0.1 ohm If erase current is not sufficient,
resistor increase it by shorting either R318 or
R350. 4. After completion of the erase current
adjustment, re-check the bias
oscillation frequency, 5. Remove the additional 0.1 ohm
resistor,
21 kHz VIVM to Same as above|/Main Short the bias cut points indicated in Record
Amplifier |(-20 dB) |TP102,TP202 -C.B. Fig. 4 with a clip to stop bias Equalizer to Input on Main oscillation,
Adjustment | Jacks P.C.B. 2. Adjust L102 (L202) to obtain peak reading at 21 kHz on the VIVM.
Remove the clip.
Adjust L103 (L203) to obtain maximum reading on the VTVM.
Bias Trap |None VIVM to Same as above
Adjustment | (remove TP103 ,TP203 (Record input on Main Amp.) signals) |P.C.B.
Record 400 Hz VIVM and Record and Adjustment should be made in the order of Level (0 dB) and} Distortion |Playback ZX, SX and EX. Calibration|15 kHz Meter to Tape - ZX/SX/| (Level) and (-20 dB) Output EX ZX: 1. Set the Output Level control to max.
Recording to Input | Jacks Eq. - 70 ps VR102 2. Set the cassette deck in Record/Pause Bias Jacks (ZX/SX) mode, Current 120 ps 3. Feed in 400 Hz and adjust the Input
Adjustment (EX) Level controls to obtain 500 mV Dolby NR - (O dB) on the VTVM.
OFF 4. Load a reference ZX tape, reference
MPX - OFF SX/SX-E tape and reference EXII tape. 5. Feed in 400 Hz (0 dB) and record,
rewind and play it back. Adjust VR102 (VR202) for ZX tape, VR103 (VR203) for SX/SX-E Tape and VR104 (VR204) for EXII tape so that the played back output levels are 500
mV (0 dB) on the VTVM. Feed in 15 kHz (-20 dB) and record,
rewind and play it back. Adjust VR105 (VR205) for ZX tape, VR106 (VR206) for SX/SX-E tape and VR107 (VR207) for EXII tape so that the played back output levels are 50
mV (-20 dB) on the VIVM. 7. Repeat above 5 and 6 two or three
times.
8. Feed in 400 Hz (0 dB) and record, rewind and play it back. Check to insure whether the total harmonic
distortion is less than 1.0% for ZX
and EXII tapes and 1.2% for SX/SX-E tape. If the total harmonic dis- tortion exceeds the specified value,
repeat above steps till satisfactory results are obtained.
Switch
P.C.B.
(Bias)
a
ITEM SIGNAL OUTPUT MODE ADJUST~
SOURCE CONNECTION MENT
Overall 400 Hz Record and Set the cassette deck in Record/Pause Frequency | (0 dB) and| Output Playback mode. Response 20 Hz to Tape - ZX/SX/| L102 Feed in 400 Hz and set the Input Level Adjustment |17 kHz EX controls to obtain 500 mV (0 dB) on
(-20 dB) Eq. - 70 ps the VIVM. to Input (2X/SX) Decrease the generator output control Jacks 120 ps by 20 dB.
(EX) Feed in 20 Hz to 17 kHz (-20 dB), and Dolby NR - record, rewind and play them back,
OFF then check to insure whether the out- MPX SW - OFF put levels are within -20 dB +4 dB.
. If above is not sufficient, adjust L102 (L202) to obtain approx. ~20 dB on the VIVM, then conduct step 10
"Record Level Calibration and Recording Bias Current Adjustment". If above is not sufficient, precise re-adjustment of step 6 "Playback Frequency Response", replacement of
Record/Playback Head or tape travel- ling check will be required.
5,2, Playback Frequency Response Adjustment
Figs. 5.1 and 5.2 show the playback amp. circuit for adjustment The peaking portion of the equalization curve compensates the and the playback equalization curve. gap loss of the playback head, Peaking level is varied by the short This adjustment will be required if playback level is not sufficient circuit of R110 (R210) or R195 (R295). when a 20 kHz PB frequency response tape is played back.
R RIO RI9S (R210) (R295) 680 1K R/P
Head VRIOt [VR201)
Output
390P
HI
C108 (C208) 1000P
+H C107 (C207) 120y8
Fig. 5.1
GAIN (dB)
FREQUENCY (Hz)
Fig. 5.2
6. MECHANISM ASS’Y AND PARTS LIST
6.1. Synthesis
01
HA04494B 0H04582B 0H04583B 0304628A 0H04306A 0H04240A HA04571A OJ04765A OH04276A 0H04432B 0OHO3737A 0H04155B 0M04377B 0J04629A
0J04762A OJ03564A OE03054A OE03033A
OEO0868A OEOO865A
Description
Synthesis Serial No.: 432201001 - (Silver)
Cassette Case Cover Ass’y Front Panel Ass’y BX-125 Front Panel Ass’y BX-125E Top Cover Cushion (Front) Meter Cover LED Lens Eject Button Ass’y Spring Counter Escutcheon Volume Knob Volume Knob Base Top Cover Caution Label Top Cover Cushion (Back) Synthesis Mechanism Ass’y Bottom Cover Leg T-H BT 3x8 © Countersunk BT 4x8 © Pan Washer-faced
(Nickel) BT 3x8 © Binding BT 3x10 © Binding
Fig. 6.1
PAT PP RPE NN BHP PEN ee
HA04495B 0H04584B 0H04585B 0J04628A 0HO04307A 0H04240A HA04570A OJO4765A OH04275A 0H04342A OHO3737A 0H04156B 0M04377B 0J04629A
0J04762A 0J03564A OE03054A 0E03032A
OEOO868A OEO00865A
Synthesis Serial No.: A32301001 - (Black)
Cassette Case Cover Ass’y Front Panel Ass’y BX-125 Front Panel Ass’y BX-125E Top Cover Cushion (Front) Meter Cover LED Lens Eject Button Ass’y Spring Counter Escutcheon Volume Knob Volume Knob Base Top Cover Caution Label Top Cover Cushion (Back) Synthesis Mechanism Ass’y Bottom Cover Leg T-H BT 3x8 6 Countersunk BT 4x8 © Pan Washer-faced
(Black Chromate) BT 3x8 © Binding BT 3x10 & Binding PWD PPR EEN Re Hee Hee
6.2, Synthesis Mechanism Ass’y (AO1)
Schematic Ref, No.
OH04277A HAO04794A OHO4288A BA05637A 0J04838A BA05635A 0J04984A BA05630A OJO4767A BAO5089A 0H04289A 0H04283B 0H04272A 0J04703A 0J04704A BAO5639A 0J04840A BA05638A 0H04274A O0C08602A 0J04764A O0C08604A 0H04309A BA05641A 0304843A BA05640A OBO08511A 0J04611A 0H04290A BA05230A
BA05231A
BA05229A
0M04196A 0H04154C CA08498A BA05131A BAO5627A BA02757A-E 0J04603F 0J04773D HA04759B
HAO04791A HAO04760A HAO4761A
HA04771B HA04758A HA04762A
OBO851i5A 0J04581A OB08525A
OBO8854A 0B08347U
0M04131B
0B08349B
OEO0868A OEOO766A OE03074A
OEOO857A OBO8583A
OE00859A OE03070A OEO00835A OE00824A OE00954A 0E03028A
Description
Synthesis Mechanism Ass’y Serial No.: A32201001 - (Silver)
Meter Scale Front Chassis Ass’y Push Switch Button Tape Switch P.C.B. Ass’y Holder Dolby NR Switch P.C.B. Ass’y Cushion A LED P.C.B. Ass’y Memory Switch Holder Indicator Ass’y Slide Volume Knob Slide Volume Plate Memory Switch Knob Bushing A Bushing B Volume P.C.B. Ass’y Indicator P.C.B. Holder Indicator P.C.B. Ass’y Counter Knob Tape Counter Counter Holder Counter Belt Slide Switch Knob Timer Switch P.C.B. Ass’y Timer Switch P.C.B. Holder Control Switch P.C.B. Ass’y Headphone Jack Headphone Plate Power Switch Button Power Switch P.C.B. Ass’y BX-125
(U.S.A. & Canada) Power Switch P.C.B. Ass’y BX-125
(Japan) Power Switch P.C.B. Ass’y BX-125
(Australia & Others) & BX-125E
Cassette Label (Silver) Cover Plate Mechanism Ass’y Earth Wire Main P.C.B. Ass’y BX-125 Main P.C.B. Ass’y BX-125E Side Chassis L Side Chassis R Rear Panel Ass’y BX-125
(U.S.A.) Rear Panel Ass’y BX-125 (Japan) Rear Panel Ass’y BX-125 (Others) Rear Panel Ass’y BX-125
(Australia) Rear Panel Ass’y BX-125 (Canada) Rear Panel Ass’y BX-125E (UK) Rear Panel Ass’y BX-125E
(220V Class 2) Insu-Lock Counter Cushion Fuse 2A 250V BX-125
(U.S.A., Canada & Others) Fuse 2A BX-125 (Japan) Fuse T1A 250V BX-125
(Australia) & BX-125E Fuse Label T1A BX-125
(Australia) & BX-125E Fuse Clip BX-125 (Australia) &
BX-125E BT 3x8 6 Binding M3x8 © Binding BT 2.6x8 @ Binding with Toothed-
Lock Washer BT 3x6 © Binding Plastic Rivet Nut Washer BT 2.6x6 © Binding M2.6x6 © Binding BT 3x25 @Pan BT 2.6x6 ® Pan (Black Chromate) BT 2.6x8 © Binding BT 3x8 © Binding (Nickel)
BOHM BER eR Ree I ee ee
i
ee
ONT PB BP NN NWR BHR BEE Be Ree eR
An
DD Re OO et
To
10
0H04278B HA04795A 0H04248A BA05637A OJ04838A BA05635A 0J04984A BA05630A OJ04767A BA05089A 0H04247B 0H04284B OHO04271A 0J04703A 0J04704A BA05639A 0J04840A BA05638A 0H04273A OC08602A 0J04764A O0C08604A 0H04242A BAO5641A 0J04843A BA05640A OBO8511A 0J04611A 0H04243A BA05230A
BA05231A
BA05229A
0M04392A 0H04154C CA08498A BAO5131A BA05627A BA02757A-E 0J04603F 0J04773D HA04764A
HAO04792A HA04765A HA04766A
HAO04772A HA04763A HAO4767A
OBO8515A 0304581A OBO8525A
OB08854A 0B08347U
0M04131B
OBO8349B
OE00868A OEOO766A OE03074A
OEOO857A OB08583A
OEOO859A 0E03070A 0E00835A OE00824A OE00954A OE00921A
Description
Synthesis Mechanism Ass’y Serial No,: A32301001 - (Black)
Meter Scale Front Chassis Ass’y Push Switch Button Tape Switch P.C.B. Ass’y Holder Dolby NR Switch P.C.B. Ass’y Cushion A LED P.C.B. Ass’y Memory Switch Holder Indicator Ass’y Slide Volume Knob Slide Volume Plate Memory Switch Knob Bushing A Bushing B Volume P.C.B. Ass’y Indicator P.C.B. Holder Indicator P.C.B. Ass’y Counter Knob Tape Counter Counter Holder Counter Belt Slide Switch Knob Timer Switch P.C.B. Ass’y Timer Switch P.C.B. Holder Control Switch P.C.B. Ass’y Headphone Jack Headphone Plate Power Switch Button Power Switch P.C.B. Ass’y BX-125
(U.S.A. & Canada) Power Switch P.C.B. Ass’y BX-125
(Japan) Power Switch P.C.B. Ass’y BX-125
(Australia & Others) & BX-125E
Cassette Label (Gold) Cover Plate Mechanism Ass’y Earth Wire Main P.C.B. Ass’y BX-125 Main P.C.B. Ass’y BX-125E Side Chassis L Side Chassis R Rear Panel Ass’y BX-125
(U.S.A.) Rear Panel Ass’y BX-125 (Japan) Rear Panel Ass’y BX-125 (Others) Rear Panel Ass’y BX-125
(Australia) Rear Panel Ass’y BX-125 (Canada) Rear Panel Ass’y BX-125E (UK) Rear Panel Ass’y BX-125E
(220V Class 2) Insu-Lock Counter Cushion Fuse 2A 250V BX-125
(U.S.A., Canada & Others) Fuse 2A BX-125 (Japan) Fuse 1AT 250V BX-125
(Australia) & BX-125E Fuse Label 1AT BX-125
(Australia) & BX-125E Fuse Clip BX-125 (Australia) &
BX-125E BT 3x8 ® Binding M3x8 @ Binding BT 2.6x8 © Binding with Toothed-
Lock Washer BT 3x6 @ Binding Plastic Rivet Nut Washer BT 2.6x6 & Binding M2.6x6 © Binding BT 3x25 @ Pan BT 2.6x6 @ Pan (Black Chromate) BT 2.6x8 © Binding BT 3x8 @ Binding
(Black Chromate)
1
BP HP BRB REE E RP EE Ee e ePeeENENDe eP ee
ba
wm
OC WN PB FP ND NOR HR PPR Pee eRe
an Re
PHD HHO HE
vo
6.3, Mechanism Ass’y (B01)
Fig. 6.3
il
Schematic Ref, No.
CA08498A
CA80001A 0G01371A OC80001A 0G01365A 0C80044A 0C80045A 0C80003A 0C80004A OC 80005A OC80006A CA80002A CA80003B CA80004B OC80007A CA80005A OC80008A OC80009A 0C80010C 0C80043A 0C80012A 0C80013A 0C80014A 0C80015B 0C80016A OC80017A 0C80018A 0C80019B 0C80020A OC80021A CA80006A 0C80022B 0C80023A 0C80024A 0C80025A 0C80026A 0C80027A CA80007A 0C80028A CA80011A 0C80029A 0C80030A CA80008B 0C80031A 0C80033A 0C80034A CA80009A 0C80035A 0C80036A CA80010A OC80037A 0C80040A 0C80041A 0C80042A 0C80635B 0C80046A OE03038A 0E03053A 0C80048A 0C80038A 0C80039A OE03046A 0E03042A 0E03049A OE03050A 0E00222A 0E03043A OEO0698A OE03052A 0E00181A 0E03048A 0E03036A 0E03044A OEOO691A OE03045A OE03051A OE03037A 0£03047A OE03041A OE03040A 0E03035A OE03245A
Description
Mechanism Ass’y Serial No.: A322.301001 -
Cassette Case Ass’y Record/Playback Head RP-2G Azimuth Adjust Spring Erase Head E-2D Erase Head Collar Record/Play back Head Collar Head Base Hold Plate Steel Ball 3mm Reinforcement Plate Head Base Brake Ass’y Take-up Reel Hub Ass’y Supply Reel Hub Ass’y Steel Ball 2mm Pressure Roller Ass’y Pressure Roller Spring Cassette Case Spring Cassette Case Holder R 5P-H Connector Eject Sensor Lock Lever Spring Lock Lever Collar Lock Lever Brake Spring Record Protector Lever Cassette Case Holder L Eject Spring Eject Lever Spring Eject Lever Pneumatic Damper Ass’y Cassette Hold Spring Mechanism Chassis Record Protector Record Protector Holder Cam Mode Switch Control Motor Ass’y Control Motor Holder Shut-off P.C.B. Ass’y Back Tension Spring Reel Motor Holder Reel Motor Ass’y Capstan Flange Fly wheel Capstan Belt Fly wheel Holder Ass’y Sleeve Floating Rubber Capstan Motor Ass’y Insu-Lock 2P-H Connector 4P-H Connector 9P-H Connector Idler Pulley Azimuth Alignment Screw M2x12 © Binding Wire Holder Shim 0,.03T Shim 0.06T Shim 0.1T M2.6x6 @ Pan (2A) FT 2.5x5 ®Pan Washer 1.8mm Washer 3.1mm E-Ring 2mm FT 2.5x10 @ Pan E-Ring 2.5mm Stopper Ring 2.4mm E-Ring 3mm FT 2.6x6 ®@Pan M2x4 © Pan (2A) FT 2.5x20 © Pan M2x3 @ Pan M2.6x3 ® Binding Washer 2.5mm M2x5 @ Pan (2A) M2.6x9 @ Pan FT 2,5x4 ® Pan FT 2.5x3,.5 @ Pan M2x3.2 ® Truss Mylar Washer 1.3x3.3x0.3
1 1 1 1 2 1 1 1 1 1 1 1 1 3 1 1 1 1 1 1 L 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 1 1 1 3 1 a 1 1 1 1 3 3 1 3 1 1 1 1 1 3 1
HERP N WOH RDN He Rh eee OO
12
6.4. Rear Panel Ass’y (B02)
05
Fig. 6.4
Schematic Ref, No.
Part No, Description
01
02
03
04
HA04759B HA04771B
HAOA761A
HAO4791A HA04760A HA04758A HA04762A
0HO4586A 0HO4587A BAO5087A
(0B81001A) (OE00037A) 0B50040A
0B50009B
0B50011B
0B50010B
0B08037U
OBO8351A
Rear Panel Ass’y BX-125 (U.S.A.) Rear Panel Ass’y BX-125
(Canada) Rear Panel Ass‘y BX-125
(Australia) Rear Panel Ass’y BX-125 (Japan) Rear Panel Ass’y BX-125 (Others) Rear Panel Ass’y BX-125E (UK) Rear Panel Ass’y BX-125E
(220V Class 2) Serial No.: A32201001 - (Silver)
Rear Panel BX-125 Rear Panel BX-125E 4P Pin Jack Ass’y (Consists of the
followings) (4P Pin Jack) (Earth Lug) Power Transformer BX-125
(U.S.A. & Canada) Power Transformer BX-125
(Australia) & BX-125E Power Transformer BX-125
(Japan) Power Transformer BX-125
(Others) Cord Bushing C BX-125 (U.S.A.,
Australia, Others & Japan) & BX-125E (220V Class 2)
Cord Bushing 4K-4 BX-125 (Canada) & BX-125E (UK)
aA
Be we eB Bee Bp
a
13
Schematic Ref. No,
06
07
08 09
LO1 LO2
L03 L04
02
03
04
05
06
07
08 09
LO01
LO2
LO3 L04 LO5
Part No.
0B08533A
OB08504A 0B05241A 0B08219B 0B08348A 0B08093U
0J04622B
0OM04407A
0B07092U 0C01162B
OE03028A 0E03034A
OE00897A
0B08583A OEOO637A OE03031A
HA04764A HA04772A
HAO4766A
HA04792A HAO4765A HA04763A HAO4767A
0H04588A 0H04589A BAO5087A
(0B81001A) (0£00037A) 0B50040A
0B50009B
0B50011B
0B50010B
0B08037U
0B08351A
OB08533A
OB08504A OB05241A OB08219B 0B08348A 0B08093U
0J04601B
OM03948A
0B07092U 0C01162B
OE00921A
0E03034A
OEOO907A
OB08583A OE00637A 0E00818A
Description
Power Cord BX-125 (U.S.A. & Others)
Power Cord BX-125 (Canada) Power Cord BX-125 (Australia) Power Cord BX-125 (Japan) Power Cord BX-125E (UK) Power Cord BX-125E
(220V Class 2) Switch Cover BX-125 (U.S.A.,
Canada, Australia & Japan) & BX-125E
Voltage Lock Plate BX-125 (Others)
Voltage Selector BX-125 (Others) Bolt Receptacle Plate BX-125
(U.S.A. & Canada) BT 3x8 © Binding (Nickel) M4x8 © Binding (Nickel)
BX-125 (U.S.A. & Canada) ST 4x8 © Binding (Nickel)
BX-125 (Australia, Others & Japan) & BX-125E
Plastic Rivet Washer 3.3x7x0.5 M3x8 © Binding (Nickel)
BX-125 (Others)
Rear Panel Ass’y BX-125 (U.S.A.) Rear Panel Ass’*y BX-125
(Canada) Rear Panel Ass’y BX-125
(Australia) Rear Panel Ass’y BX-125 (Japan) Rear Panel Ass’y BX-125 (Others) Rear Panel Ass’y BX-125E (UK) Rear Panel Ass’y BX-125E
(220V Class 2) Serial No.: A32301001 - (Black)
Rear Panel BX-125 Rear Panel BX-125E 4P Pin Jack Ass’y (Consists of the
followings) (4P Pin Jack) (Earth Lug) Power Transformer BX-125
(U.S.A. & Canada) Power Transformer BX-125
(Australia) & BX-125E Power Transformer BX-125
(Japan) Power Transformer BX-125
(Others) Cord Bushing C BX-125 (U.S.A.,
Australia, Others & Japan) & BX-125E (220V Class 2)
Cord Bushing 4K-4 BX-125 (Canada) & BX-125E (UK)
Power Cord BX-125 (U.S.A. & Others)
Power Cord BX-125 (Canada) Power Cord BX-125 (Australia) Power Cord BX-125 (Japan) Power Cord BX-125E (UK) Power Cord BX-125E
(220V Class 2) Switch Cover BX-125 (U.S.A.,
Canada, Australia & Japan) & BX-125E
Voltage Lock Plate BX-125 (Others)
Voltage Selector BX-125 (Others) Bolt Receptacle Plate BX-125
(U.S.A. & Canada) BT 3x8 ® Binding
(Black Chromate) M4x8 @ Binding
(Black Chromate) BX-125 (U.S.A. & Canada)
ST 4x8 © Binding (Black Chromate) BX-125 (Australia, Others & Japan) & BX-125E
Plastic Rivet Washer 3.3x7x0.5 M3x8 © Binding (Black Chromate)
BX-125 (Others)
an
BP He BR Re Be RR
HB Ree
Nu NN NF FH
Br
tee
BH Ree ee Be LY
nv N NE eS
NR
Q'ty
wh
7. MOUNTING DIAGRAMS AND PARTS LIST
Notes: 1, Mounting diagram shows a dip side view of the printed circuit board.
2. Diode is 18853, 181555, or 1SS176 unless otherwise specified. 3. Following transistors are interchangeable with each other.
a. 2SA733, 2SA608SP, 2SA1048, 2SA1175:
b. 28C945, 2SC536SP, 28C 2458, 28C2785
4, Abbreviation for part name:
TR — Transistor, SiD — Silicon Diode, ZD — Zener Diode
RK — Carbon Resistor, RM — Metal Film Resistor, RF — Fail Safe Type Resistor
CE — Electrolytic Capacitor, CM — Mylar Capacitor, CC — Ceramic Capacitor, CP — PP Capacitor, CT — Tantalum Capacitor, CF — Film Capacitor, C — Mica Capacitor
7.1, Power Switch P.C.B. Ass’y
AC Input BLK to Power
Transtormer
to Power Transformer
Fig. 7.1
7.2, LED P.C.B. Ass’y
LED302 C-Type
Fig. 7.2
Schematic ; Schematic
meh me
BA05626A | Set P.C.B. Ass’y BX-125
Main P.C.B. Ass’y BX-125 LED P.C.B. Ass’y Dolby NR Switch P.C.B. Ass’y Tape Switch P.C.B.
BA05627A
BA05630A BA05635A
BA05637A Ass’y
BA05638A | Indicator P.C.B. i Ass’y
BA05639A | Volume P.C.B. Ass’y
BA05640A | Control Switch P.C.B. Ass’y
BA05641A | Timer Switch P.C.B. Ass’y
BA05626A-E/ Set P.C.B. Ass’y BX-125E
1 BA05627A-E| Main P.C.B. Ass’y : BX-125E i BA05630A | LED P.C.B. Ass’y
BA05635A | Dolby NR Switch P.C.B. Ass’y
BA05637A | Tape Switch P.C.B.
BA05638A Ass’y Indicator P.C.B.
BA05639A
BA05640A
Ass’y Volume P.C.B.
BAO5S641A
Ass’y Control Switch P.C.B. Ass’y Timer Switch P.C.B. Ass’y
LED302
7.3. Timer Switch P.C.B. Ass’y
7.4. Shut-off P.C.B. Ass’y
De pe
BA05230A | Power Switch P.C.B. Ass’y BX-125 (U.S.A. & Canada) Power Switch P.C.B. Ass’y BX-125 (Japan) Power Switch P.C.B. Ass’y BX-125 (Australia & Others) & BX-125E
Power Switch P.C.B. Power Switch Spark Killer BX-125 (U.S.A, & Canada) Spark Killer BX-125 (Japan) Spark Killer BX-125 (Australia & Others) & BX-125E Spark Killer Cover BX-125 (Australia & Others) & BX-125E
BA05231A
BA05229A
0B02573D 0B70002A 0B08342A
0B08363A
OB08445A
0B90059A
0J04763A | Power Switch Holder (1) M38x6 @ Pan (2A)
(2) (2)
LED P.C.B. Ass’y
0E00612A
0E00752A
BA05630A
Eyelet 2x3
OB60183A 0B06333A OB81065A 0B82116B
LED P.C.B. LED Red TLR124A Wire Mate 2P (1) Ribbon Cable 2P(1)
14
Fig. 7.3
“ie
Shut-dt Pulse
to Logic Port
tev
Fig. 7.4
Schematic Ref. No.
BAO5641A
OB60189A OBO9687A OBO7437A 0B81011A
CA80011A
O0C80047A OB06388A OB06389A
OB09840A OB09841A
Desuiption
Timer Switch P.C.B. Ass’y
Timer Svitch P.C.B. RK 2.7x 1/6WJ Slide Switcha 2-3
(1) Dip Mate4P
Shut-off ?.C.B. Ass’y
Shut-off ?.C.B. TR 2802812 Photo Reflector NJL5141 RK 680 Leadless RK 18K Leadless
7.5. Dolby NR Switch P.C.B. Ass’y
LOLOy is
7.7, Control Switch P.C.B. Ass’y
e a Bia,
1° Ob vaaci [' Ofioxiars2”
Fig.
15
7.6. Volume P.C.B. Ass’y
1.7
gees Reo 2204] :
501 S|
“WooP OHbO
Bed i o-——-o
| VM=26°°GNO;-W
0000-lo 6T ol ig 2 2 9) L9_949 9; W GND VM-25
Fig. 7.6
yt Omen: oe R701150
VR301 R341 R361,362 SW 305/306 FC1,MD1 DM1 FC20/21
LED301 Cds301
VR110,210 R501,601 C501,601 $W601,602 FC8 VM25/26 FC17/VP32 FC20
Q701
Q702
LED701 703,704
LED702 705,706
D701,702
c701 SW701-708
Q304 VR105,107
205,207 VR106,206 R138,238 R139,239
BA05635A
OB60187A
0B30036A 0B01682A OBO9677A 0B70027A 0B81010A
0B02349A
BA05639A
0B60186A 0B06333A 0B06325B
0B31002A 0B09733A 0B09282A 0B07462A 0B81011A
0B81012A 0B81002A
BA05640A
OB60188A
0B10026A
0B10039A
0B06334A
0B06333A
0B06181A OB06398A
OBO9657A OBO9667A OBO09663A 0B09693A OB09677A OBO9701A OBO5557A 0B70004A
0J04744A
BA05637A
0B60184A OBO6069A 0B32010A
0B32009A OB09653A OBO9695A
OBO9707A 0B09705A OB09263A OBO09831A OB09837A 0B09283A 0B09828A 0B01403A 0B41229A OBO5796A
OBO09187A 0B81051A 0B81011A
0B81012A 0B81010A OBO6688C 0B70005A
0J304768B
Dolby NR Switch P.C.B. Ass’y
Dolby NR Switch P.C.B. VR 10K (A)x2 RK 6.8K 1/4WJ RK 1K 1/6w J Push Switch 2-Key Dip Mate 3P (3)
JP Connector 4P (1)
Volume P.C.B. Ass’y
Volume P.C.B. LED Red TLR124A Photocoupler
MCD7214F Slide VR 100K (A) RK 220K 1/6W J cc 100P 50V K Push Switch Dip Mate 4P (2)
Dip Mate 5P (1) Dip Mate 2P (1)
Control Switch P.C.B. Ass’y
Control Switch P.C.B. TR 2SA933S
(Q,R,S) TR 2SC1740S
(S,E) LED Green
TLG124A LED Red TLR124A
SiD 18853 18S176
150 1/6WJ 390 1/6WJ 270 1/6w J 4,71K 1/6W J 1K 1/6W J 10K 1/6WJ 0.015u 50V J
Touch Switch 4.3mm
LED Reflector (6)
Tape Switch P.C.B. Ass’y
Tape Switch P.C.B. TR 2SB564 (L,M) Semi-fixed VR 47K
Semi-fixed VR 22K RK 10 1/6w J
1/6w J
1/6W J 1/6w J 1/4w J 1w Jd
10 1w J 220P 50V K 8200P 100V J 47 16V 1500P 100V J 0.047 50V J
1p 16V (BP) 2P-S Post ql) Dip Mate 4P (2)
Dip Mate 5P ql) Dip Mate 3P (1) Bias Ose. Unit (1) Push Switch eS
(1) Earth Plate A (1)
Schematic Ref. No.
IC301 1¢701 Q704 ZD701,702 D301,302 D703-706 R301 R302 R303 R304 R305-314
R701 R702,703 704,709 711,715
R705
FC18/19
ne ya
BAO5638A | Indicator P.C.B Ass’y
OB60185A | Indicator P.C.B. OBO06369A | IC TA7612AP 0B11031A | IC TLO92 0B06013A | TR 2SA733 (P,Q) OB06191A | ZD 2.7V RD2.7E 0B06181A | SiD 1SS53 OB06398A iD 1SS176 (4) 0B01888A 10K 1/4WJ 0B01887A : 1/4W J 0B01857A 1/4W J OB09797A 1/4W J OB09681A
OB09677A 0B09725A 1/6w J
0B09709A 1/6w J OBO9685A : 1/6W J OB09701A 1/6W J 0B09749A 1/6W J 0B09737A 1/6w J OBO9717A 1/6W J 0B09713A 1/6w J 0B09281A 150P 50V K OB09868A O.1u 50V J 0B09163A 10u 16V (BP) 0B81012A | Dip Mate 5P ql) 0B81011A | Dip Mate 4P (2) OB02356A | JP Connector 12P
ql)
16
7.8. Tape Switch P.C.B. Ass’y
7.9. Indicator P.C.B. Ass’y
Fig. 7.8
Fig. 7.9
: i i
7.10. Main P.C.B. Ass’y
t i
i
| eer 2 ee
|
{
|
“qtos ~RSG945.'U).,....
Paani emma
F402 2A 250VITIA 250)
Clze * 0-15 y SOVILN)
‘Hho
Fig. 7.10
17
Schematic b*] 7” Zz
Q101,102 201,202
Q103,203 ZD301
D304 L101,201 VR101,201 R101,201 R102,103 202.203
R104,204 R105,205 R106,206 R107,207 R108,208 R109,209 R110,210 R111,211 R112,212 R195,295 R319 R357 C102,202 €103,203 C104,204 C105,205 C106,206 C107.207 C108,208 C304 C307 RL301 CN1
BAO05627A
— PB Eq. Amp.
0B06142A | T
0B01872A | T 0B12168A | Z
0B01909A | SiD 0B03919C 0B32009A 0B09741A 0B09330A
OB05631A 0B09731A OB09685A 0B09711A 0B22307A OB22287A OB09673A 0B01888A 0B09703A OBO9677A OB01857A OB09725A 0B09137A | C OB09283A | CC 0B01403A | C 0B01863A | C 0B05832A | C 0B41002A (_C OB05550A | CM OBO9868A | C 0B01400A | C 0B90011A 0B02242A
1C303 Q104,204 L102,202 L103,203 R113,213 R114,214 R115,116
| 117,215 216,217
R118,218 R119,219 R120,220 R121,221 R122,222 R123,223 R125,225 R126,226 R153,253 110,210 111,211 112,212 C114,214 C115,215 C116,216 117,217 C126,226 C160,260 C161,261
1C305 Q112,212 VR102,202 VR103,104
203,204 R127,227 R128,228 R129,229 R130,230 R131,231 R132,135 137,232 235,237
R133,136 233,236
R134,234 R198,298
R
D RD10TS-T1B2 181555
Inductor 36mH Semi-fixed VR 22K RK RK
470K 100K
180K 2.2K 27K
680 10K 12K 1K
a Part No. Description
Main P.C.B. Ass’y
2SC2240 (BL)
R 2SC945L (P,Q) 10V
1/6W J 1/4w J
(Noiseless) 82 1/4
1/6w J 1/6w J 1/6wW J
4.87K 1/6W F 3.32K 1/6W F
1/6wW J 1/4w J 1/6W J 1/6W J 1/4W J 1K
100K 1/6wWJ E 22u 25V (LN)
220P 50V K E 47 16V E 3.34 50V
0.0184 50V J P 390P 100V J
1000P 50V J F 0.iy 50V J
— Rec. Eq, Amp. —
OBO06387A OB06299A OBO0068A OBO6696A 0B09711A OB09701A
OBO09677A | RK 0B09731A OBO9691A | RK OBO9665A OBO9669A 0B09715A | R OBO9697A | RK OB05936A | RK OB09741A | RK 0B01804A 0B40178A OB01862A | CE OBO5659A 0B41186A 0B01412A | CE OBO9866A | C OBO9815A OBO09280A OBO09187A
— Rec, Level —
0B11027A 0B01872A 0B32009A 0B32008A
0B09705A OB22327A OBO9699A OB01888A OBO9707A O0B09701A
OB05629A
OBO9677A 0B09709A
27K 10K 100K
1K 180K 3.9K 330 470 39K 6.8K 10 470K
15K
8.2K 10K 18K 10K
2.7K
1K 22K
100u 16V DS Relay 4P-T Post
IC NJM2043DD TR 2S8C2878 Trap Coil 10.5mH L-C Block RK RK
OB09725A | RK
1/6w J 1/6w J 1/6w J
1/6w J 1/6W J 1/6w J 1/6W J 1/6W J 1/6W J 1/6w J 1/4w J 1/6W J
8900P 50V J 0.47 50V 22u 16V 5600P 50V J 5100P 50V J 10u 16V 0.068u 50V J 47 6.3V (KS) 47P 50V J 1p 16V (BP)
IC TC9145P TR 2SC945L (P,Q) Semi-fixed VR 22K Semi-fixed VR 10K
1/6W J 7.15K 1/6W F
1/6wW J 1/4W J 1/6W J 1/6w J
1/4wW J
1/6W J 1/6W J
ig 355
C121,221 C122,222 C123,223
1C101,201 1C 102,202
OB09725A
OB05571A 0B05843A OBO5659A OB09993A 0B01913A
0B06383A OB06382A 0B10025A
ZD102,202 L104,204 L105,205 R154,193 254,293
R173,273 R174,274 R175,275 R176,276 R178,278 R180,280 R181,281 R182,282 R184,284 R185,285 R186,286 R187,190 287,290
R188,189 288,289
R191,291 R192,194 292,294
R196,296 R340
R358,359 R702,802 C132,134 232,234
C135,235 C136,236 C137,237 C138,140 154,238
C152,252 C153,253 C172,272
1C302 R152,252 R162,262 R163,263 C127,227 C129,229
Q105,106 205,206
30 VR108,208
OBO6167A OB06691A OBO6690A 0B05671A
OBO9687A OB09688A OBO9686A OB22286A 0B22229A 0B09721A 0B22309A OB22265A 0B22305A OBOST17A 0B09722A 0B09737A
0B09739A
OBO09796A OB09709A
0B09723A 0B09330A
OB09725A OBO1679A 0B09494A
0B09312A 0B09240A OBO5652A 0B01412A
OBO9280A OBO09864A OB09862A
OB09868A
OB09570A
OBO9866A 0B09872A 0B09189A OB05687A 0B40054A 0B09191A 0B01400A
— Line Amp.
OBO6146A OBO9677A OBO9709A 0B09702A 0B40076A 0B01412A
— Meter Amp
0B10039A
0B01872A 0B12101A OB06398A 0B06181A
0B32011A
18
— Dolby NR —
Ic Ic TR 2SC945L (PK)
ZD 6.2V RD6.2EB3
100K 1/6W J
680P 50V J 0.012u 50V J 5600P 50V J 820P 50V J 1800P 50V J
TEA0654 TEA0652
L-C Block Yellow L-C Block Blue RK
CF
2.2M 1/4W J
2.7K 3K 2.4K 3.3K 1K 68K 5.1K 2.2K 4.7K 47K 75K 330K
390K
12K 22K
1/6W J 1/6wW J 1/6W J 1/6W F 1/6W F 1/6w J 1/6W F 1/6W F 1/6W F 1/6W J 1/6w J 1/6w J
1/6w J
1/4W F 1/6w J
82K 1/6W J 100K 1/4W J (Noiseless) 100K 1/6W J 100 1/4WJ 1p 50V (LN)
0.01n 100V G 0.0334 100V G 4700P 50V J 10u 16V
47P 50V J 0.047u 50V J 0.033u 50V J
O.1u 50V J
CE 0.15u 50V (LN)
0.068u 50V J 0.22u 50V J 2700P 50V J 1200P 50V J 2200u 6.3V 4700P 100V G 100u 16V
NJM4558DD 1K 1/6w J 22K 1/6WJ 11K 1/6Wd 33u 16V 10pz 16V
2SC1740S (S,E) 2SC945L (P,Q) 65V 5C-1 1SS176 18853
Semi-fixed VR 100K | R633,636 637,640
— Logic —
OBO6178A 0B06214A 0B11020A
OBOG6069A 0B01872A
0B12100A 0B06181A
OBO6689A O0B32007A OBO09749A 0B09725A
O0B09701A
OBO9617A OBO5509A
OB09729A OBO09217A OB09737A OB09711A OBO9695A OBO9663A 0B09672A 0B01854A OBO09699A OBO6706A OBO1679A 0B01933A O0B24007A OBO97TO7A OB09741A
0B06370A OB06299A OBO9685A OBO9697A 0B09725A
OB05579A OBO9677A
0B09049A OB09327A 0B01398A 0B09291A 0B01400A
0B06013A
0B10021A 0B06372A
0B06322A
OBO6066A 0B10034A OB06398A
Ic
Ic
TR TR
TR
TR TR
TR
TR
SiD
Double SiD MC921 siD
33K 100K 560K 150K 100K
56K
22K 10 0.154 50V (LN) 10u 25V (LN) 100u16V
0.022u 50V Z
Ref-No. tee
0B09713A 0B01889A 0B09743A OB09729A OB09725A
OB09719A
OBO9709A OBO9216A OBO9570A OBO9148A 0B01400A
1/6w J 1/4w J 1/6W J 1/6w J 1/6W J
1/6W J
1/6W J 1/4wW J
1/6w J 1/6wW J 1/6w J
1/4W J 1/6w J
1004 16V
uPD4011BC uPD4071BC TMP4315BP- 1814 2SB564 (L,M) 2SC945L (P,Q)
28D1164 (K,L) 2SA953 (K,L)
2SC2002 (K,L)
2SD471 (L,M) 2SC1740S (E)
2SA733 (P,Q)
1SS176
18853
L-C Block Semi-fixed VR 470 RK 1M 1/6w J RK 100K 1/6W J
10K
3.3
150K 5.6 330K 27K 5.6K 270 620 39K 8.2K
R Coil 3.5 100 220
18K 470K
1/6w J
1/6w J 1/4w J
1/6W J 1/4w J 1/6W J 1/6w J 1/6w J 1/6w J 1/6w J 1/4w J 1/6W J
1/4W J 1/4W J 2w J 1/6w J 1/6w J
Schematic Ref. No.
R648 ,649 R652 R653 R654,655 R656 R657 R658 R659 R661
Part No.
OBO9677A
0B01889A 0B01846A 0B09733A 0B05629A OB09705A OB09693A OB09713A 0B09803A 0B09824A 0B09673A OBO09681A 0B24023A 0B01398A 0B01405A
0B40024A 0B01802A 0B09290A 0B40178A OBO09817A 0B02245A 0B02243A 0B81118A
10402 Q401,405 Q402,403 404
ZD401 ZD402 D401 D402 D403,404 406
R403 R404 R405 R406 R407 R408 R409 R410 R411
1K
RK
100K 1/4wJd 4.7K 1/4wJ 220K 1/6wW J 2.7K 1/4wJ 15K 1/6WJ 4.7K 1/6WJ 33K 1/6WJI
R-Network 47Kx5 R-Network 100Kx3 RK 680 1/6W J RK 1.5K 1/6WJ R Fuse 1
220u 16V ip 50V
0.33 50V
0.472 50V
9P-T Post 5P-T Post 2P-T Post
— DC Supply —
OB06380A 0B06322A 0B01872A
OBO6167A 0B06290A OB06282A 0B12100A OBO06398A
0B24006A OBO01857A OBO9671A 0B24007A OB09725A OBO97T07A OBO9695A OBO9665A OB09693A 0B09713A OB09719A 0B40095A 0B01392A 0B01403A OB09292A 0B09799A OB09798A 0B40076A 0B01405A 0B01398A OBO8715A 0B08676B OEOO507A 0E00612A
OEO0857A
— Miscellaneous —
0B60182A 0B81002A OB81010A OB81011A 0B81013A 0B81014A
Ic NJM7812 TR 2SC2002 (K,L) TR 2SC945L (P,Q)
ZD 6.2V RD6.2EB3 ZD 5.6V RD5.6EB2 Diode Bridge DBA10
2200P 50V J 0.01py 50V Z
33u 10V (KS)
Double SiD MC921 SiD 1SS176
560
56K
470u 16V 47g 16V
33u 16V lu 50V 220u 16V
O.1u 50V Z 4700u 25V 6800u 16V
Iw J 1/4W J
1/6W J 1000p 25V
Thermal Fuse 129 Heat Sink Nut Hex. M3
Main P.C.B. Dip Mate 2P Dip Mate 3P Dip Mate 4P Dip Mate 6P Dip Mate 7P
M3x6 @ Pan (2A) ql)
BT 3x6 © Binding (2)
1/6w J 'BAQ5627A-E| Main P.C.B. Ass’y BX-125E
1C305 Q112,212 VR102,202 VR103,104
203,204 R127,227 R128,228 R129,229 R130,230 R131,231 R132,135 137,232 235,237
R133,136 233,236
R198,298 R199,299 R354,355 356,363 364
C119,219 C120,220 C121,221 C122,222 C123,223 C199,299
0B11027A 0B01872A 0B32009A 0B32008A
OBO09705A OB22327A OBO9699A 0B01888A OBO9707A OBO9701A
OB05629A
OBO9709A OB09715A OB09725A
OBO5571A 0B05843A OBO5659A OB05687A 0B01913A OB05653A
— Rec, Level —
Contents of the list is the same as for BX-125 except the following section.
Ic TR
TC9145P 2SC945L (P,Q)
Semi-fixed VR 22K Semi-fixed VR 10K
15K 1/6WJ 7.15K 1/6W F 8.2K 1/6WJ 10K 1/4WJ 18K 1/6WJ 10K 1/6wJd
2.7K 1/4WJ
1/6W J 1/6w J 1/6W J
22K 39K 100K
680P 50V J 0.012u 50V J 5600P 50V J 1200P 50V J 1800P 50V J 1500P 50V J
8. SCHEMATIC DIAGRAM
8.1. IC Block Diagrams
voo AS B84 Y4 Y3 AZ B3
| Al 8! Y1 y2 Az 82 GND
(TOP VIEW)
Fig. 8.1.1 OR Gate C-MOS IC uPD4071BC
Voo A4 84 Ya Y3 AZ B3
Ai Bt Y1 Y2 Az Bz GNO
(TOP VIEW)
Fig. 8.1.2 NAND Gate C-MOS IC uPD4011BC
i Output A +V
Inverting Input A Output B
Non-Inverting Input A
—-Vv
Inverting Input B
Non- Inverting Input B
(TOP VIEW)
Fig. 8.1.3 Operational Amp. IC 4556D, NJM4558DD, NJM2043DD, TLO92
Fig. 8.1.4 Level Meter Driver TA7612AP
wo m r ne O
{Multiple Input Inhibition)
ae m o n
Input Circuit
Uo Sete
Fig. 8.1.5 Analog Switch Selector TC9145P
xOUT
Generctor
Instruction Decoder
1836 Word x@bit
le zlote je Sw [eo jz dele tee FS
(TG)
{10¢)
ROM
IN| O-3 INO 0-3 IN2 0-3
S2 BUS
RAM
64 Word
x 4 bit
INO O— 3: Input Port INO
IN10—3: Input Port IN1 |
100 0-3
IN2 0 — 3: Input Port IN2 OTO 0 — 3: Output Port OTO OT10—3: Output Port OT1 OT2 0 —3: Output Port OT2
OT3 0 — 2: Output Port OT3 100 0 — 3: Bidirectional Port 100 101 0 — 3: Bidirectional Port 101
RST RST: Reset INT: Interrupt
XIN, XOUT: Clock Terminals 101 0-3 arn
Fig. 8.1.6 4-Bit Micro-processor TMP4315BP-1814
19
8.2. Schematic Diagram DOLBY NR SWITCH P.C.B. = — es a Me: _ 7 A = MAIN P.C.B, SS Sw3o6
OV 6 +12v & 5 On R320 8 Fo~s 69 2 (yt
- 3 vasor aot VOKANA2
Output C-® -
Gy) =
C124 0618 SOV.
to Indicator P.CoBe 1C602: proso7iac (LNY RISE VRIO8
33 K 100K Rise 56K D102
c227 R262 Ho | 3 oe
cso TMP431SBP- 1814
100K 330K onte Zo101 Sov RIS4 150K 1Op 16v
MH-34 Flav Q- sez O- +i2v -
o ce +4 m *, ~
0.332 SOV FSS : fee Hi caso § RC4SS6D O ae 6 . 23 Headphone
R 1
nies ed 220nl6v 199 R265 o [R299 u L2mw/8o : R170 7 a R270 @mw/son
2omaks™ = So 2 i) = cd J J &
22K | LN)
Rec.+ Play | -6v |
[Rees # Prey | +12]
0404 Ip 50V
RIGS 100K
o
R27
(fer) fe fry] eae vP-32, = 4 7 ee ET cos oe 2
.
3 = z 1¢601 2 prOsoNAC +i2v +12v
J : f [
4 z y 8 e601 (2/4) 4
U
V ; 8
Tec. Mode i El a 2
3 t s é u
oh 10
tt = :
3, 2 5 sks Baa a 51s a 2 ae 5 3|- R52 . 2 ry Seo 3 3 sre Cas301 ° elec eTé e*c olay Poe
: ; get 2yts “ as : « c-
a :
;
e° 8 2 2 Ce hae +i2v 0603 28 ‘ goo 43 280733 sel : 2 Aso ax be ss es VOLUME PC.B.(I/2)
R6IG
tt mein : 4 os Comi2t
230945(L) 3
Camo) Ale} can 1C303: Nymz04300 © TPIO3 61 Rue
iis eoP) oatysov 1K cus © F 7 1p 16V
tS EP mo
hx = : BS 2 es! 3 s7e? 232 | o fe 7? aoe as eed zs] | 2 : I 32 gs8 . 4 2 ei8s my
Leh id ETco 5 a 3 | ®fo1s 10 7? Line Input 7) feos -_ ejoTs
> Cam(i)
EL SE EE PE TNE |
tezo3 L208 [RecJ-sv |
® Iie 7 | | eee R225 3 l
| ©) OOO et oa Fe-13, Or FC-9 LI
) @)
iT I es Sw6ol 1 Or
t 1 oP
oO ss oO
Rec
TIMER SWITC
Host isl = ron bo oe = O-OxX | a) oe ae ee
Ege Reh
‘AI33 267K
‘VRIO3 10K
ong 2scoasttr
Lehn (3)
Line Output
Reh (9) "100K
104 2sc2e7e
C261 cat
R228 C220
R220 C223 R237
C2t? R223 +4.5V
R230 YR202
Raz C24
Rio IDS
Len ® VW a Record /Playback dS Hy , Head oH} . 3] Bae to Indicator
Reh > , | 0 PeCoBe 4 aC) :
TP202 $6) rrioz
206 R208
a
Hi f a5 oe Ey Bee
saiT i 9 ite. z a eee | | :
: ¢ rarer : ba on [Mex] 120ys, 22 H A 2 sat, 2 g “" a8 al 3 if |" api Hoe an
eas J i O i mee R207 3 45 oy! | 3 6 3 3 4 i} é Z 2 baa 2° be 2 ? i t
Notes: 1. Diode is 18853, 181555, or 1SS176 unless otherwise specified. Fe Brak» swe soe re LL] 8 fe) Gel Ped fee] Ge) f=] FE) Ge) Gel Gel” ee] 2. 2SA733, 2SA608SP, 28A1048 and 2SA1175 are interchangeable with each other. To ROM IES OF Pearse ott nm CONTROL SWITCH PCB, 8. 2SC945, 2SC536SP, 2SC2458 and 2SC2785 are interchangeable with each other. 6 se 3 rome Sah] eae Ye] = _
4TK che 220p 1] Fig. 8.2
20 TAPE SWITCH PCB
SS oes LS,
to Indicator PoCoBe Tceo2: yPOSOTIBC
601 0.01n Reel Motor C602 0.01y Control Motor 28citeos Resz 6)
Real Cam Switch Operction 100K
3 C602: yPD4071IBC ae sv\ 34 moe 3 Ps 16602 (4/4) pea asez002
“Al : 2 : a) Com(2)
phone wen w/S50n I Comtt)
xtor Rew Mode Rec. Protector
ee g Counter "000"
Ams o 3 —— NS i ie 2eceooe §
eee 26ie Wemery 28733 Acew.
Aptay
Tree. oes Controt 2sc200z (eter)
: 2
+i2v a O 3
= Co 9603 asaras ely A Feoz corer SWITCH
g tox ar A — eo 100K
# y oe Q604 3
2sceasit) 3 ~6Vv
jot © I Cami) Op 16¥ ig s|
a R25 Ey tH fy ieev)
gs 6.8K 2 | = I $ | aa U.S.A., CANADA & JAPAN
<3 2 aa HLT acess sepa ness ( prex-i2s $s aige HHH ee: (Aastrotie) & 33 exiese
: "s ae 4 ll i Lo
mi2zi Cw. 330 656007) Oc
S101
Lioz (0.5m : a]
20 [rec] -6v | er, 7 fe lrev
R225 eg |
| © ; 12 oar) Orn ters ie
[Arts :
a 7 open TIMER SWITCH P.C.B,
FC-8
FC. ~~) ==
i
a m2zt cats
C2? Rees 2 i
(\) a
cas | ™
L202 c260 4
es tH
L
Clit a ‘
from Main PeCeBe
tes! TAT6IZAP VOLUME P.C.B.(2/2)
ae ae
coh ec ps ©®
Ba .C.B.
ee, ws Ww
ear 13
tcl ; Heh IE
Be ee oS ibis & Gi | fy ne |
Fig. 8.2
i trom Main P.C.B,,
“a
‘SWw707 sw
a7or z ‘25A9338; ?
a ree 100K
a R705
ys
?
LEO7OI R701 150
as Y | R708
Leoroz ZO [a
% LEo705
Lep706 0 705 tree sw7or oeiee
RTI 100K
ATI3 330K to Velume P.C.8. aay
Oe A eee
L. AUSTRALIA _|
AC Input
aS POWER SWITCH PC.B.
120V—<—"220V-240V OTHER VERSION
Warning: Parts marked with the symbol
istics, Use ONLY replacement parts recommended by the manu-
facturer. It is recommended that the unit be operated from a
suitable DC supply or batteries during initial check-out proce-
dure,
have critical character-
Caution: Before returning the unit to the customer, make sure you
make either (1) a leakage current check or (2) a line to
chassis resistance check. If the leakage current exceeds 0.5 milliamp, or if the resistance from chassis to either side of
the power cord is less than 240 k ohms, the unit is defective. WARNING — DO NOT return the unit to the customer until the problem is located and corrected.
9. WIRING DIAGRAM
Power
| Transformer
nput
| I
8LKk { to Main PCB! Assy l
! | I
Transformer
Transformer
Ll 220V CLASS 2 (220V)
Voltage Selector
Notes: 1 Table of wire colors
BRN — Brown BLU — Blue RED — Red VIO — Violet ORN — Orange GRY — Gray
YEL — Yellow WHT — White
GRN — Green BLK — Black
2. Component side view of the P.C.B. is illustrated unless otherwise specified.
3. Wire tube color is shown in (_ ).
pocccccccccccc ee
BLK AC Input
; 1 4 MM- 1
. Fc-8
GRY’ [V10_ |} WR
IGRY_Y REC
= CLLR wR
JERE us ee A AS
Power Switch P. C.B. Assy
U.S.A. & CANADA(120V) (JAPAN (I00V)) J
rz) Bey tl
: BLK a
oe foosse]s
Mechanism : : Record Protector
Eject Switch Switch
Shut-off P.C.B. Assy (Dip Side) =
Cam Switch
[990009]
WHT
GRY
GRN RED
' f
& oy
Capstan Motor
'
'
i) i]
Reel Motor
Timer Switch Tape Counter P.C.B. Assy Switch
a FC-
Erase Head Record/ Playback Head 7
ee o> ee |= i a mY)
i]
WHT (BLK} Pt RF
= Solana Display Unit Indicator P.C.t
Headphone P.C.B. Assy P
Jack é
Fig. 9
d > a= WHT (BLK)
Control Switch
P.C.B. Assy
BEEEREEEE re
g |o00000000
Main P-C.B. Assy
Tape Counter Switch
Display Unit
Fig. 9
Indicator P.C.B. Assy
Chassis
(BLK)
Volume PC.B.
Chassis
Dolby NR Switch PC.B.
WHT (GRY)
Chassis
WHT (GRY)
Pin Jack
Tape Switch PC.B. Assy
21
BLOCK DIAGRAMS 10.
Amplifier Section 10.1, P
(43uT
(aPO ‘MU 22) =
(usu)
NODE
avoysp day
!
‘dwy suoydpoay
(apo ‘Awoos?
and ing
aury ®
MA Inding
alow
INO Bd
uowras
sa19W
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e 7O21U0D
a4
284
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©
(7HOOt
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AwOoSE) (lO%d
1}
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<ore
te cp ec
ome 4
Pal o
& !
rae
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on
31 I
| fe
*
1299 8d
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}
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D3 ad I
|
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I 1
4 |
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| 21-MS
1
! ©
,inuos) 3
t 1
!
I 1
induy aury
: !
| L
4 .
pee x3
@
|
-—
BA 12A27
204 soos an
EL La
H
ae r
Tt it Ett
dt z)
Hoe
xz ©
[2404] |
wi
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(z0zd 1) © — -dwy
3
“204 409 “204
I qJ
CJ
| 20tdL
(eozaL) £OldL
| |
at PDaH
@S013 {
CD
[2se1} 440/879
wones UN
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@ o
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2 mn
NO
N
i} o
2HxSOL $
xdW
01499 "950 SDIG
w2s08 FF Pte
22
JOjOW UdISdDD
oz90
(%)
440 Jamog
(z)up9 a
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(4)wo9
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Aiddns
samo,
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30
[zemog]
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UOLIS0g
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Joos JOJOW J02)U0D
Serena raee (Sh Fee (0 Ceo) eer Yemen
| i | I | t { I | I I | } |
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JOJOW
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HO-INUS
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431408
asing
$0
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|
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|
sosuas
{
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Ho-
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LS
==4
|
[2aa]
\
et
:
4
i
G31
YouiMs
jou4u0D
_ a —
bse meee Lg Uoljaag
Wwsi
uoYo
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40$$890J0
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JO2}U0D
wWSIUDYyIay
£0991
a
dps
Mechanism Control Section 10.2,
Fig. 10.2
ie) N
11. TIMING CHART AND EQ. AMP. FREQUENCY RESPONSE
11.1. Timing Chart (1) Overall Timing Chart Playback Record
Mode
Stop Play Rec./Pause! Rec./Play Stop
Reel Motor : ee ee looms
(Tape) 440ms
Line Mute
( Output) 600ms
300ms —~
Bias
Rec. Mute 400ms
Fig. 11.1.1
(2) Mechanism Control Timing Chart
Control Button Play Pause Rec./Play Rew, FF. Play Tape End
y y
ose sion] ror | frou] [ree] [ree] oof e| fy [re] [sm FWD
Control Cam Motor
REV
ON Camto am{) OFF
Cam Position Cami!) ON
Switch OFF ——t
camiz) ON ome" OFF
eee FWD
Reel Motor
REV
Capstan Motor OFF
4) Fig. 11.1.2
24
11.2. Eq. Amp. Frequency Response
(1) Playback Frequency Response
GAIN (dB)
FREQUENCY (Hz}
Fig. 11.2.1
(2) Record Current Frequency Response
GAIN (dB)
FREQUENCY (Hz)
Fig, 11.2.2
25
12. SPECIFICATIONS
Track Configuration .......... 4 Tracks/2-Channel Stereo
Headss 2:5 gaat Pe eet Pha awed 2 (Erase Head x 1, Record/Playback Head x 1) Motors (Tape Transport) ....... DC Servo Motor (Capstan Drive) x 1
DC Motor (Reel Drive) x 1 Power Source...........---- 100, 120, 120/220-240, 220 or 240 V AC; 50/60 Hz
(According to country of sale)
Power Consumption .......... 23 W max.
Tape Speed ...........-.006% 1-7/8 ips. (4.8 cm/sec.) £0,5%
Wow and Flutter ............ Less than +0.11% WTD Peak
Less than 0.06% WTD RMS
Frequency Response .......... 20 Hz—20,000 Hz (recording level —20 dB) Signal to Noise Ratio. ......... Dolby C-Type NR on <70 us, ZX tape>
Better than 68 dB (400 Hz, 3% THD, IHF A-WTD RMS)
Dolby B-Type NR on <70 us, ZX Tape> Better than 62 dB (400 Hz, 3% THD, IHF A-WTD RMS)
Total Harmonic Distortion ...... Less than 1.0% (400 Hz, 0 dB, ZX, EXII tape) Less than 1.2% (400 Hz, 0 dB, SX tape)
Brasure ......... 00 eee eeee Better than 60 dB (100 Hz, 10 dB)
Separation. ...........2000- Better than 36 dB (1 kHz, 0 dB)
Crosstalk. 2... ee ee Better than 60 dB (1 kHz, 0 dB)
Bias Frequency ............. 105 kHz
Input (Line) ............... 50 mV, 30 kQ
Output (Line) .............. 0.5 V (400 Hz, 0 dB, output level control at max.) 2.2 kQ
(Headphones) ......... 2.2 mW (400 Hz, 0 dB, output level control at max.) 8 2 load
Fast-Winding Time ........... Approx. 85 seconds (with C-60 cassette) Dimensions ...............-- 430 (W) x 100 (H) x 250 (D) millimeters
16-15/16 (W) x 3-15/16 (H) x 9-7/8 (D) inches Approximate Weight .......... 5 kg
11 Ib.
@ Specifications and appearance design are subject to change for further improvement without notice. @ Noise Reduction System manufactured under license from Dolby Laboratories Licensing Corporation. @ The word ‘‘DOLBY” and the Double-D-Symbol are trademarks of Dolby Laboratories Licensing Corporation.
26
Service Manual
Nakamichi BX-125,BX-125E
Nakamichi Corporation Tokyo Office
Shinjuku Daiichi Seimei Bldg.
2-7-1 Nishishinjuku, Tokyo
Phone (08) 342-4461
Telex : 2324721 (NAKAM J)
Nakamichi U.S.A. Corporation ; 19701 South Vermont Avenue
Torrance, California 90502
Phone : (213) 538-8150
Nakamichi GmbH Stephanienstrasse 6, 4000 Diisseldorf 1
! Phone : (0211) 359036 0-850410A Printed in Japan