This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Colour Television Service Manual
Give complete "SERVICE REF. NO." for parts order orservicing, it is shown on the rating sheet on the cabinetback of the TV set.
NoteThis TV receiver will not work properly in foreign countrieswhere the television transmission system and power sourcediffer from the design specif ications. Refer to thespecifications for the design specifications
The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is speciallyconstructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube mustbe the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardousX-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to thisservice manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits,take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and highvoltage adjustment to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE
PRODUCT SPECIFICATIONS
Product safety should be considered when a component replacement is made in any area of a receiver.Components indicated by mark //!\ in the parts list and the schematic diagram designate components in whichsafety can be of special significance. It is particularly recommended that only parts designated on the parts list inthis manual be used for component replacement designated by mark /!\ . No deviations from resistance wattageor voltage ratings may be made for replacement items designated by mark /!\ .
1: An isolation transformer should be connected in thepower line between the receiver and the AC linewhen a service is performed on the primary of theconverter transformer of the set.
2: Comply with all caution and safety-related notesprovided on the cabinet back, inside the cabinet, onthe chassis or the picture tube.
3: When replacing a chassis in the cabinet, always becertain that all the protective devices are installedproperly, such as, control knobs, adjustment coversor shields, barriers, isolation resistor-capacitornetworks etc.Before returning any television to thecustomer, the service technician must be sure that itis completely safe to operate without danger ofelectrical shock.
Power source AC 220~240V 50HzTelevision system System B/GColour system PALReceiving channel VHF: E2-E12
CATV: X, Y, Z, S1-S41UHF: #21~69
Aerial input impedance 75ohmAV terminal21 Pin socket CENELEC standard
Sound output(Music) 12 watts X2Picture tube 63cm diagonal, 110 degree(Visible picture diagonal) 59cmDimensions (WxHxD) 680 x 543 x 446.5mmWeight 26 Kg
-3-EB4 MKII chassis
BLOCK DIAGRAM
This is a diagram for all models and therefore differs slightly from the actual block diagram.IC
801
CP
U21
P S
cart
: AV
121
P S
cart
: AV
2
IC20
1IF
/Vid
eo/C
hrom
a/D
ef.
IC12
02C
VB
S in
t/ext
sw
.IC
1201
CV
BS
AV
2 sw
.
CR
T U
nit
FB
T DY
IC00
1A
udio
Out
put
IC50
1V
ert.
Out
put
T61
1C
onve
rter
Tra
nsfo
rmer
Pow
er S
uppl
y C
ircui
t
SIF Unit
Audio Unit
Tun
er
IC80
2M
emor
y
47 49 50
SC
L
SD
A
RC
Pre
.am
p
6 5
51 52
IC81
0B
and
sw.
142417 18
2 3 4 5
2: B
right
3: C
ontr
anst
4: C
olou
r 5
: Sha
rpne
ss
Con
trol
Key
s10
VL
VH U IFTU
116 45
/46
28/2
9
30/3
1
4148371819207131521222324
X13
1S
AW
Filt
er
IC27
11H
Del
ayR
-Y/B
-Y
R-Y
/B-Y
CV
BS
In
Fun
ctui
n In
(AV
1/A
V2)
11/1
2
14/1
6
B G R BLK Ext
erna
l CV
BS
in
Inte
rnal
CV
BS
in
Q15
1Q
152/
Q15
4
H-D
rive
Q43
1
Q43
2H
-Out
pit
V-D
rive
V-F
eedb
ack
Aud
io In
Spe
aker
sV
R50
1
C51
2
H V
HV
Q26
01 Q26
11
Q26
21
Vid
eo In
Aud
io In
L
R
Q17
1
163
8 O
ut4
Out
27
Aud
io I/
OA
udio
I/O
Vid
eo I/
OV
ideo
I/O
RGB/BLK In
B1:
150
VB
2: 2
5VB
3: 1
5VB
4: 2
4V
IC65
1IC
652
B6:
12V
B8:
5V
L, R
L, R
1/ 5
10/ 8
AC
In
Q61
2Q
613
V-I
n
V-I
n
R G BCV
BS
In
AV1 I/O
SIF In
Aud
io O
ut L
, R
42
IC65
3
B6:
12V
B7:
8V
3D S
urro
und
Dec
oder
Nic
am &
Ste
reo
Dec
oder
AV2 I/O
Front In
Audio
-4-EB4 MKII chassis
1. POWER SUPPLYThe power supply circuit of the EB4-A chassis is
composed of a rectifier smoothing circuit, an oscillationcircuit, a control circuit and an output rectifier circuit. TheAC input voltage is full-wave rectified by the rectifiersmoothing circuit, and an unstable DC voltage isgenerated at both terminals of the smoothing capacitorC607. This voltage is input to the oscillation circuit. Theoscillation circuit is provided with a blocking oscillatorcircuit that switches the switching transistor Q613 ONand OFF, and an oscillation frequency and a duty squarewave pulse are generated in the input windingsaccording to operation of the control circuit. A square-wave pulse whose size is dependent on the turn ratio ofthe input and output windings is obtained in the outputwinding. This is rectified in the output rectifier circuit, andthe desired DC voltage is obtained.
2. IF & DEFLECTION (TDA8361)The IF output signal from the tuner passes through the
SAW filter, and it is input to pin45 and pin46 of IC201.The signal input to the IC passes through the IFamplifier, video detection and video amplifier circuits andis output from pin7 as a composite video signal. Andafter this signal is converted to impedance at Q151,supplies to the video and chroma amplifier stages. The sync.-separation circuit separates the video signalsapplied to pin13(internal video signal) or pin15(externalvideo signal) to vertical- and horizontal-sync. signalsrespectively. The horizontal oscillator requires noexternal components and is fully integrated. Theoscillator is always running when the start-pin36 issupplied with 8V. Horizontal drive signal is output frompin37. VR361 is for adjustment of the horizontal centring.The separated vertical-sync. signal from sync. separationcircuit passes through the vertical-separation circuit, andapplied to trigger divider circuit. The horizontal oscillationpulse and input vertical sync. pulse are monitored by thetrigger divider circuit, and switching 50Hz and 60Hzsystem, the vertical amplitude automatically adjusted for50Hz and 60Hz. The output signal from the triggerdivider is triggered vertical oscillation circuit consisting ofC351, R352 and pin42, and vertical drive pulse is outputfrom pin43. VR501 is for changing the amount of ACfeedback applied to pin41 and for adjustment of thevertical amplitude.
3. VIDEO CHROMA & R.G.B. (TDA8361)The composite video signal output from the pin7 of
IC101 passes through Q151-Q154, and it is supplied topin13. The external video signal output from SCART issupplied to pin15. The video signal input to pin13 orpin15 is separated to luminance (Y) signal and chromasignal in IC201. These pins are used in common withH/V-sync. separation input. The peaking of Y signal isadjusted by DC voltage of pin14. (“SHARPNESS”control) The chroma signal is divided into R-Y and B-Y
chroma signals, demodulated in IC201, and output frompin30 (R-Y) and pin31 (B-Y). These chroma signals passthrough the 1H delay line circuit (IC271), and they areinput to pin29 (R-Y) and pin28 (B-Y). These R-Y/B-Ysignals pass through RGB matrix circuit and RGBselector circuit of IC101. The internal RGB signals aregenerated in RGB matrix circuit and the RGB selector,consisting linear amplifiers, clamps and selects either theinternal RGB signals or the external RGB signals inputfrom pin22(R), pin23(G), pin24(B). Selection is controlledby the voltage at the RGB switch control (pin21) andmixed RGB modes are possible since RGB switching isfast. The RGB switch also functions as a fast blankingpin by blanking the RGB output stages; here internal andexternal RGB signals are overruled. The colour gain iscontrolled by DC voltage of pin26. (“COLOUR” control)The contrast control voltage present at pin25, and thebrightness control voltage present at pin17 controls DClevel of RGB signals. The RGB signals are finallybuffered before being available at the RGB output pins[pin20 (R), pin19 (G), pin18 (R)].
4. AUDIO OUTPUT(TDA7263M)The audio signals output from the audio unit are input to
pin1(L) and 5(R) of IC171 and passes through the pre-amplifier circuit and drive circuit, after which it is input tothe audio amplifier. The audio amplifier is an SEPP(single-ended, push-pull) OTL type and output to pin8(R)and 10(L) to directly drive the speakers.
5. VERTICAL OUTPUT (LA7832/LA7832)An IC (LA7832/LA7833) is used for the vertical output
circuit in this chassis. The vertical drive pulse from pin43of IC201 is input to pin4 of IC501. This pulse drivesIC501, and vertical scanning is performed. In the first halfof scanning a deflecting current is output from pin2 andpasses through the following path:Vcc(B4) D501 pin3 pin2 DY C512 VR501/R509. An electric charge is then stored in C512.In the last half of scanning the current path is C512 DY pin2 pin1 VR501/R509 C512. In this way,an amplifying sawtooth waveform current flows directly toDY to perform electron beam defection. Next, in the firsthalf of the banking period the vertical drive pulsesuddenly becomes OFF, and in order to reduce thecurrent flowing to DY, the current path becomes asfollows by the inductance of DY:DY pin2 pin1 VR501/R509 C512 DY. Also,when the charge of DY has dissipated, the current pathbecomes Vcc24V pin6 pin7 C502 pin3
pin2 DY C512 VR501/R509, and when theprescribed current value is reached, the vertical drivepulse becomes ON. This completes one cycle.
CIRCUIT DESCRIPTION
-5-EB4 MKII chassis
6. HORIZONTAL OUTPUTA horizontal oscillation signal is output from pin37 of
IC201 and switches the drive transistor Q431. Thisswitching signal is current amplif ied by the drivetransformer T431 and drives the output transistor Q432.When Q432 becomes ON, an amplifying current flowsdirectly to DY through C441 DY 0432 GND, anddefection is performed in the last half of the scanningperiod. Next, when Q432 becomes OFF, the charge thathad been stored in DY up to that point releases aresonance current to the resonant capacitors C421/C423and charges them. The current stored in C421/C423 isthen flowed back to DY, and an opposite charge is thenstored in DY. This opposite charge then switches thedumper diode in Q432 ON, the resonance state iscompleted, and an amplifying current is then flowedagain directly to DY through the dumper diode. By thismeans, deflection in the first half of the scanning periodis performed, and when Q432 becomes ON at the end ofthe first half of the scanning period, deflection during thelast half is begun, thus completing one cycle.
In the PCC circuit consisting of Q461 and Q462, theparabola signal supplied from the vertical circuit is addedat the horizontal output stage and pincushioncompensation is performed by varying the DC voltagebias. Further, the ABL voltage is feedback to the base ofQ462 to compensate for width variations due tovariations in the beam current.
7. CPU <System and Teletext Control>Pin description Pin1: Tuning voltage outputPin2: Brightness control output (6-bit DAC)Pin3: Contrast control output (6-bit DAC)Pin4: Colour control output (6-bit DAC)Pin5: Sharpness control output(6-bit DAC)Pin6: Not used (GND)Pin7: Not used (GND)Pin8: Power ON/OFF output (H:ON)Pin9: AFT signal inputPin10: Option SW1 & Keyboard scan input (DC)Pin11: Option SW2Pin12: 50/60Hz switch input (50Hz: Hi)Pin13: GNDPin14: TV/AV switch output (TV: Hi)Pin15: S-VHS switch output (S-VHS: Hi)Pin16: Option SW3 (2AV: Hi)Pin17: Function signal input for SCART1Pin18: Function signal input for SCART2Pin19: Power LED drive output1Pin20: Option SW4 & Power LED drive output2Pin21: Ignore outputPin22: GNDPin23: CVBS input0 (Internal)Pin24: CVBS input1 (Internal/External)
Pin25: BlackPin26: IREFPin27: Odd/Even outputPin28: GNDPin29: -Pin30: V-deflection stop outputPin31: RGB REFPin32: Blue output for OSDPin33: Green output for OSDPin34: Red output for OSDPin35: Blanking output for OSDPin36: H-sync. input (Horizontal pulse for OSD)Pin37: V-sync. input (Vertical pulse for OSD)Pin38~39: Supply (+5V)Pin 40: OSC GNDPin 41: Oscillator input for CPUPin 42: Oscillator output for CPUPin 43: Reset inputPin 44: Supply (+5V)Pin 45: Protect signal input (L:Power circuit defects)Pin 46: Ident. signal inputPin 47: R/C signal inputPin 48: Mute output in no picturePin 49: I2C bus SCL (Serial clock)Pin 50: I2C bus SDA (Serial date)Pin 51: Option SW5 & Band select output1Pin 52: Band select output2
-6-EB4 MKII chassis
CABINET DISASSEMBLY
CABINET BACK DISASSEMBLY
1. Remove 10 screws(A).2. Pull out the cabinet back.
PLACING THE CHASSIS TO SERVICEPOSITION
1. Pullout the chassis and put it to the rails on theside cabinet.
2. Fix main board with hook on the top rail.
(A)
(A)
(A)
(A)
(A) (A)
(A)
(A)
(A)
(A)
B1 POWER SUPPLY ADJUSTMENT1. Set VR641 to be mechanical centre before pressing
the main switch.2. Tune the receiver to PAL circular pattern.3. Set brightness and contrast controls to normal.4. Connect digital V-meter to test point "TP-B".5. By using VR641, adjust voltage to 150 ± 0.5 V.
AFT ADJUSTMENT1. Tune the receiver to the clearest station. 2. By using T141, adjust AFT to obtain the best picture.
AGC ADJUSTMENTNOTE: Do not attempt this adjustment with weaksignal.1. Tune the receiver to the clearest station.2. Set AGC VR(VR131) in direction which causes snow
noise to appear, then in the opposite direction untilsnow noise just disappears.
GREY SCALE ADJUSTMENT
[SCREEN VR ADJUSTMENT]1. Tune the receiver to the white pattern.2. Set brightness and contrast controls to normal.3. Set VR602and VR612 to be mechanical centre.4. Turn VR601, VR611 and VR621 fully counter-
clockwise.
5. Set mode to one horizontal scanning line, how to setrefer to "service mode"
6. Set screen VR for one colour to be just visible.[BIAS VR ADJUSTMENT]7. By using VR601, VR611 or VR621, adjust line to be
white.8. Set screen mode OFF, how to set refer to "service
mode"[DRIVE VR ADJUSTMENT]9. By using VR602 and VR612, adjust white balance.
HIGH VOLTAGE & WIDTH ADJUSTMENT[HIGH VOLTAGE ADJUSTMENT]1. Tune the receiver to circular pattern.2. Set brightness and contrast controls to maximum.3. Connect digital V-meter to both terminals of R224, and
high voltage meter to CRT anode.4. Confirm high voltage to be 26.0 ± 1 KV at beam
current 1.3, and less than29.0 KV at 0 beam current.
[H-WIDTH ADJUSTMENT]5. Adjust VR462 to obtain
proper H- width.6. Reconfirm high voltage.
H-CENTRE ADJUSTMENT1. Tune the receiver to circularpattern.2. Adjust H-centre by using
VR361.
V-CENTRE ADJUSTMENT1. Tune the receiver to circular pattern.2. Adjust V-centre by using SW501.
V-SIZE ADJUSTMENT1. Tune the receiver to circular pattern.2. Adjust V-size by using VR501.
FOCUS ADJUSTMENTBy using FOCUS VR, adjust focus control for goodscanning lines.
CAPACITORC2601 403 074 5702 CERAMIC 560P K 50VC2611 403 074 5702 CERAMIC 560P K 50VC2621 403 074 5702 CERAMIC 560P K 50VC2631 403 077 2708 CERAMIC 1000P P 2KC2635 403 055 8401 ELECT 22U M 250V
403 260 0405 ELECT 22U M 250VC2651 403 201 5001 ELECT 330U M 16V
!
!
!
Ref. No. Part No. Description Ref. No. Part No. Description
CHASSIS ELECTRICAL PARTS LIST
Note: Parts order must contain Service Ref. No., Part No., and descriptions.
Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by a mark in this parts list and the circuit diagram show compone nts whose value havespecial significance to product safety. It is particularly recommended that only parts specified on the following partslist be used for components replacement pointed out by the mark.
!
Read description in the Capacitor and Resistor as follows:
Ref. No. Part No. Description Ref. No. Part No. Description
-20-F7PZJ
Part No. SKP20194 F7PZJ (SHEET 1/2)
COLOUR TELEVISION
EEEEBBBB4444MMMMKKKKIIII IIII
SERVICE REF.NO.
MODEL NUMBER
CHASSIS SERIES
CE25DN3-H-06
CE25DN3-H
The service Precaution:The area enclosed by this line ( ) is directly connected withAC mains voltage. When servicing thearea, connect an isolating transformerbetween TV receiver and AC line toeliminate hazard of electric shock.
NOTIZIE SULLA SICUREZZA DI FUN-ZIONAMENTOOgni sotituzione di componenti va fattatenendo conto della sicurezza di funzion-amento. I componenti indicati solloschema con il simbolo /!\ hanno partico-lare importanza per il sicuro funziona-mento del TV.I suddetti componenti devono esseresostituti esclusivamente con quelli indi-cati nell'elenco.
PRECAUZIONE DI SERVIZIOL'area inclusa in questa linea ( )è collegata direttamente con la tensionedella rete CA quando si serve l'area col-legare un trasformatore isolante tra ilricevitore TV e la linea CA per eliminareil pericolo di scossa elettrica.
Product safety notice:Product safety should be consideredwhen a component replacement ismade in any area of a receiver.Components indicated by a mark /!\ inthis circuit diagram show componentswhose values have special signifi-cance to product safety. It is particu-larly recommended that only partsspecified on the part service manualbe used for components replacementpointed out by the mark.
Note sul diagramma di circuito :1. Tutte i valori di resistenza sono in ohm,K=1,000, M=1,000,000.2. Tutte le resistenze nominali watt sono di
1/6 a meno che sia specificato altrimenti.3. Eccetto per i condensatori elettrolitici, tutti i
valori di capacitanza di meno di sonoespressi in µF, e di piu di 1 sono in pF. Ivaroli di capacitanza elettrolitici sono in µF.
4. Tutti volt di capacitanza nominali sono di50V a meno cha sia indicato altrimenti.
5. Tutti valori di inductanza sono in µH.6. I valori letti del voltaggio presi con un
"VTVM" proven gono dal punto indicatosulla massa del chassis, i valori di voltag-gio presi usando un segnale di barre col-ore sono con tutti i controlli alle loroposizioni normali ed il commutatore AFCin posizione "OFF". Il voltaggio puo variarecon l'intensita del segnale.
7. Le forme di onda furono prese con il seg-
nale di barre colore e i controlli regolatioppure le forme di onda di immagine nor-male furono prese usando un oscillatore alarga banda ed una sonda bassa capasità.
8. Rispetto a quando indicato su questoschema possono essere state introdottedelle modifiche.
9. I diodo 1S1555 possono essere sostitutticon 1S2473, 1S2076 oppure DS472 ameno che sia specificato altrimenti.
I transistori possono essere sostitutti con2SC536(Q,R,S), 2SC1740(Q,R,S),2SC945A(Q,R,P) oppure2SC1815(G,O,Y) a meno che sia speci-ficato altrimenti.
Il transistore 2SA608(E,F) puo esseresostituito con 2SA933(Q,R),2SA564(QA,RA), oppure 2SA1015(O,Y)a meno che sia specificato altrimenti.
Circuit diagram notes :1. All resistance values are in ohms,
K=1,000, M=1,000,000.2. All resistance rated wattages are 1/6W
unless otherwise noted.3. Excepting electrolytic capacitors, all
capacitance values of less than 1 areexpressed in µF and more than 1 are pF.
4. All capacitance rated voltages are 50Vunless otherwise noted.
5. All inductance values are in µH.6. Voltage readings taken a digital voltmeter
are from point indicated chassis ground.Voltage readings taken by using a colourbar signal are with all controls at normalposition. Some voltages may vary withsignal strength.
7. Waveforms were taken with colour barand controls adjusted for normal picture.Waveforms were taken by using a wideband oscilloscope and a low capacityprobe.
Audio Board /Pannello AudioComponent Location/Lato del Componente
IC1251
IC3401
IC3451
IC3431
K34A K34BT3401
IC3811
IC3801
K38H2 K38H1
SIF Board /Pannello SIFCircuit side/Lato del Circuito
SIF Board /Pannello SIFComponent Location/Lato del Componente
8. This circuit diagram covers a basic or rep-resentative chassis only. There may besome components or partial circuit differ-ences between the actual chassis and thecircuit diagram.
9. Diode 1S1555 may be replaced with1S2473, 1S2076 or DS472 unless oth-erwise noted.
CRT Board /Pannello CinescopioComponent Location/Lato del Componente
K38H26 4 1
J3807
C3811
C3813
C3815
C3814
X3811
X3813
T3801J3803
X3815
X3812
J3806
J3802
K38H1
X3814J3810
J3805
C3812
R3815
R3846
J3812 Q3841 C3842
J3841
C3806
R3844
Q3831
R3841
R3841
R3841
Q3831
J3831
Q3802
Q38
42
R38
48 R38
49
R38
31
R38
34 C38
32
C38
33
C38
33R
3806
R38
06
R38
04Q
3801
R38
03
R38
05
R38
02C
3802
C38
03
C38
06C
3804
C38
09
R38
32R
3833
16
16 1 1
8 7 81
R38
45
C38
16
J381
1R
3842
C38
41R
3841
R38
35
C38
34
C38
31R
3807
R38
43
C38
43
J384
2
J380
1
X38
01
X38
01
X38
01
C38
05
R38
13
IC38
01
9 8
16
1
4 1
C3842
C3842
C3842
Circuit side/Lato del Circuito
Main Board /Pannello PrincipalCircuit side/Lato del Circuito
SW
601
Mai
n sw
itch
F60
1F
use
Q61
1
T61
1C
onve
rter
Tra
nsfo
rmer
TP
-B
VR
462
H-W
idth
Q46
1
Q46
2
T45
1F
lyba
ckT
rans
form
er
Q61
2
Q61
3
T48
1R
C T
rans
form
er
D61
5P
hoto
-cou
pler
SW1901Prog.+
SW1902Prog.-
SW1903Vol.+
SW1904Vol.-
Q64
1
VR
641
+B
AD
J.Q
681
Q50
1
Q43
2H
-Out
put
IC50
1V
-Out
out
IC65
1+
12V
R224
J213
Scart 2
SW
501
V-C
entr
e
VR
501
V-S
ize
IC27
11H
Del
ayIC
652
+8V
Scart 1
IC201IF/Video/Croma/Def.
IC28
1
VR
361
H-C
entr
e
VR
131
AG
C
T10
1T
102
VC
141
T14
1
IC81
0 B
and
SW
.A
udio
Boa
rd
SIF
Boa
rd
A10
1 T
uner
IC12
02In
t./E
xt. S
W.
IC12
01A
V2
SW
.
TP
-ET
P-D
IC80
2M
emor
y
IC801CPU
IC00
1A
udio
-out
put
IC801CPU
21P Scart: AV1 21P Scart: AV2
IC201IF/Video/Chroma/Def.
IC1202CVBS int/ext sw.
IC1201CVBS AV2 sw.
CRT Unit
FBT
DY
IC001Audio Output
IC501Vert. Output
T611Converter Transformer
Power Supply Circuit
SIF
Unit
Audio U
nit
Tuner
IC802Memory
47
49
50
SCL
SDA
RC Pre.amp
6
5
51
52
IC810Band sw.
14
24
1718
2345
2: Bright 3: Contranst4: Colour 5: Sharpness
Control Keys10
VL
VH
U
IF
TU
116
45/46
28/29
30/31
41 4837
18
19
20
7
13
15
2122
23
24
X131SAW Filter
IC2711H Delay
R-Y/B-Y
R-Y/B-Y
CVBS In
Functuin In(AV1/AV2)
11/12
14/16
B
G
R
BLK
External CVBS in
Internal CVBS in
Q151 Q152/Q154
H-DriveQ431
Q432H-Outpit
V-Drive
V-Feedback
Audio In
Speakers VR501
C512
H
V
HV
Q2601
Q2611
Q2621
Video InAudio InL R
Q171
1
63
8 Out4 Out
27
Audio I/O Audio I/OVideo I/O Video I/O
RG
B/B
LK In
B1: 150VB2: 25VB3: 15VB4: 24V
IC651IC652
B6: 12V
B8: 5V
L, R L, R
1/ 5 10/ 8
AC In
Q612 Q613
V-In
V-In
R
G
B
CVBS In
AV
1 I/O
SIF
In
Audio Out L, R
4 2
IC653
B6: 12V
B7: 8V
3D SurroundDecoder
Nicam & Stereo Decoder
AV
2 I/O
Front In
Audio
REGOLAZIONE DELL’ALIMENTATORE B11. Regolare VR641 in modo che sia centro meccanico, prima
di premere l’interruttore principale.2. Sintonizzare il ricevitore sull’oscillogramma circolare PAL.3. Regolare i comandi di luminosità e contrasto sui livelli
normali.4. Collegare il misuratore V digitale su “TP-B”.5. Servendosi di VR641, regolare il voltaggio su 130 ± 0,5 V
(per 21 pollici).Servendosi di VR641, regolare il voltaggio su 150 ± 0,5 V(per 25/28 pollici).
REGOLAZIONE AFT1. Sintonizzare il ricevitore sulla stazione più chiara.2. Servendosi di T141, regolare AFT per ottenere l’immagine
migliore.
REGOLAZIONE AGCNOTA: Non tentare questa regolazione con un segnale
debole.1. Sintonizzare il ricevitore sulla stazione più chiara.2. Regolare AGC VR(VR131) nella direzione in cui appaiono i
disturbi da neve, quindi regolare in direzione opposta nelpunto esatto in cui i disturbi da neve scompaiono.
REGOLAZIONE DELLA SCALA DEI GRIGI[REGOLAZIONE VR DI SCHERMO]1. Sintonizzare il ricevitore sull’oscillogramma bianco.2. Regolare il comando della luminosità su centro display e
quello del contrasto su normale.3. Regolare VR602 e VR612 in modo che sia centro
meccanico.4. Ruotare fino in fondo, in senso antiorario VR601, VR611 o
VR621.5. Quando si tiene premuto il pusante tasto “Funzione” (sul
telecommando) e contemporaneameante si preme ilpusante P (sul televisore) apparivanno le seguentiindicazioni sullo schermo.
6. Premere il tasto “Funzione” (sul televisore) per selezione lafunzione “SCREEN”.
8. Regolare VR di schermo per un solo colore in modo che siaben visibile.
[REGOLAZIONE VR DEL BIAS (POLARIZZAZIONE)]7. Servendosi di VR601, VR611 o VR621, regolare la linea in
modo che sia bianca.9. Per tornare al modo di funzionament TV, premere il tasto
Richiamo.
[REGOLAZIONE VR DEL DRIVE (ECCITAZIONE)]9. Servendosi di VR602 e VR612, regolare il bilanciamento del
bianco.
REGOLAZIONE DI ALTO VOLTAGGIO E DIAMPIEZZA
[REGOLAZIONE DI ALTO VOLTAGGIO]1. Sintonizzare il ricevitore sull’oscillogramma circolare PAL.2. Regolare i comandi di luminosità e contrasto sui livelli
massimi.3. Collegare il misuratore V digitale su entrambi i terminali di
R224 (lato sinistro) (+), e il misuratore di alto voltaggiosull’anodo CRT.
4. Confermare che l’alto voltaggio sia 26,0 ± 1 KV alla correntedi fascio di elettroni 1,3, e meno di 28,0 KV alla corrente difascio di elettroni 0 (per 21 pollici).Confermare che l’alto voltaggio sia 26,0 ± 1 KV alla correntedi fascio di elettroni 1,3, e meno di 29,0 KV alla corrente difascio di elettroni 0 (per 25 pollici).Confermare che l’alto voltaggio sia 26,0 ± 1 KV alla correntedi fascio di elettroni 1,4, e meno di 29,0 KV alla corrente difascio di elettroni 0 (per 28 pollici).
[REGOLAZIONE DI AMPIEZZA-H]5. Se l’ampiezza H è troppo larga o troppo stretta, collegare o
scollegare un filo in piombo J213 (per 21 pollici).Regolare VR462 per ottenere l’ampiezza H appropriata (per25/28 pollici).
6. Riconfermare l’alto voltaggio.
REGOLAZIONE DI CENTRO-H1. Sintonizzare il ricevitore sull’oscillogramma circolare.2. Regolare il centro-H servendosi di VR361.
REGOLAZIONE DI CENTRO-V1. Sintonizzare il ricevitore sull’oscillogramma circolare.2. Regolare il centro-V servendosi di SW501.
REGOLAZIONE DELLA DIMENSIONE-V1. Sintonizzare il ricevitore sull’oscillogramma circolare.2. Regolare la dimensione-V servendosi di VR501.
REGOLAZIONE DELLA MESSA A FUOCOServendosi di FOCUS VR, regolare il controllo della messa afuoco per una buona scansione delle linee.
REGOLAZIONI DI SERVIZIO TECNICO
ADJUST DATASYSTEM +000SCREEN VOLCPU MK2 1.0
ADJUST DATASYSTEM +000SCREEN VOLCPU MK2 1.0
+- P
F
SCREEN VOL
F
+Per regolar il livelli, premere il tasto livello.7.
DC 15.5VTensione AGC (4.3-4.5V)Sonda di uscita
Sonda di ingresso
Marker frequencySweep ATT
0dB=176mVrms/75
IMPOSTAZIONE
C644 +IC201-pin48IC201-pin45(Side b)IC201-pin7
38.9MHz20dB
Regolazione
Servendosi di T141, regolare"P" in modo che sia diampiezza massima.
Forma d’onda VIF
ALLINEAMENTO DI CIRCUITO
Allineamento VIF
0.002µF
75Ω1kΩ
a
b
10kΩ
Sonda di ingresso Sonda di uscita
Allineamento SIF
DC 12VTensione AGCSonda di uscita
Sonda di ingressoATT di deflessioneFrequenza segnalatoreTool-A