MICROFILM US Model SPECIFICATIONS SERVICE MANUAL FM STEREO/FM-AM RECEIVER STR-V220 — Continued on next page —
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– 1 –
MICROFILM
US Model
SPECIFICATIONS
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
STR-V220
— Continued on next page —
STR-V220
– 7 – – 8 –
4-2. SCHEMATIC DIAGRAM – MAIN (1/3) SECTION –• See page 6 for Waveforms.• See page 13 for Printed Wiring Board.• See page 23 for IC Block Diagrams.
(Page 19)
(Page 11)
(Page 11)
(Page 17)
STR-V220
– 9 – – 10 –
4-3. SCHEMATIC DIAGRAM – MAIN (2/3) SECTION –• See page 13 for Printed Wiring Board.
(Page 11)
(Page 20)
STR-V220
– 11 – – 12 –
4-4. SCHEMATIC DIAGRAM – MAIN (3/3) SECTION –• See page 24 for IC Block Diagrams.
(Page 9, 10)
(Page 8)
(Page 8)
STR-V220
– 17 – – 18 –
4-7. SCHEMATIC DIAGRAM – DISPLAY SECTION –• See page 6 for Waveforms.• See page 25 for IC Block Diagrams.• See page 26 for IC Pin Function.
(Page 7)
(Page 19)
(Page 20)
(Page 20)
STR-V220
– 19 – – 20 –
4-8. SCHEMATIC DIAGRAM – PANEL SECTION –
(Page 17)
(Page 8) (Page 9)
(Page 18)
(Page 18)
STR-V220
– 23 – – 24 –
4-10. IC BLOCK DIAGRAMS• Main section
IC301 LV1035M
STRIM
OSC
VOL
VOL
VCA VCAA
B
A
B
VCA VCA
VCA VCA VCA VCA
DEVNOISEGEN
NOISEFILTER
BPFCONTROL
CHCONTROL
BPF
V REF
STRIM
SMODE
RECT
RECT
DCCUT
B NR
OUTFILTER
DATADECODERVOL/
MUTE
BPF
RECT
LOGICFF
LOGICFF RECT
C MODE
LOGIC LOGIC
S
S
S
A A S
B
B B
A
B
CB
LR
A A
A
B
A
B
A
BA
B
A
B
S
VDD
PCM
PCMCONTROL
SRAM
INFILTER
R
L
C
S
R
A
B
A
B
AB
ABL
L
R
L
R
R BPF2
R BPF1
S DC OUTC DC OUTR DC OUTL DC OUT
V REFVCC
C OUT
S OUT
R OUT
L OUT
GND
L IN
R IN
S IN
DELA
Y OU
T
L BPF2
L BPF1
RT IN
LT IN
DC CUT
C MODE
GNDNS BPF1
OSC
NS BPF2
ENABLE
DATA
CLK
DATACLK
VSS
OSC
OSC
VDD
A/DNSD/A
DC C
UT
DC C
UTVCC
DET
IREF
GND
S-OU
T
R-OU
T
L-OU
T
L RE
CT
DC C
UT4
R RE
CT
DC C
UT3
L BP
F3
VLR
TH
VLR
1
VLR
2
VCS
2
VCS
1
VCS
TH
L+R
RECT
DC C
UT2
L-R
RECT
DC C
UT1
R BP
F3
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
48
47
46
45
44
43
4140
39
38
37
36
3534
33
1817
16
15
14
13
12
11
10
9
7
3456
1
2
8
19 20 21 22 23 24 25 26 27 28 29 30 31 32
42
IC401 LC7822
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
CONT
ROL LATCH
SHIFT RESISTOR
LEVEL SHIFT
CL
DI
CE
VEE
OUT
IN
OUT
IN
OUT
IN
VSS
S
RESET
VDD
OUT
ININ
OUT
IN
OUT
IN
IC950 NJM2103D
1
2
3
4 5
6
7
8
V+
VSB/SESIN
VSA
RESET
GND
OUTC
VSC
CR
VREF
+ –
– +
–+–+
Q
R S
IC501 LA1838
ALC
BUFF
AMOSC
AMMIX
AMRF. AMP
AGC
IF DET
S-CURVE
AM/FMIF
BUFF
REG
TUNINGDRIVE
GND VCC
PILOTDET
VCO
FF
STEREODRIVE
STEREOSW
MUTE
FF FF
FMIF
FMDET
DECODERANTI BIRDIE
1 2 3 4 5 6 7 98
20 19 18 17 16
15141110
212223242527 262930
OSC.
BUFF
FM-S
D.AD
J
AM-O
SC
REG
FM-A
FC
AM-R
F-IN
AGC
MPX
-IN
FM-D
ET O
UT
AM-D
ET O
UT
OUT
L
OUT
R
AMP-
IN L
AMP-
IN R
AMP
OUT
R
AMP
OUT
L
VCO-
STOP
STER
EO
AM/F
M
AM. S
D
FM. S
D
AM. S
D AD
J
IF-B
UFF
MUT
E
VCC
FM D
ET
FM-IN
AM-M
IXFM
-IF
AM-IF
GND
TUNE
D
S METERFM S METER
AM
COMPSD
AM
12 13
PHASEDET
28
– 25 –
• Display section
IC202 BA6208
1 2 3 4 5 6 7 8 9
NC
OUTP
UT 2
Vcc
GND
NC
INPU
T 2
INPU
T 1
NC
MOTORDRIVE
MOTORDRIVE
REG
SWITCH
SWITCH
OUTP
UT1
IC502 LC72131
PHASEDETECTOR
CHARGE PUMP
SWALLOW COUNTER1/16, 1/17 4BITS
12BITSPROGRAMMABLE
DIVIDER
UNIVERSALCOUNTER
REFERENCEDIVIDER
POWERON
RESET1/2
C2BI/F
1 3 4 5 6 8 10 11
18 17 16 15 12
13
19202122
XOUT
VSS
AOUT
AIN
PD VDD
FMIN
AMIN
XIN
D OU
TS
CLK
S DA
TACE
IFIN
I/O IN
I/O IN
MON
OFM
/AM
UNLOCKDETECTOR
DATA SHIFT REGISTER LATCH
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