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STR-V220
SERVICE MANUAL
US Model
SPECIFICATIONS
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FM STEREO/FM-AM RECEIVER
MICROFILM
1
STR-V220
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)
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8
STR-V220
4-3. SCHEMATIC DIAGRAM MAIN (2/3) SECTION · See page 13 for Printed Wiring Board.
(Page 20)
(Page 11)
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STR-V220
4-4. SCHEMATIC DIAGRAM MAIN (3/3) SECTION · See page 24 for IC Block Diagrams.
(Page 9, 10)
(Page 8)
(Page 8)
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STR-V220
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 20)
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(Page 7)
(Page 19)
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STR-V220
4-8. SCHEMATIC DIAGRAM PANEL SECTION
(Page 18) (Page 17)
(Page 18)
(Page 8)
(Page 9)
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STR-V220
4-10. IC BLOCK DIAGRAMS
· Main section IC301 LV1035M
L+R RECT L-R RECT DC CUT4 DC CUT1 DC CUT2 VLR TH R BPF3 DC CUT3 IN L BPF3 VCS TH VCS 1 VLR 2 VLR 1 L RECT R RECT VCS 2
IC401 LC7822
IC950 NJM2103D
1 2 3 OUT 48 L BPF2 IN 4 5 6 7 OUT 8 9 IN 10 OUT VCA VCA VCA VCA VEE A B VCA VCA VCA VCA A B CH CONTROL 44 DC CUT VOL R 46 RT IN 11 12 LEVEL SHIFT
30 29 IN 28 27 OUT 26
CR
1
8
RESET
64 63 62 R BPF2 1
61 RECT
60
59
58
57
56
55
54
53
52 RECT
51
50
49
+ VSC 2 + VREF 7 VSA
25 IN 24 23 OUT 22 IN 21 20 OUT 19 VDD
R BPF1 2
BPF
RECT
LOGIC FF LOGIC LOGIC
LOGIC FF
RECT
BPF
47 L BPF1
OUTC
3
6
VSB/SESIN
GND
4 Q R S + +
5
V+
DI
CONTROL
CE 13 14
LATCH
18 RESET 17 S
S DC OUT 3 C DC OUT 4 R DC OUT 5 L DC OUT 6
CL 15 VOL L 45 LT IN
SHIFT RESISTOR
16 VSS
IC501 LA1838
AM-DET OUT FM-DET OUT AMP OUT R AMP OUT L OSC.BUFF FM-SD.ADJ AMP-IN R AM-RF-IN AMP-IN L
V REF 7 VCC 8 C OUT 9
V REF
S MODE STRIM C MODE
BPF CONTROL 43 42 41 40 OSC C MODE GND NS BPF1 NS BPF2
AM-OSC
MPX-IN
FM-AFC
C S
NOISE FILTER
S OUT 10
30
29
28 REG
27
26
25
24
23
22
21
20
OUT R
OUT L
AGC
REG
19
18
17 16
39 OSC ALC AM OSC AM MIX AM RF. AMP AGC STEREO DRIVE AM IF AM/FM IF BUFF MUTE DET AM S METER TUNING DRIVE GND 35 DATA 34 CLK 33 VSS 1
FM-IN
A R OUT 11 R B A L OUT 12 L B
R
A B A B
NOISE GEN
DEV BUFF
DECODER ANTI BIRDIE STEREO SW
L
SD COMP
38 CLK GND 13 STRIM A VOL/ MUTE DC CUT B A R IN 15 A R B S IN 16 S A S B S A R B A L PCM B PCM CONTROL B B SRAM A S IN FILTER C A S OUT FILTER B NR
FF VCO
FF
FF PILOT DET
L IN 14
A B L
B
DATA DECODER
37 DATA
FM S METER FM IF
S-CURVE FM DET
PHASE DET
36 ENABLE A
VCC 6
TUNED
B
2 3
AM-MIX FM-IF
4
AM-IF
5
GND
7
STEREO
8
VCC
9
FM DET
10
AM. SD
11
FM. SD
12
AM. SD ADJ
13
IF-BUFF MUTE
14
AM/FM
15
VCO-STOP
VDD
17 18 19 20 21 DET GND DELAY OUT IREF VCC
22 S-OUT
23 R-OUT
24 L-OUT
25 DC CUT
26 DC CUT
27 28 29 A/D NS D/A
30 VDD
31 OSC
32 OSC
23
24
IC502 LC72131
XOUT AOUT FMIN VDD VSS AMIN PD IFIN
12 UNIVERSAL COUNTER
AIN
22 21
20
19
18
17
16
15
PHASE DETECTOR CHARGE PUMP REFERENCE DIVIDER UNLOCK DETECTOR SWALLOW COUNTER 1/16, 1/17 4BITS 12BITS PROGRAMMABLE DIVIDER POWER ON RESET 1/2
C2B I/F
DATA SHIFT REGISTER LATCH
1
3 4 5 6
8 10 11 13
· Display section IC202 BA6208
CE S DATA S CLK D OUT
SWITCH
SWITCH
REG 1 2 3 4 5 6 7 8 9
INPUT 1
FM/AM MONO I/O IN I/O IN
MOTOR DRIVE MOTOR DRIVE
XIN
OUTPUT 2
OUTPUT1
GND
Vcc
NC
INPUT 2
NC
NC
25