Sony WCS-880, Service Manual

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WCS-880
16 16
LX
SWITCH
VSS 1
VOUT 2
LX 3
BUFFER
PHASE
COMPARATOR
PWM CONTROL
OSC
50/100/180kHz
VLX
LIMITER
SLOW
START
ERROR
AMP
VREF
+
–
GND
28
AF OUT
27
VCC AFC/AGC
26
RIPPLE FIL
TER
25
AF IN
24
DET OUT
23 22
AFC/AGC
21
IF GND
20
TUNING METER
19
NC
18
FM IF IN
17
AM IF IN
16
FM/AM BAND SELECT
15
MUTE
1
FM DISCRI
2
NF
FM OSC
3
VOL
4
AM OSC
5
AFC
6 7
REG OUT
8
FM RF
9
AM RF IN
10
NC
11
FM RF IN
12
FE GND
13
FM/AM FE OUT
14
TUNING
METER
FM IF
AMP
FM
DISCRIMI-
NATOR
FM
FRONT-END
AM
FRONT-END
AF
POWER AMP
AM IF AMP, DET,
AGC
1
2
3
4 FIN
GND
DO
VCC OSCIN
LD
8
7
6 FOUT
5 DIV
SWALLOW
COUNTER
(A)
CONTROL CIRCUIT
PRESCALER
(P)
MC
COMPARATOR
FREQUENCY
DIVIDER
REFERENCE
FREQUENCY
DIVIDER
PHASE
COMPARATOR
OUTPUT
SELECTOR
CIRCUIT
fr
fp
CHARGE
PUMP
DIGITAL
LOCK
DETECTOR
REFERENCE
COUNTER
(R)
CRYSTAL
INPUT
BUFFER
DATA
SET
CIRCUIT
MAIN
COUNTER
(N)
3.5 Vp-p
10.3
µ
s
1.2 Vp-p
80 ns
2 Vp-p
80 ns
3.5 Vp-p
10.3
µ
s
– RX BASE Board –
1 IC101
2
(LX)
2 V/DIV, 5
µ
s/DIV
• Waveforms
– TX BASE Board –
1 Q51 Emitter
1 V/DIV, 50 ns/DIV
2 IC51 8 (OSCIN)
500 mV/DIV, 50 ns/DIV
3 IC101 3 (LX)
2 V/DIV, 5
µ
s/DIV
• IC Block Diagrams
IC51 MB15C132PFV-G-BND-ER (TX BASE Board)
IC101 XC6371A301PR (TX BASE Board)
(RX BASE Board)
IC1 CXA1691BM-T6 (RX BASE Board)