Read Sony ICF-S79W Service Manual online
ICF-S79W
ICF-S79W
10
10
S109
S101
S112
S110
S111
S107
S113
S106
S105
S104
S103
S102
KEY BOARD
1-676-961-
(11)
11
S108
RADIO ON
1
2
3
4
5
OFF
BAND
WEATHER
CLOCK
–
+
SELECT /
RESET TUNING/PRESET TIMER
PRESET
TUNE/TIMER ADJUST
TIME ADJUST
TIMER
SET/ON/OFF
9
1
A
MAIN
BOARD
A
B
C
D
1
2
3
4
5
6
7
5-4. PRINTED WIRING BOARD - KEY Board -
•
: Uses unleaded solder.
(Page 9)
IC2 CXA1019M
FM FE
TUNING METER
AM IF DET AGC
AF POWER AMP
FM IF
FM/AM
IF OUT
FM RF IN
FE GND
NC
AM RF IN
FM RF
FM OSC
REG OUT
AFC
AM OSC
NF
VOL
FM DISCRI
GND
FM/AM BAND
SELECT
FM IF IN
AM IF IN
NC
METER
IF GND
DET
OUT
AFC AGC
AFC AGC
AF IN
RIPPLE FIL
TER
AF OUT
VCC
GND
AM FE
FM
DISCRIMINATOR
14
13
11
9
8
7
2
1
6
5
3
4
15
16
17
18
19
20
21
22
23
24
25
26
27
28
12
10
• Waveforms
– MAIN Board –
– MAIN Board –
IC6 XG (XOUT)
500 mV/DIV, 5
μs/DIV
13.4
μs
1.8 Vp-p
Q11-1 (Base), -2 (Collector)
200 mV/DIV, 100 ns/DIV
320 ns
680 mVp-p
Q11-1 (Collector)
2 V/DIV, 100 ns/DIV
322 ns
5.4 Vp-p
• IC Block Diagrams
– MAIN Board –
– MAIN Board –
IC1 TA2030FN (EL)
MIX OUT
OSC OUT
FM OSC
TV OSC
VCC
FM RF
TV RF
GND
TV IN
TV BY
RF GND
FM BY
FM IN
MODE SW
PW SW
IF OUT
16 15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TV
OSC
BUFFER
MIX
FM RF
AMP
IF
AMP
POWER/MODE
SWITCH
TV RF
AMP
BUFFER
FM
OSC
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