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• Waveforms
– KEY Board –
1 IC101 !™ XOUT
500 mV/DIV, 10 µs/DIV
1.2 Vp-p
13.3 µ s
2 IC101 !£ XIN
500 mV/DIV, 10 µs/DIV
2 Vp-p
13.3 µ s
3 T101
10 V/DIV, 200 ns/DIV
34 Vp-p
424 ns
4 Q106 Collector
2 V/DIV, 200 ns/DIV
5.2 Vp-p
320 ns
5 Q106 Base, Q107 Collector
200 mV/DIV, 200 ns/DIV
616 mVp-p
320 ns
– 13 –
• IC Block Diagrams
– MAIN Board –
IC1 CXA1238M-T6
30
29
28
27
26
25
24
23
22
21
20
FM FRONT-END
AM FRONT-END
REGULATOR
MPX
VCO
REGULATOR
1/2
PD1
COUNTER
1/2
PD2
COUNTER
AUTO
BLEND
MONO/STEREO
MUTING
SELECT
RIPPLE
DECORD
AMP
FILTER
1
2
3
4
5
6
7
IC2 LA4533M
MUTE
POWER
P/SW
1
10
MT/SW
CONTROL
SWITCH
POWER
OUT1
IN1
2
9
AMP
PRE GND
3
8
POWER GND
POWER
IN2
4
7
OUT2
AMP
6
VCC
REF
5
BIAS
19
18
17
16
FM IF/
DISCRI
AM IF/
DET
TUNING
INDICATOR
BAND-PASS
MUTE
8
9
10
11 12
13 14 15
– 14 –
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