Sony SRF-PSY04, Руководство по обслуживанию

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– 13 – – 14 –
• Waveforms
– KEY Board –
1
IC101
!™
XOUT
500 mV/DIV, 10 µs/DIV
2
IC101
!£
XIN
500 mV/DIV, 10 µs/DIV
3
T101
10 V/DIV, 200 ns/DIV
4
Q106 Collector
2 V/DIV, 200 ns/DIV
5
Q106 Base, Q107 Collector
200 mV/DIV, 200 ns/DIV
1.2 Vp-p
13.3
µ
s
2 Vp-p
13.3
µ
s
34 Vp-p
424 ns
5.2 Vp-p
320 ns
616 mVp-p
320 ns
• IC Block Diagrams
– MAIN Board –
IC1 CXA1238M-T6
VCO
REGULATOR
FM FRONT-END
AM FRONT-END
MPX
REGULATOR
MONO/STEREO
SELECT
DECORD
AMP
MUTING
AUTO
BLEND
TUNING
INDICATOR
AM IF/
DET
FM IF/
DISCRI
RIPPLE
FILTER
BAND-PASS
MUTE
1
27 28 29 30 24 25 26 21 22 23 18 19 20 16 17
2 3 4 5 6 7 8 9
PLL LPF1
PILOT DET LPF2 PILOT DET LPF2
ST IND/VCO CHECK
L-CH OUT
VCC
R-CH OUT
RIPPLE FILTER
AGC AFC1
10
AGC AFC2
13
FM IF IN
14
AM IF IN
15
BAND SELECT
11
GND
12
TUNE IND
1/2
COUNTER
1/2
COUNTER
PD1
PD2
FM/AM FE OUT FM GND
FM RF IN AM RF IN FM RF REG FM OSC AFC AM OSC MUTE FM DISCRI GND PLL LPF2 MPX REG VCO
IC2 LA4533M
MT/SW
OUT1
POWER GND
OUT2
VCC
P/SW
IN1
PRE GND
IN2
REF
1
2
3
4
5
10
9
8
7
6
POWER
AMP
POWER
AMP
MUTE
CONTROL
POWER
SWITCH
BIAS