Pioneer TS4 Service Manual page 51

[Analog Audio section]
((F))
↓
[Check the Power supplied properly.]
↓
[Examine IC4002(AK4319A-VM D/A converter) input]
(IC4002:Pin 6: SDATA)
↓
<How was the result?>
↓
[Examine IC4002(AK4319A-VM D/A converter) output.]
(IC4002:Pin 18/19: L, IC4002:Pin 16/17: R)
↓
<Are they OK?>
↓
[Examine IC4003(NJM3404AM OP. Amplifier) output]
(IC4003:Pin 1: L, IC4003:Pin 7: R)
↓
<How is the result?>
↓
[Examine IC4001(STV6411A:Audio/Video Switch) Audio outputs.]
↓
[Select where to go from below.]
↓
Audio output terminals which are NG
TV-SCART & VCR-SCART & CINCI
TV-SCART & VCR-SCART
TV-SCART & CINCI
TV-SCART
VCR-SCART
CINCI
Others
↓
<How is the result?>
↓
<Q4014/Q4017(UMD2N)Pin 3: High?>
(TV_MUTE/VCR_MUTE)
↓
[Examine around the Muting circuitry]
(Q4015/Q4016/Q4018/Q4019/Q4030/D4012/D4013/Q4014/Q4017)
(From page 48)
NO
OK
YES
NO
NO
OK
→
→
→
→
→
→
→
NG
OK
NO
YES
[Trace the line going up to IC2001 OMEGA:STi5510A.]
[Replace IC4002]
[Replace IC4003]
Examine: IC4001
Pin 2: Pin 64: Pin 62:
TV_L
TV_R VCR_L
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[Replace IC4001]
[Add solder to the CN4001]
Pin 60: Pin 59: Pin 58:
RCA_L
VCR_R RCA_R
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TS4
51