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1
No Sound (Analog in)
Here the trouble shoot which focuses on the hardware troubles regarding PCB assembly is explained.
Of course, with actual repair there are also troubles due to damaged Power Transformer, Wiring, soldering etc. in addition to PCB assembly.
D
Process
Check Point
(BAAF-1712)
R6690
1
●
: +21.5V
(BAAF-1712)
J4036, J4000
●
J4000 : +15V
2
●
J4036 : -15V
(BAPRC-1758)
P8002A
3
●
No.11 pin : +3.2V
C
(BAAF-1712)
J4051
4
●
: signal
(BAAF-1712)
Q6050, Q6060
●
Q6050(base) : signal
5
●
Q6060(base) : signal
6
B
A
1
2
3
Damaged PCB
No Good
BAAF-1712
OK
No Good
BAAF-1712
OK
No Good
BAAF-1712
OK
No Good
BAAF-1712
OK
No Good
BACLA-1734
OK
BAAF-1712
2
3
4
5
BAPRC-1758
BACLA-1734
BAAF-1712
●Each voltage is shown as the reference value.
Value error : Plus or minus 15%
4
5
6
Trouble Shoot
TX-SR343/444/HT-R494
TX-NR609
6
D
C
B
A
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