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FLOW CHART NO.13
Hi-Fi audio does not operate normally.
Is each signal supplied to each pin of IC451 as below?
Front input terminal
Rear input 1 terminal
Rear input 2 terminal
Tuner audio signal
Yes
Is the 5V voltage supplied to Pins(15,32,36,46) of
IC451, or the 9V voltage to Pin(3) of IC451?
Yes
Is the Serial data and the Clock signal supplied to
Pins(38,39) of IC451?
Yes
Is the Audio signal outputted to Pins(75,76) of
IC451?
Yes
Is the Audio signal inputted into Pins(2,12) of
IC751?
Yes
Is the Audio signal outputted into Pins(14,15) of
IC751?
Yes
Check the line between Pins(14,15) of IC751 and
the audio output terminal (JK754, JK755).
L-ch
R-ch
No
Pin(9)
Pin(71)
No
Pin(7)
Pin(69)
No
Pin(11)
Pin(73)
No
Pin(53)
Pin(51)
No
No
No
No
No
Check the periphery circuit of the front input
terminal (JK651, JK652).
Check the periphery circuit of the rear input
terminal (JK101).
Check the periphery circuit of the rear input
terminal (JK102).
Is the SIF signal outputted from Pin(2) of IC1?
Yes
Is the Audio signal outputted
from Pins(30,31) of IC1?
Yes
Check the line between Pins(30,31) of IC1 and
Pins(51,53) of tuner.
Is the SIF signal outputted from Pin(22) of the tuner?
Yes
Check the line between Pin(2)
of IC1 and Pin(22) of tuner.
Check the circuit of P-ON+5V and P-ON+9V.
Check the line between Pins(38,39) of IC451 and
Pins(71,72) of IC501.
Replace IC451.
Check the line between Pins(77,80) of IC451 and
Pins(5,12) of IC751.
Is approx. 10V voltage supplied to Pin(16)
of IC751, or approx. -8V voltage supplied to
Pin(7) of IC751?
Yes
Check the AL+12V line (R752, D751)
and the AL-30V line (R751,R753).
Is the "L" pulse inputted into the Pins(9,10,11) of
IC751?
Yes
Replace
Check Q752 and the OUTPUT
IC751.
SELECT line.
No
No
Replace IC1.
No
Replace the
tuner.
No
No
E1-8-12
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