Aiwa HV-FX7800 Service Manual page 55

ELECTRICAL TROUBLESHOOTING -15/17
(3) No sound (Hi-Fi Model Only)
Check the Vcc of IC751 Pins 1, 19, 33.
Check the Tuner SiF signal at IC751 Pin 2.
Check the oscillator of IC751 Pins 5, 6.
Check the Audio of IC751 Pins 30, 31.
Check the Audio of IC801 Pins 2, 3.
Check the Audio of IC801 Pins 16, 17.
Check the signal flow from IC801
pins 18, 19 to JK901 Pins 1, 3.
No sound
YES
YES
YES
YES
YES
YES
YES
NO
Check 5V power.
NO
Check the Tuner Audio of TU701 Pin 22.
NO
Replace X751.
NO
Check the IIC Clock and Data at
IC751 Pins 12, 13.
NO
Check the signal flow from IC751
Pins 30, 31 to IC801 Pins 2,3.
NO
Check the IIC Clock and Data at
IC801 Pins 42, 43.
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