Aiwa HV-MC90 Service Manual page 44

ELECTRICAL TROUBLESHOOTING -10/13
4. AUDIO CIRCUIT
(1) No sound in EE Mode
No sound in EE Mode.
Is 5V applied to the IC301 Pin 96?
Is the Audio signal applied to the
IC301 Pin 9?
Does the Audio signal appear at the
IC301 Pin 11?
Check the connection of the Audio
out Jack.
Does the CLK/Data signal(I
appear at the IC301 Pins 62, 63 ?
Replace the IC301.
(2) No sound in PB MODE
No sound in PB Mode.
Is 5V applied to the IC301 Pin 96?
Does the CLK/Data signal(I
the IC301 Pins 62, 63?
Does the Audio signal appear at the
IC301 Pin 1?
Does the Audio signal appear at the
IC301 Pin 11?
Replace the IC301.
YES
No sound.
YES
YES
YES
YES
2 C)
YES
No sound.
YES
YES
2 C) appear at
YES
YES
NO
NO
Check the line of the 5V Line.
(Power Circuit)
NO
Check the path of LINE/AUDIO.
NO
Is the Audio Mute "High" signal applied
NO
to the IC301 Pin 99?
YES
Check the IC501 Pin 51.
(Audio Mute "H".)
Check the IC501 Pin 27(CLK),
NO
28(Data) Line.
NO Check the circuit line of the 5V Line.
(Power Circuit)
NO
Check the IC501 Pin 27 (CLK),
28 (Data) Line.
NO Check the connecting state between the
P3D02 Pin 6 and A/C Head.
YES
Is the Audio Mute "H" applied to the
IC301 Pin 99?
NO
YES
Check the IC501 Pin 55.
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