Zenith XBS344 Series, Service Manual

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3-17
Hi-Fi REC.
It is impossible to record and playback
Hi-Fi Audio signal.
Check Vcc of IC801. (Pins 3, 15, 32, 46)
Check Power.
Check ports of µ-COM.
Check the Port of µ-COM.
Check Audio Input signal Line
(9, 11, 12, 71, 73, 74), Tuner(57).
Replace IC801.
Check the Port of u-COM.
B.
Check IC801 Pin 37(Data),Pin 38(CLOCK).
Is IC501 Pin 84(A.Mute) “High”?
YES
YES
YES
Are Audio signals present at IC801
Pins 78, 80?
Do FM Audio signals appear at IC801
Pin 26?
YES
Is IC801 Pin 17(REC “H”) “High”?
Check the Contact Points of Drum
Connector if good then Replace the Drum.
YES
YES
YES
NO
NO
NO
NO
NO
NO