Zenith XBS344 Series Service Manual page 29

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