Zenith XBV 443, Service Manual

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MECHANISM TROUBLESHOOTING GUIDE
Auto Stop operates.
(PLAY/CUE/REV)
Does the T/UP or the supply
reel pulse occur?
Does the pinch roller attached to
the Capstan shaft turn in opera-
tion of the Play/Cue/Rev.
Replace the reel sensor.
Is output of the DFG, DPG
normal?
Check the assembly mode.
Check the spring pinch.
Replace the drum motor.
Check the Servo, Syscon.
Check the Syscon, µ-com.
No cassette loading is done.
Insert the cassette.
Check the holder assembly CST.
Does output of the CST IN S/W
change?
(In insertion of the REC tape:
“L”_“H”_ “L”)
(In insertion of the REC preven-
tion tape:
“L”_ “H”_ “L”_ “H”)
Is the CST IN S/W normal?
Is operation of the lever
assembly S/W normal?
Check the Syscon circuit.
Check the Syscon circuit.
Replace the CST IN S/W.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO NO
NO
YES
C.
D.