Zenith XBV 443, Service Manual

Page: 95 / 108

MECHANISM TROUBLESHOOTING GUIDE
4-26
No cassette insert is done.
Does the lever assembly
switch operate? Is the lever assembly switch
spring normal?
Does the CST IN switch
operate normally?
Add or replace the lever
assembly switches spring.
Is the Vcc of the main P.C.B
assembly?
YES
YES
Check the Syscon circuit.
YES
Check the power circuit.
NO
Is voltage between the cassette
switch terminal and the GND on
the main P.C.B assembly?
YES
Is there short between the cassette switch terminal
and the GND on the main P.C.B assembly?
Replace the main P.C.B assem-
bly or remove the short part.
NO
Check the mode switch position
and the Syscon circuit.
Replace the CST IN switch.
YES
NO
YES
NO NO
Replace the F/L switch.
NO
NO
No cassette eject is done.
Does the L/D motor turn in reverse?
Check the L/D motor and the drive IC.
Replace the lever assembly switch.
Does the lever assembly switch operate?
YES
NO
NO
Does the arm assembly F/G operate?
YES
NO
Does the opener door operate?
YES
Replace the arm assembly F/L
Replace the opener door.
2. Front Loading Mechanism
A.
B.