Zenith XBV 443, Service Manual

Page: 15 / 108

3-6
NO 13VA.
Check or Replace
the D110.
Is the Vcc(13V)
supplied to C123?
Check or Replace
the cap/Drum
Is the D117/D115
Normal?
NO
NO
Replace the
D117/D115.
YES
YES
YES
(6) No 13V(TO Cap, Drum Motor)
NO 8V.
Is there about 13V
at the IC151 pn1?
YES
Is there about 3.3V~
5V at the IC151 pin4?
YES
Check the IC151
and Replace
YES
(7) No 8V
Check or Replace
the D110.
NO
NO
Check the PWR CTL
“H” signal from µ-com
NO 33V.
Is the Vcc(12V) supplied
to Q165 Collector? Check or Replace
the D110.
Is the Vcc(10V) sup-
plied to Q165 Base Check or Replace
the ZD171.
Check or Replace
the Q165
YES
YES
YES
(9) No 9V
No REG 12V
Check or Replace
the D110. Is the Vcc(13V) supplied
to Q156 Collector?
Is the Vcc(13V) sup-
plied to Q156 Base
NO NO
Check the PWR CTL
“H” signal from µ-com
Check the 33V
Line
NO NO
YES
YES
Check or Replace
the Q156
YES
(8) No REG 12V