Zenith XBV243 Service Manual page 14

TROUBLESHOOTING (CONTINUED)
(4) No 5V (TO DVD)
NO 5V.
YES
NO
Is 5.3VA present on
Q113 Emitter?
YES
NO
Is the Q115 Base
"H"?
YES
NO
Is about 5V present on
Q113 Base?
YES
Check or Replace
Q113/Q115
(6) No 33V (TUNER)
No 33V.
YES
N O
Is Q115 Base "H"?
YES
Check or Replace
Q114, R154, R155.
VR168 - 923-03485
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ELECTRICAL
(5) No REG 5V (AVCP)
5.3VA Line Check.
Check the Power
Control.
Check or Replace
Q115, R157, R158,
R159, D121.
Check the Power
Control.
3-2
No REG 5V.
YES
NO
Is 5.3VA present on
Q117 Collector?
YES
NO
Is 33V present on
Q117 Base?
YES
Check or Replace Q117,
R167, ZD105, C162.
(7) No REG 12V
No REG 12V.
YES
NO
Is 13V present on
Q112 Collector?
YES
NO
Is 33V present on
Q112 Base?
YES
Check or Replace Q112,
ZD103, R153, C151.
5.3VA Line Check.
Check 33V Line.
Check or Replace
D110.
Check 33V Line.
D35E COMBO - ELECTRICAL