Zenith XBV443 - Page 14

NO 33V.
Is the Vcc(33V) sup-
plied to Q161 Emitter?
Check or Replace
the D113.
Is the Q162 Base
“H”?
Check the PWR CTL
“H” signal from µ-com
Check or Replace
the Q161
YES
YES
YES
(5) No 33V
3-5
NO 5V.
Check or Replace
the D118.
Is the Vcc(5.3V) sup-
plied to Q160 Emitter?
Check or Replace
the Q160
Is the Q162 Base
“H”?
NO
NO
Check the PWR CTL
“H” signal from µ-com
YES
YES
YES
(2) No 5V
No 3.3V.
Check or Replace
the D111
Check the PWR CTL
“H” signal from µ-com
Is there about 3.7V
at the IC152 pin1?
Is there about 3.3V~
5V at the IC152 pin4?
Check the IC152
and Replace
NO
NO
YES
YES
YES
(3) No 3.3V
No SW5V
Check or Replace
the D118.
Is the Vcc(5.3V) sup-
plied to Q163 Emitter?
Is the Q164 Base
“H”?
NO NO
Check the PWR CTL
“H” signal from µ-com
NO NO
YES
YES
Check or Replace
the Q163
YES
(4) No SW5V