Service manual

9-4 A94F0TR
EV+9V is not output.
FLOW CHART NO.18
Is approximately +13V voltage supplied to the
anode of D909?
P-ON+3.3V is not output.
FLOW CHART NO.15
Is approximately
+5V voltage supplied to the
cathode of D633?
Is the "H" signal (approximately +3.5V) inputted to the
base of Q637?
No
Ye s
Ye s
Check C633, D633 and their periphery circuit, and
service it if defective.
Check Q638, Q639, P-ON-H2 line and their periphery
circuit, and service it if defective.
Ye s
See FLOW CHAR
T No.13 <D+5.5V is not output.>
See FLOW CHART No.14 <P-ON+3V is not ou
tput.>
No
No
No
EV+3.3V is not output.
FLOW CHART NO.16
Is approximately +
4.6V voltage supplied to the
collector of Q903?
Ye s
Replace Q637.
Check Q903, D905 and their periphery
circuit, and service it if defective.
See FLOW CHAR
T No.13 <D+5.5V is not output.>
No
DVD-ON+3.3V is not output.
FLOW CHART NO.17
Is approximately +
5V voltage supplied to the
collector of Q904?
Ye s
Check Q904, D906, and their periphery
circuit, and service it if defective.
Check D901, D902, D903, D
909 and their periphery
circuit, and service it if defective.
P-ON+3V is not output.
FLOW CHART NO.14
Is approximately +3V voltage supplied to the
cathode of D647?
Ye s
No
Check if there is any leak or short-circuit on
the loaded circuit, and ser
vice it if defective.
Check C645, D647 and their periphery circuit, and
service it if defective.