Denon DVD-900 Service Manual page 5

FLOW CHART NO.8
No operation is possible from the remote control unit.
Operation is possible from the DVD, but no
operation is possible from the remote control unit.
Is no operation possible if replacing the remote
control unit?
Is 5V voltage supplied to Pin(3) terminal of infrared
remote control receiver?
Is the "L" pulse sent out from Pin(1) terminal of the
receiver when the infrared remote control is activated?
Is the "L" pulse signal supplied to Pin(26) of
CN1001 from Pin(1) of receiver? (Be operated by
SEARCH(-), SEARCH(+), PLAY, STILL/PAUSE,
STOP, POWER and OPEN/CLOSE button.)
FLOW CHART NO.9
PON 12V is not outputted.
Is PON12V voltage supplied to the collector of Q1002?
Does the P-ON switch circuit operate normally?
(Q1005, Q1006, D1036, etc.)
Replace Q1002.
FLOW CHART NO.10
PON 5V is not outputted. (PON 12V is outputted normally.)
Is 5V voltage supplied to the collector of Q1004?
Is the "H" pulse inputted into the base of Q1004?
Replace Q1004.
FLOW CHART NO.11
-FL is not outputted.
Is -24V voltage supplied to the anode of D1003?
Check if there is any leak or short-circuit on the
loaded circuit.
FLOW CHART NO.12
PON 3.3V is not outputted.
Is 3.3V voltage supplied to the emitter of Q1011?
Does the P-CON switch circuit operate normally?
(Q1005, Q1006, etc.)
Replace Q1011.
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Original remote control unit is poor.
Check EV 5V line.
Replace the infrared remote control receiver.
Check the line between the infrared remote control
receiver and Pin(26) of CN1001.
Replace DVD Main CBA unit.
Check D1009, C1012 and the periphery circuit.
Check each component, and replace.
No
Check D1030, D1048, C1035, C1048 and the
periphery circuit.
No
Check D1046 and the periphery circuit.
No
Check D1003 and periphery circuit.
No
Check D1008, D1015, C1007, C1038 and the
periphery circuit.
No
Check each component, and replace.
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