Denon DVD-2500BTCI Service Manual page 25

FLOW CHART NO.11
The fluorescent display tube does not light up.
Is 3.3V voltage supplied to Pin(64) of IC3001?
Is the voltage of approximately -30V supplied to
Pin(56) of IC3001?
Is there 1.8MHz oscillation at Pin(58) of IC3001?
Are the filament voltage supplied between Pin(1)
and Pin(62) of the fluorescent display tube?
And the negative voltage applied between these
pins and GND?
Replace the fluorescent display tube.
FLOW CHART NO.12
The key operation is not functioning.
Are the contact point and the installation state of
the key switches (SW3000-3003,
SW3006-SW3010, SW3100) normal?
When pressing each switches (SW3000-3003,
SW3006-SW3010, SW3100), do the voltage of
Pin(3,4) of IC2000 increase?
Replace IC2000.
FLOW CHART NO.13
No operation is possible from the remote control unit.(Operation is possible from the unit.)
Is 5V voltage supplied to Pin(1) of RS3000
(remote control receiver) ?
Is the "L" pulse sent out Pin(1) of RS3000 (remote
control receiver) when the remote control unit is activated?
Is the "H" pulse inputted to the Pin(27) of IC2000?
Replace IC2000.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
DVD-2500BTCI
No
Check the P-ON+3.3V line and service it if
defective.
No
Check the -FL line and service it if defective.
No
Check R3006, C3003, IC3001 and their periphery,
and service it if defective.
Check D1010, D1017, T1001, and their periphery,
and service it if defective.
No
Is -20V voltage supplied to collector of Q2502?
Is the "H" signal inputted
to the base of Q2507?
Check Q2502, Q2508 and their periphery,
and service it if defective.
No
Re-install the switches (SW3000-3003,
SW3006-SW3010, SW3100) correctly or replace
the poor switch.
No
Check the switches (SW3000-3003,
SW3006-SW3010,SW3100) and their periphery,
and service it if detective.
No
Check EV+5V line and service it if defective.
Replace the RS3000 (remote control receiver) or
No
remote control unit.
No
Check the line between the RS3000 (remote control
receiver) and the Pin(27) of IC2000, and service it if
detective.
25
No
Yes
Check FL-SW
line, and service
No
it if defective.
Yes