Troubleshooting - Denon DVD-2500BTCI Service Manual

FLOW CHART NO.1
The power cannot be turned on.
Is the fuse normal?
Is normal state restored when once unplugged
power cord is plugged again after several seconds?
Is the AL+5V line voltage normal?
Check each rectifying circuit of the secondary circuit
and service it if defective.
FLOW CHART NO.2
The fuse blows out.
Check the presence that the primary component
is leaking or shorted and service it if defective.
After servicing, replace the fuse.
FLOW CHART NO.3
When the output voltage fluctuates.
Does the photo coupler circuit on the secondary
side operate normally?
Check IC1001, IC1003, D1006 and their periphery,
and service it if defective.
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of power circuit.
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary
side, and service it if defective. (D1010, D1011, D1016, D1018, D1023, IC2600, IC2601, Q2606, Q2608, Q2609, Q2610,
Q2611)
FLOW CHART NO.5
-FL is not outputted.
Is -30V voltage supplied to the emitter of Q2503?
Is the "L" signal outputted to the collector of
Q2507?
Is 3.3V voltage supplied to the emitter of Q2504?
Is 3.3V voltage outputted to collector of Q2504?
Check Q2503 and their periphery, and service it if
defective.

TROUBLESHOOTING

Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Yes
DVD-2500BTCI
No
See FLOW CHART No.2 <The fuse blows out.>
No
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(IC1001, Q1003, T1001, D1001, D1002, D1003,
No
D1004, D1007, D1008, C1010, R1013)
Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side, and service it if defective.
No
Check IC1003, D1009 and their periphery,
and service it if defective.
Check D1018, C1021 and periphery circuit,
and service it if defective.
Is the "H" signal inputted to the base of Q2507?
Yes
Replace Q2507.
Check EV+3.3V line and service it if defective.
Replace Q2504.
23
No
Check FL-SW line and service
it if defective.