Denon DVD DVD-1930, Service Manual

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15
DVD-1930
TROUBLESHOOTING
FLOW CHART NO.2
The fuse blows out.
After servicing, replace the fuse.
Check the presence that the primary component
is leaking or shorted and service it if defective. Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side, and service it if defective.
FLOW CHART NO.3
When the output voltage fluctuates.
Yes
No
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. (D1003, D1006, D1008, D1016, D1030, IC1003, Q1002, Q1004, Q1005, Q1011, Q1014)
Does the photo coupler circuit on the secondary
side operate normally?
Check IC1001, D1012, D1024 and their periphery,
and service it if defective.
Check IC1001, IC1006, D1015 and their
periphery, and service it if defective.
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 EV +3.3V line voltage normal?
See FLOW CHART No.2 <The fuse blows out.>
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(Q1003, Q1001, Q1008, T1001, D1001, D1002,
D1004, D1005, D1011, C1003, C1005)
Check each rectifying circuit of the secondary circuit
and service it if defective.
Yes
Yes
Yes
No
No
No
Is approximately -23V voltage supplied to the
anode of D1003?
Check D1003 and periphery circuit, and service it
if defective.
Check if there is any leak or short-circuit
on the loaded circuit, and service it if defective.
No
FLOW CHART NO.5
-FL is not outputted.
Is F1(-14V) outputted normally?
Refer to "FLOW CHART NO.11"
<The fluorescent display tube does not light up.>
Yes
Is approximately -20V voltage outputted to the
collector of Q1013?
Check Q1013 and periphery circuit, and service it
if defective.
No
Yes
No
Yes