Troubleshooting - Denon DCD-510AE Service Manual

TROUBLE SHOOTING
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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 +5VDD 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 t he presence t hat t he primary co mponent is
leaking or shorted and service it if defective.
After servicing, replace the fuse.
FLOW CHART NO.3
+3.3V is not outputted.
Is VCC(5V) voltage supplied to Pin(3) of IC94?
Check IC34, L370, L371, C370, C371 and the periphery
circuit, and service it if defective.
FLOW CHART NO.4
The fluorescent display tube does not light up.
Is +3.3V voltage supplied to Pins(37) of FL41?
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L 13942296513
Is the voltage of approximately +41V supplied to Pin(38) of
FL41?
Is the voltage of approximately 3.3V supplied to Pin(1),
(43) of FL41?
Check the fluorescent display tube control signal of a
microcomputer. (VFD-RST, VFD-CS, VFD-CLK, VFD-DATA
FLOW CHART NO.5
VF is not outputted.
Is approximately +42V voltage supplied to the kathode of
D914?
Check if there is any leak or short-circuit on the loaded
circuit, and service it if defective.
FLOW CHART NO.6
The key operation is not functioning.
Are the contact point and the installation state of the key
switches (SW41-SW47) normal?
When pressing each switches (SW41-SW47), do the voltage
of pin(86) of IC21 increase?
Replace IC21.
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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.
(T901, D902, D903, IC93, IC94)
No
Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side, and service it if defective.
No Is M+8V voltag e supplied to Pin(2) of IC93?
Check IC93, IC94 and the periphery circuit, and service it
if defective.
No Check the +5VDD l ine and service it if defective.
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No Check the VF line and service it if defective.
No Check the FIP1/FIP2 line and service it if defective.
Check D914, D915 and periphery circuit, and service it if
No
defective.
Re-install the switches (SW41-SW47) correctly or replace
No
the poor switch.
Check the switches (SW41-SW47) and their periphery, and
No
service it if detective.
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