Denon DCD-F107 - Troubleshooting

21
DCD-F107
TROUBLE SHOOTING
FLOW CHART NO.1
The power cannot be turned on.
㸣
Is Power LED lit? 㸢No
㸣Yes
Is the +3.3V_NSW line voltage normal? 㸢No
㸣Yes
Is the +5_SYS line voltage normal? 㸢No
㸣Yes
Is the "H" level MCU Reset to Pin(77) of IC11? 㸢No
㸣Yes
Is normal state restored when once unplugged power
cord is plugged again after several seconds?
㸢No
㸣Yes
FLOW CHART NO.2
+3.3V_D is not outputted.
㸣
Is +7V_DRV voltage supplied to Pin(1) of IC93? 㸢No
Check if there is any leak or short-circuiting rectifier circuit
of Power transformer, and service it if defective.
(Main Trans,IC81,D917-D923)
㸣Yes
Check IC93 and the periphery circuit, and service it if
defective.
FLOW CHART NO.3
The fluorescent display tube does not light up.
㸣
Is +3.3V_D. voltage supplied to Pins(37) of F701? 㸢No Check the +3.3V_D line and service it if defective.
㸣Yes
Is the voltage of approximately +42V supplied to
Pin(38) of F701?
㸢No
Check D924-927,Q904 and periphery circuit, and service
it if defective.
㸣Yes
Is the voltage of approximately +7V supplied to
Pin(1),(43) of F701?
㸢No Check the FL1/FL2 line and service it if defective.
㸣Yes
Check if there is any leak or short-circuiting rectifier circuit
of SUB Power transformer, and service it if defective.
(T901,IC94,IC95,Q905-Q909,D930,D931,D934-D936)
Check IC11,IC12and the periphery circuit, and service it if
defective.
Check each voltage regulator circuit and service it if defective.
Check the fluorescent display tube control signal of a
microcomputer. (FL_RST,FL_CS,FL_CLK,FL_MDT)