Trouble Shooting - Marantz SR6004 Service Manual

6. TROUBLE SHOOTING

Symptom
The power cannot be turned on.
Standby LED blinks slowly.
Turns on and then off the STANDBY.
Standby LED flickering slowly.
Turns on and then Standby LED flickering
faster.
All segment of FL Display is turrn on.
"CHECK E2P IF"on the FL DISPLAY
Reason
+5VL is not outputted.
The voltage between CN85-20pin and
GND is not 5V.
Main CPU is not work.
Front panel is not correctly connected with
Main CPU.
F602 has been disconnected.
(When F602 has been disconnected, the
serious stumbling block
generated. )
F603 has been disconnected.
(F603 cuts when the protection of Main
CPU doesn't work. )
The temperature of the heat sink is
abnormally high.
The voltage-controlled circuit is defective.
The temperature detection circuit is
defective.
P_AMP_FAIL(CN85-10pin) is 0V.
The DC voltage of several V or more has
been generated in the output of the power
amplifier.
P_AMP_FAIL(CN85-10pin) is 0V.
The power supply circuit breaks down and
a more abnormal voltage has been
detected short. (+12V/-12V/+55V/-55V)
P_LINE_FAIL(CN85-12pin) is 0V. s
An abnormal current flows to any power
transistor due to the breakdown of the
power amplifier.
P_CURR_FAIL(CN85-16pin) is 0V.
+5VD Supply is fail.
+5V is not supplied to FL display.
EEP-ROM cannot be normally rewritten.
22
Check Points
T600,IC51,D606~D609 (MAIN)
IC105,IC90(HDMI)
CN82(HDMI)
BN82(FRONT)
Main Transformer
D201,C636,C637(MAIN)
might be
F603,Q610,CN66(MAIN)
CN31,BN85(USB/CNT)
Each Transistor of Power amplifier.(MAIN)
RL20,Q200,Q201,CN23(REG)
CN69,TH60,Q615(MAIN)
The voltage between each 1pin and GND
of CN70~76(MAIN) is confirmed.
Each Tr. Of Power amplifier (MAIN)
ET60,CN68(MAIN)
CN51(INPUT)
IC24,IC25,D201~D205(REG)
C636,C637(MAIN)
Q513,Q514(INPUT)
The voltage between each 1pin and 2pin
of CN70~76(MAIN) is confirmed.
Q706,708,713,715,
703,705,719,721,
709,710,716,718,
711,712(MAIN)
F201,D208,IC21,BN22(REG)
CN81,CN82(HDMI PWB)
BN82,FL10(FRONT)
IC86,IC115(HDMI)
( ):PWB name