Marantz SR7013 Service Manual page 88

TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
The unit does not power on
Measure the voltage of the DIGITAL PCB [CN903 : 5, 6pin].
Is DC5.2V supplied?
YES
Does the FLD light go out after several seconds,
and does the power indicator LED then blink in
red?
YES
Disconnect the MAIN PCB connector [CN971] and
check "3-2. Protection History Display Mode".
1.2. Fuse is blown
Check the rectifier diode in the
Check for leaks and short circuits
rectifier circuit on the secondary
in the parts on the primary side.
side, and check for short circuits.
Replace any faulty parts.
Replace any faulty parts.
Replace the fuse after repair.
NO
Disconnect the connector [CN903] that supplies power from the
SMPS PCB to the DIGITAL PCB and measure the voltage of the SMPS
PCB [BN901 : 5, 6pin].
Is DC5.2V supplied?
• Check the contact between [CN903 and BN901].
• Check for breakages and short circuits in the circuits and parts be-
tween [CN903] on the DIGITAL PCB and the microprocessor power
supply and replace any faulty parts.
NO
Is the fuse blown out?
YES
See "1.2. Fuse is blown"
Blown fuse
Check for short circuits between the
regulator output terminal and GND
in the power supply stabilization
circuit. Replace faulty parts if there
is a short circuit.
NO
Is the fuse blown out?
YES
See "1.2. Fuse is
NO
• Check if there is a normal connection between the DIGITAL PCB [CN69B] and the FRONT PCB [CN69A].
• Check if there is a normal connection between the MAIN TRANS and the FRONT PCB [CN605].
Check the microcomputer peripheral circuits and power supply circuits of the DIGITAL PCB and replace
any faulty parts.
88
NO
TO "6. SMPS"
YES
blown"
YES