Marantz AV8802/U1B - TROUBLE SHOOTING; 1. POWER; 1.2. Fuse is blown

TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
YES YES
NO
NO
Does the power indicator on the front
panel ash in green or white when the
power is turned on?
Has a fuse broken?
Does the power display on
the front panel change to
lighting in green after ap-
proximately 10 seconds?
The unit does not power on
Has a fuse broken?
Does the power indicator on the front
panel ash in red when the power is
turned on?
Is DC5V being supplied from
the SMPS PCB (N6502) to
the DIGITAL PCB?
See "
1.2. Fuse is blown.
"
See "
1.2. Fuse is blown.
"
Check the circuits around the Micropro-
cessor on the DIGITAL PCB and replace
any faulty parts.
Is DC5V output even when the
connector (N1808) supplying power
from the SMPS PCB to the DIGITAL
PCB is removed?
Check the circuits around
the Microprocessor on the
DIGITAL PCB and replace
any faulty parts.
Check for breakages and short
circuits in the circuits and parts
between N1808 on the DIGITAL
PCB and the microprocessor power
supply and replace any faulty parts.
Connect the connectors correctly.
TO "
6. SMPS
"
(See 107 page)
YES
YES
Check for leaks and short circuits in the
parts on the primary side. Replace any
faulty parts.
Broken fuse
Check the rectier diode in the rectier
circuit on the secondary side, and check
the circuit for short circuits. Replace any
faulty parts.
Replace the fuse after repair.
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.
1.2. Fuse is blown
NO
NO
NO
YES
YES
NO NO
YES
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