Marantz NR1609 Service Manual page 75

TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
The unit does not power on
Does the power indicator on the front panel flash
in red when the power is turned on?
YES
YES
Is a fuse blown? See "1.2. Fuse is
NO
Is DC 5 V being supplied from the SMPS PCB
[CN4141] to the DIGITAL PCB?
YES
Check the circuits around the Microproces-
sor on the DIGITAL PCB and replace any faulty
parts.
Does the power indicator on the front panel turn
off after around 10 seconds?
NO
YES
Is a fuse blown? See
NO
Check the voltage of [N1019 : 1 - 6pin] on the
DIGITAL PCB while the power display is flashing in
green.
0.6V or -0.6V
Remove the connector [CP4001] of the SPEAKER PCB.
Check the "3-2. Protection History Display Mode"
NO
Does the power shut down after several seconds?
NO
blown" TO "6. SMPS"
NO
Is DC5V output even when the connector [N1033]
supplying power from the SMPS PCB to the DIGI-
TAL PCB is removed?
YES
Check for breakages and short circuits in the cir-
cuits and parts between [N1033] on the DIGITAL
PCB and the microprocessor power supply and
replace any faulty parts.
YES
Are there any parts not fully connected into the
connectors that connect the PCBs?
"1.2. Fuse is blown" Connect the connectors correctly.
0V
Check the circuits around the Microprocessor on
the DIGITAL PCB and replace any faulty parts.
1.2. Fuse is blown
YES
Check for leaks and short circuits
in the parts on the primary side.
Replace any faulty parts.
NO
NO
TO "3-2. Protection History
Display Mode"
YES
75
Blown fuse
Check for short circuits between the
Check the rectifier diode in the
regulator output terminal and GND
rectifier circuit on the secondary
in the power supply stabilization
side, and check for short circuits.
circuit. Replace faulty parts if there
Replace any faulty parts.
is a short circuit.
Replace the fuse after repair.