Trouble Shooting; Power - Marantz NR1605/U1B Service Manual

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 green
or white when the power is
turned on?
YES
Does the power display
on the front panel change
to lighting in green after
approximately 10 seconds?
NO
Has a fuse broken?
NO
Check the voltage of pins
1,3-7 of N1019 on the HDMI
PCB while the power display
is flashing in green or white.
0.6V or -0.6V
Remove the connector (CP4001) of the SPK PCB.
Check the "3.5. Protection history display mode"
(See 49 page)
1.2. Fuse is blown
Check for leaks and short
circuits in the parts on the
primary side. Replace any
faulty parts.
Does the power indicator on the
NO
front panel flash in red when the
power is turned on?
NO
Has a fuse broken?
NO
Is DC5V being supplied from
the SMPS PCB (CN4141) to
the HDMI PCB?
YES
Check the circuits around
the Microprocessor on the
HDMI PCB and replace any
faulty parts.
YES
YES
See "1.2.Fuse is blown."
Check the circuits around the Micropro-
0V
cessor on the HDMI PCB and replace
any faulty parts.
Broken fuse
Check the rectifier diode in
the rectifier circuit on the
secondary side, and check
the circuit for short circuits.
Replace any faulty parts.
Replace the fuse after repair.
YES
YES
See "1.2.Fuse is blown."
Is DC5V output even when
NO the connector (N1029)
supplying power from the
SMPS PCB to the HDMI
PCB is removed?
YES
Check for breakages and short
circuits in the circuits and parts be-
tween N1029 on the HDMI PCB and
the microprocessor power supply
and replace any faulty parts.
Are any parts not fully con-
nected in the connectors that
connect the PCBs?
YES
Connect the connectors correct-
ly.
Check for short circuits between
the regulator output terminal and
GND in the power supply stabili-
zation circuit. Replace faulty parts
if there is a short circuit.
77
NO
TO "6. SMPS"
(See 92 page)
NO TO "3.5. Protection
History Display Mode"
(See 49 page)