Trouble Shooting; Power - Denon AVR-X4100W 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
1-7 of CN704 on the DIGITAL
PCB while the power display
is flashing in green or white.
0.6V or -0.6V
Remove the connector (CN971) of the SPK PCB.
Check the "3.6. Protection history display mode"
(See 71 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
NO
the 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 (BN903)
to the DIGITAL PCB?
YES
Check the circuits around
the Microprocessor on the
DIGITAL PCB and replace
any faulty parts.
YES
Has a fuse broken?
YES
YES
See "1.2.Fuse is blown."
Check the circuits around the Micropro-
0V
cessor on the DIGITAL 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 (CN903)
supplying power from the
SMPS PCB to the DIGITAL
PCB is removed?
YES
Check for breakages and short
circuits in the circuits and parts
between CN903 on the DIGITAL
PCB and the microprocessor power
supply and replace any faulty parts.
Are any parts not fully con-
nected in the connectors that
NO
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.
101
NO
TO "6.SMPS"
(See 115 page)
TO "3.5.Protection
History Display Mode"
NO
(See 71 page)