Denon AVR-X4100, Service Manual

Page: 101 / 236

0.6V or -0.6V
0V
TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
YES
YES
YES
YES
NO
NO
YES
NO
NO
Does the power indicator
on the front panel flash 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
approximately 10 seconds?
Check the voltage of pins
1-7 of CN704 on the DIGITAL
PCB while the power display
is flashing in green or white.
Remove the connector (CN971) of the SPK PCB.
Check the " 3.6. Protection history display mode "
(See 71 page )
The unit does not power on
Has a fuse broken?
Does the power indicator on
the front panel flash in red
when the power is turned on?
Is DC5V being supplied
from the SMPS PCB (BN903)
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.
TO " 3.5.Protection
History Display Mode "
(See 71 page )
Are any parts not fully con-
nected in the connectors that
connect the PCBs?
Is DC5V output even when
the connector (CN903)
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 CN903 on the DIGITAL
PCB and the microprocessor power
supply and replace any faulty parts.
Connect the connectors correct-
ly.
TO " 6.SMPS "
(See 115 page )
NO
YES
YES
YES
NO NO
NO NO
YES
Check for leaks and short
circuits in the parts on the
primary side. 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.
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.
1.2. Fuse is blown
Has a fuse broken?
101