Multi Troubleshooting; Power Troubleshooting Chart - Denon AVR-3808CI Service Manual

MULTI TROUBLE SHOOTING
1. POWER
1.1. Power not turn on
Power not turn on
YES
Are there any incomplete con-
Is the ON/STANDBY indicator NO nections in the connectors con-
on the front panel flashing red? necting between the various
circuit boards?
YES
Connect the connectors prop-
YES
erly.
NO
Is the fuse blown? Refer to Fuse is blown
YES
Is a DC 6V voltage being sup-
Does the power turn on when
NO plied from the 1U-3817 board
the POWER switch is turned
(CW122 pins 6 and 7) to the
off then back on?
microprocessor?
YES YES
Check the primary circuitry
Check the 1U-3804-2 board's
parts including the POWER
microprocessor periphery cir-
switch (for poor contacts, etc.),
cuitry and replace any defec-
and replace any defective
tive parts.
parts.
1.2. Fuse is blown
Fuse is blown
YES YES
Check for short circuits in the
Check for leaks or short cir-
rectifier diodes and circuitry of
cuits in the primary side parts,
the secondary side rectifying
and replace any defective
circuits, and replace any defec-
parts.
tive parts.
YES YES
After repairing, also replace the fuse.
Is there a short circuit between Correct the short
NO NO
the speaker terminals and the between the speaker and the
ground? ground.
YES
Check for damage in the
power amplifier circuitry parts
and replace any defective
parts.
Is a DC 6V voltage output
when the cord supplying the Check the parts from IC807 to
NO NO
power from the 1U-3817 board the primary circuitry
to the microprocessor replace any defective parts.
(CW122) is unplugged?
YES
Check the circuitry and parts
from CW122 on the 1U-3817
board to the microprocessor
for damage and short-circuits,
and replace any defective
parts.
YES
Check for short circuits in the
power stabilizer unit's regulator
output terminal and the
ground, and replace any defec-
tive parts.
YES
AVR-3808CI / AVR-3808 / AVC-3808
YES
circuit
NO
YES
NO
YES
NO
and
YES
YES
YES
17
NO NO
YES YES
NO NO
YES YES
YES YES
YES YES