Denon AVR-3808CI Service Manual page 10

Q Q
MULTI TROUBLE SHOOTING 3 7 6 3 1 5 1 5 0
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
plied from the 1U-3817 board
NO
the POWER switch is turned off
(CW122 pins 6 and 7) to the
then back on?
microprocessor?
YES YES
T E
L 1 3 9 4 2 2 9 6 5 1 3
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 circuits rectifier diodes and circuitry of
in the primary side parts, and the secondary side rectifying
replace any defective parts. circuits, and replace any defec-
tive parts.
YES YES
After repairing, also replace the fuse.
w w w
.
http://www.xiaoyu163.com
Is there a short circuit between Correct the
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 power Check the parts from IC807 to
NO NO
from the 1U-3817 board to the the primary
microprocessor (CW122) is replace any defective parts.
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 regula-
tor output terminal and the
ground, and replace any defec-
tive parts.
YES
x a o u 1 6 3
y
i
http://www.xiaoyu163.com
8
YES
short circuit
NO
YES
NO
YES
NO
circuitry and
YES
Q Q
3 7 6 3 1
YES
YES
c o
.
10
AVR-3808CI / AVR-3808 / AVC-3808
9 2 4 9 8
NO
YES YES
NO
YES YES
5 1 5 0 8 9 2 4 9
YES YES
YES YES
m
2 9 9
NO
NO
8 2 9 9