Denon AVR-4520, Service Manual

Page: 103 / 281

103
TROUBLE SHOOTING
1. POWER
1.1. Power not turn on
YES YES
YES
NO
NO
YES
NO
NO
0.6V or -0.6V
When the power turned on,
does the ON/STANDBY
indicator on the front panel
flashing green?
Is the fuse blown?
About 10 seconds later,
does the ON/STANDBY
indicator on the front panel
turn lighting green ?
Check voltage of N6013(9-
10PIN,30-31PIN) of SPK
B'D while the ON/STANDBY
indicator is flashing green.
Pull out connector (N6013) of
SPK UNIT, and check "
3.5.
Errors checking mode ".
(Refer to 63 page.)
Power not turn on.
Is the fuse blown?
When the power turned on,
does the ON/STANDBY
indicator on the front panel
flashing red?
Is a DC 5V voltage being
supplied from the SMPS B'D
(CN6502) to the HDMI B'D?
Refer to 1.2.Fuse is blown .
Refer to 1.2. Fuse is blown .
Check circuitry and parts from N6013 on
the SPK B'D to the µ-com for damage
and shortcircuits, and replace any
defective parts.
Check " 3.5. Errors
checking mode ".
(Refer to 63
page.)
Are there any incomplete
connections in the connectors
connecting between the
various circuit boards?
Is a DC 5V voltage output
when the cord supplying the
power from the SMPS B'D
to the HDMI B'D (1808) is
unplugged?
Check µ-com periphery
circuitry of HDMI B'D and
replace any defective parts.
Check circuitry and parts from
CN903 on the HDMI B'D to the
µ-com power supply for damage
and shortcircuits, and replace
any defective parts.
Connect the connectors properly.
To troubleshooting
6. SMPS .
(Refer to 119
page.)
NO
YES
YES
0V
YES NO
NO NO
Check for leaks or short
circuits in the primary side
parts, and replace any
defective parts.
Fuse is blown
Check for short circuits in the
rectifier diodes and circuitry of
the secondary side rectifying
circuits, and replace any
defective parts.
After repairing, also replace the fuse.
Check for short circuits in
the power stabilizer unit's
regulator output terminal and
the ground, and replace any
defective parts.
1.2. Fuse is blown
YES