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YES
YES YES YES
NO
NO
NO
Is the ON/STANDBY
indicator on the front panel
fl ashing red?
Does the power turn on
when the POWER switch is
turned off then back on?
Check the primary ciruitry
parts including the POWER
switch(for poor contacts,
etc.), and replace any
defective parts.
Check the microprocessor
periphery circuitry and
replace any degective parts.
Check the circuitry and parts
from BN43 on the MAIN
B'd to the microprocessor
for damage and short-
circuits,and replace any
defective parts.
Is a DC 5V voltage being
supplied from the MAIN B'd
to the microprocessors?
Is a DC5V voltage output
when the cord supplying the
power from the MAIN B'd to
the microprocessor(BN43)
is unplugged?
Is the fuse blown?
Refer to Fuse is blown.
Power not turn on.
Are there any incomplete
connections in the
connectors connecting
between the various circuit
boards?
Correct the short
circuit between the
speaker and ground.
Connect the connectors
property.
Is there a short circuit
between the speaker
terminals and the ground?
Check for damage in the
power amplifi er circuitry
parts and replace any
defective parts.
Check the parts from
IC45 to the primary
circuitry and replace
any defective parts.
YES
YES
YES
NO NO
NO
NO
TROUBLE SHOOTING
1. POWER
1.1. Power not turn on
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
rectifi er 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