User Guide

38
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Is the ON/STANDBY
indicator on the front panel
ashing red?
Check for leaks or short
circuits in the primary side
parts, and replace any
defective parts.
Does the power turn on
when the POWER switch
is turned off then back on?
Check the primary circuitry
parts including the
POWER switch (for poor
contacts, etc.), and replace
any defective parts.
Is the fuse blown?
Power not turn on
Fuse is blown
Are there any incomplete
connections in the
connectors connecting
between the various circuit
boards?
Check for short circuits
in the rectier diodes and
circuitry of the secondary
side rectifying circuits,
and replace any defective
parts.
After repairing, also replace the fuse.
Is a DC 5V voltage being
supplied from the
8U-210078-1 PWB unit
(CX191 pin 18 and 19) to
the μcom?
Check the 8U-210079-1
PWB unit's μcom periphery
circuitry and replace any
defective parts.
Connect the connectors
properly.
Refer to Fuse is blown
Is there a short circuit
between the speaker
terminals and the ground?
Check for short circuits
in the power stabilizer
unit's regulator output
terminal and the ground,
and replace any defective
parts.
Is a DC 5V voltage output
when the cord supplying
the power from the
8U-210078-1 PWB unit
to the μμμμ (CX191) is
unplugged?
Check the circuitry and
parts from CY191 on the
8U-210078-1 PWB unit to
the μcom for damage and
short-circuits, and replace
any defective parts.
Check for damage in the
power amplier circuitry
parts and replace any
defective parts.
Correct the short circuit
between the speaker and
the ground.
Check the parts from IC***
to the primary circuitry
and replace any defective
parts.
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TROUBLE SHOOTING
1. POWER
1.1. Power not turn on
1.2. Fuse is blown