AB International 410 Series 900 Service Manual

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AB International 410 Series 900 Service Manual

Extracted text from AB International 410 Series 900 Service Manual (Ocr-read)


Page 1

TROUBLESHOOTING GUIDE

1)

2)

II.

1)

2)

3)

A)

SYMPTOM

Unit appears normal
with pilot indicator
lights on, but:

Goes dead or becomes
distorted after a
period of play.

No output either channel.

Unit does not appear normal

in that:
Unit comes on for a
moment, then goes dead.

Unit will not turn off.

Unit will not turn on.

Blows line fuse
immediately.

A.
B.
C.

PROBABLE CAUSE

Overloaded output.

Insufficient cooling.

Same as #1 above.

No input signals.

No plug in accessory
or jumpers installed
in accessory Octal
sockets.

Gain controls turned
down. (front and/or
rear).

Faulty pOwer supply
component such as
transformer, bridge,
or wire.

DC latch fuse blown.
Defective channel amp
board.

Defective latch circuit.

Remote AC cord still
activated.

TRIAC defective.

AC control board.
Bad line fuse.

DC latch fuse blown.
TRIAC defective.
Loose or broken wire in
Faulty power supply
components.

Faulty channel amp
board.

A.
B.
C.

REMEDY

Reduce load to specified
value.

Add fan pack to increase
loading capacity.

See above.

Apply input.

Install accessory or
jumpers.

Turn up controls.

Replace faulty
component.

Replace fuse.
See procedure B.

See procedure C.
Turn off remote cord.

See procedure D.

See procedure F.

Replace line fuse.

See section II. 1, above
See procedure D.

Inspect for same and
Replace faulty power
supply components.

See procedure E.