Technics SUCH 900 Schematics

User Manual: Technics-SUCH-900-Schematics

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TechInfo Sheet

fax: 01344 853689

Audio Visual

email: av.technical@mail.panasonic.co.uk

Product Group: HiFi Mini
Date: 14/12/99
Subject: Unit Cuts Out

Model: SU-CH900
Revision No: 01

Document No: 01

SYMPTOM:

The unit turns off unexpectedly during normal operation and an
indication of “E“ lights on the main display.

CAUSE:

One of the following may cause the cut out.
1.
2.
3.

REMEDY:

1.

2.

3.

A defective fan motor (coil shorted, disconnected or clogged
commutator).
A faulty detector circuit (short or disconnection).
Smoothing capacitor (C571) used in fault detector circuit of
output IC is possibly dry joint. The problem is liable to occur
when the output is high.
Defective fan motor: Replace the fan motor Part No. SYE1128-4
unless the resistance across both ends of the coil is between 20
and 30 Ohms.
Incorrect action of fan motor circuit: Mount a capacitor across
both ends of the fan motor.

Poorly soldered C571, re-solder this capacitor.

NB Due to the nature of the problem, it is recommended that all of
the three remedies above are carried out simultaneously

Panasonic CS U.K.

Document No: 01
Model: SU-CH900
1



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