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Reference AVW280499/1

Revision 1

White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units

Month of Issue: May 1999

        Classification:          White

 

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Intermittent tripping

Poor line drive signal

Q606

Tripping every five seconds

Teletext processor supply pin
leaky to ground

Teletext processor (note that removing the teletext
PWB will also result in tripping every five seconds)

Intermittent start up
Blank picture or intermittent blank
picture

Data problems

D708 (may not read faulty), NVM (IC104) and/or
EPROM (IC100)

Intermittent start up

Supply slow to come up

R735 - in some early chassis two resistors (in
parallel) where fitted in series with D708, remove
these and replace with a SOC2500 fuse (2.5A)

Tripping

Power supply slow to start

C702 and/or C712 dry jointed

Intermittent sound (Single chip
NICAM PWB)

Erractic crystal oscillation

Change crystal and remove C1330 and C1331

Poor or no east/west correction

L604 short circuit

L604

Dead set

Line stage problems

Check C619 and associated components
Dry joints on the scan coil connectors (both ends)

Note that the NVM (IC104) and EPROM (IC100) are different depending upon the type of NICAM PWB fitted.  Please
order the correct IC for the correct set, otherwise the receiver may fail to operate.

If you have a fault to add to the above list, please do no hesitate to contact Sharp Technical Support via the Hot Line
telephone number.