Sharp 66AS-05H (serv.man8) Service Manual / Technical Bulletin ▷ View online
CTV990503
Month of Issue:
October 2001
Classification:
White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
Sharp Electronics (UK) Limited
Reference AVW280499/3
Revision 2
White – Carry out as required
Yellow – Carry out as required and whenever the unit comes in for service
Red – Carry out on all units
MODELS
66AS05H
DV5940H
DV6632H
Common faults on the 4BS-C Chassis
Fault
Reason
Possible Cause
Intermittent tripping
Poor line drive
Q606
Cramping
Vertical stage tollerance changes
C513 open circuit
Tripping every five seconds
Teletext processor supply pin
leaky
leaky
Teletext processor (note that removing the teletext
PWB will also result in tripping every five seconds)
Intermittent failure of the line
output transistor
output transistor
Line stage problems
Dry joints on the scanning coils connections (both
ends)
Disabling of protection circuit
To disable the protection circuit, you can remove the opto coupler IC701. However, do be aware that this may cause
failure of components if there is a catastrophic fault on the receiver.
failure of components if there is a catastrophic fault on the receiver.
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.
telephone number.
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