Read Sharp 37AT-25H (serv.man12) Technical Bulletin online
Sharp Electronics (UK) Limited
Reference AVW120199/2
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
CTV990114
Month of Issue: January 1998
Classification: White
TELEVISION TECHNICAL BULLETIN
Page 1 of 1
MODELS
37AM12H
37AM23H
37AT25H
51AT15H
SYMPTOM
ACTION
No teletext
Decrease R1072 to 470k or replace D1002
Teletext jitters
Fit a 220nf capacitor in parallel with R521 (see Technical Bulletin CTV970808)
Unable to release child lock
Refer to Technical Bulletin CTV970208.
Intermittent sound and picture
Refer to Technical Bulletin CTV970206.
or ragged verticals
Will not select tuning menu
Set NVM location 0B to read B8 or replace D1002.
Tuning will not lock
Dry joint on L205 or AFT VCO adjustment incorrect.
Blank raster of picture fades
D1002.
Line fold over
D1002.
Repeated failure of Q602
Replace C713 with a 105
o
C type and replace D1002.
Stuck in standby
Noise on 5V supply, replace D709 (may not read faulty).
Frame cramping
Replace D709, C713 and check semiconductors in the frame stage.
Lack of height
R521 and adjust in service mode.
Excessive height
R508.
Drifting off tune
Refer to Technical Bulletin CTV970508.
No remote control functions
Q510. Check other components in frame stage
and/or front buttons not
operating
operating
If you have a fault to add to the above list, please do no hesitate to contact Sharp Technical Support using the
Hot Line telephone number.
Hot Line telephone number.
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