Troubleshooting Tables - Sharp 21HM-10F Service Manual

Abnormal
Check R701 Q701.
and IC701
Abnormal
Check D758,IC702,IC753
and D762.
Normal
Check R615.
D1001 turns on
brightly and darkly.
(Bus error)
See many often D1001
flashes in red.
This indicates which IC to
check up.

TROUBLESHOOTING TABLES.

NO RASTER
Check F701.
Normal
Check T701 pin16 voltage.
(Approx. 290V at 220V AC)
Normal
Check Secondary Main+B.
(Approx. 110V)
Check CRT connector K1-
K5 bias.
Normal Abnormal
Check
C878.
NVM
(IC1002)
TV PROCESSOR
(IC801)
TUNER
(TU201)
35
Blown out.
Replace the fuse.
The fuse is again blown out.
Check IC701,D701,D702,
D703,D704 and C705.
Normal
YES
D1001 (Power LED Bright Red)
turns on.
NO
D1001 (Power LED Dark Red)
Check turns on
IC801.
Checking the
protector circuit.
21HM-10F
NO