Trouble Shooting Table - Sharp CX68KF5 Service Manual

TROUBLE SHOOTING TABLE

NO VERTICAL SCAN
Normal Check the voltage at pin (6) of IC1501.
Check vertical trigger pulse at pin (26) of IC800.
Normal Abnormal
Check IC1501 and Check IC800 and its
related circuits. peripheral parts.
16-1
TROUBLE SHOOTING TABLE
Abnormal
Check CRT connector (KY), (H) bias.
Normal
Check D1576 and R1576.
Check IC850.
NO RASTER
Yes
Is pin (10) of IC700 in "L" level ?
Abnormal
Does D1200 (Power LED) turn on?
Check R1651,
IC800 and their
peripheral parts.
D1200 (Power LED) turn on and off.
(Bus error)
Check
protecter circuit
and its related
parts pin (2) of
IC1000 vertical
pulse.
See many often
D1200 flashes
in red.
This indicates
A
which IC to
check up.
16-2
(Continued)
No
No Yes (RED)
Does horizontal circuit
momentary oscillate?
Yes No
Check the
power circuit
consisting of
IC700, Q700
IC750 and
IC602.