Sharp 21F-PA330I Panduan Servis - Halaman 13
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TROUBLE SHOOTING FLOWCHART
NO RASTER
Check F701.
Check T701 pin (17) voltage
(Approx. 310V at 220V AC)
Check NR701.
Check Secondary Main+B
(Approx. 125V)
Check CRT connector K-
Check D751, IC702 and IC703.
wire and the signal on it.
Check 185V
Check
Bias on
IC801.
CRT board.
Does horizontal circuit
oscillate ?
Check Q601 and Q602.
13-1
Blown out.
Replace the fuse.
The fuse is blown out again.
Check IC701, D701 and
C705.
Check Q752 for 8V regulator
circuit and Q751, Q754 for
5V regulator circuit.
Checking the
protector circuit.
TROUBLE SHOOTING FLOWCHAT (Continued)
CIRCUITS TO BE CHECKED:
NO PICTURE, NO SOUND
» Tuner.
» PIF.
» Automatic Gain Control.
» (5V), (32V) Power Source.
Does the noise level increase at max.
Contrast, Brightness and Sound controls ?
Noise increases but no signal is
received.
Check the tuner supply voltage LB must
approx. 5V. BT must be approx. 33V.
And check the CH preset data.
Check the tuner AGC at
TP201.
Check pin (59) of
Check pin(58) of
IC801, Tuner and
IC801.
related circuit.
CIRCUITS TO BE CHECKED:
NO SOUND
» Sound Detector Circuit.
» Sound Switch and Att.
Control.
» Audio Output Circuit.
Does signal appear at pins
(10) and (23) of IC3501 ?
Does signal appear at pins
(6) and (8) of IC301 ?
Check Speaker.
No snow noise.
Does noise or signal appear at pin (41)
of IC801 ?
Does noise or
Check IC801 and
signal appear at
related circuit.
pin (58) of IC801 ?
Does noise or
signal appear at
Check IC401 and
pin (63) and (64)
related circuit.
of IC801 ?
Check pin (1) of
Check pin (60) at
SF201, Tuner and
IC801 and related
related circuit.
circuit.
Check TV sound from pin (54)
of IC801.
Check IC301 and
peripheral circuit.
13-2