14A1-W/A/S,14AG1-M/S
14A2-A/S,14AG2-M/S
TROUBLE SHOOTING TABLE (Continued)
CIRCUITS TO BE CHECKED:
E Tuner.NO PICTURE, NO SOUND
E PIF.
E Automatic Gain Control.
E (5V), (32V) Power Source.
Does the noise level increase at max.
Contrast, Brightness and Sound controls ?
Noise increases but no signal is
No snow noise.
received.
Does noise or signal appear at pin (40)
Check the tuner supply voltage LB must
of IC801 ?
be approx. 5V. BT must be approx, 32V.
And CH preset data check.
Does noise or Check IC801 and
signal appear at its related circuit.
pin (38) of IC801 ?
Check the tuner AGC
(TP201).
Does noise or
Check Q205 and
signal appear at
related circuit.
pins (23) and
Check pin (27) of (24)of IC801.
Check pin(38) of
IC801, Tuner and
IC801.
related circuit.
Check pin (1) of Check pin (37)of
SF201 and Tuner IC801 and related
related circuit. circuit.
CIRCUITS TO BE CHECKED:
E Sound system pins (28), (29)NO SOUND
and (44) of IC801.
E Sound Detector Circuit.
E Sound Switch and Att.
Does noise signal appear at Does signal appear at pins(28)
Control.
pin (44) of IC801 ?and (29) of IC801?
E Audio Output Circuit.
Check C356,
Does signal appear at pins
C359 and
(6) and (8) of IC301 ?CheckIC801.
peripheral circuit.
Check P304 connector of Check Q310, pins(4) and (6)
IC301 and peripheral circuit.of IC801 and peripheral
circuit.
E 31 |