21GF30
21GF50
(Continued)Check IC501.
E-40
Check IC501 bias.
Readjust vertical size. (Bas Data)
Vertical linearity and size is abnormal.Check R504, R506, R513 and C517.
Check pins(33) and (34) of IC801.
NO VERTICAL SCAN
NEITHER VERTICAL NOR
AND VERTICAL LINEARITY
DEFECTIVE VERTICAL AMP.
HORIZONTAL SYNCHRONIZATION
Check C506 and C507.
TROUBLE SHOOTING TABLE
Sync. Separator Circuit.
CIRCUIT TO BE CHECKED: E
Check IC401 and related circuit.
Check IC801 and its related circuit.Check pin (37)of IC801 and related circuit.
No snow noise.
Check IC401 and its peripheral circuit.
(Continued)
Does noise or signal appear at pin (40) of IC801 ?
Does noise or signal appear at pin (38) of IC801 ?Does noise or signal appear at pin (23) and (24) of IC801 ?Check pin (1) of SF201, Tuner and related circuit.
Check IC302 and peripheral circuit.E-39
NO SOUND
Does the noise level increase at max. Contrast, Brightness and Sound controls ?
NO PICTURE, NO SOUND
Does noise signal appear at pins (3) and (22) of IC305 ?Does signal appear at pins (2) and (5) of IC302 ?Check Speaker.
Check pin (27) of IC801, Tuner and related circuit.
TROUBLE SHOOTING TABLE Check the tuner AGC at TP201.
Noise increases but no signal is received.
Check pin(38) of IC801.
Check the tuner supply voltage LB and HB must be approx. 5V. BT must be approx. 32V. and CH preset data check.
Tuner. PIF. Automatic Gain Control. (5V), (32V) Power Source. Sound Detector Circuit. Sound Switch and Att. Audio Output Circuit.
CIRCUITS TO BE CHECKED: EEEECIRCUITS TO BE CHECKED: EE Control. E
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