21GT-22
(Continued)Check IC501.
Check IC501 bias. 16-2
Readjust vertical size. (Bus Data)
Check pins(16), (17) and (34) of IC801.Vertical linearity and size abnormal.Check R501, R521, R503, R512, R533 and C533.
NO VERTICAL SCAN
NEITHER VERTICAL NOR
AND VERTICAL LINEARITY
DEFECTIVE VERTICAL AMP.
HORIZONTAL SYNCHRONIZATION
Check C505 and C509.
TROUBLE SHOOTING TABLE
Sync. Separator Circuit.
CIRCUIT TO BE CHECKED: E
Check IC801.
Check IC801 and its related circuit.Check Q253, Q254 and related circuit.
No snow noise.Check Q321, pins(4) and (6) of IC801 and peripheral circuit.
Does signal appear at pins(28) of IC801?
(Continued)
Does noise or signal appear at pin (40) of IC801 ?
Does noise or signal appear at pin (38) of IC801 ?Check pin (1) of SF201, Tuner and related circuit. Check pin (37) of IC801 and related circuit.Check C356 and peripheral circuit.
16-1
NO SOUND
Does the noise level increase at max. Contrast, Brightness and Sound controls ?
NO PICTURE, NO SOUND
Does noise signal appear at pin (44) of IC801 ?Does signal appear at pins (2) and (4) of IC301 ?Check P302, IC301 and peripheral circuit.
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 must be approx. 5V, BT must be approx. 32V. and CH preset data check.
Tuner. PIF. Automatic Gain Control. (5V), (32V) Power Source. Sound system pins (28) Sound Detector Circuit. Sound Switch and Att. Audio Output Circuit.
CIRCUITS TO BE CHECKED: EEEECIRCUITS TO BE CHECKED: E and (44) of IC801. EE Control. E
16 |
ACEC
