14BM2, 14BM2S/G
20BM2, 20BM2S/G
21BM2, 21BM2S/G
(Continued)
Check C503, C507 and power supply circuit.
16-2
Readjust Vertical Size. (Bus Data)
Vertical Linearity and Size are abnormal.Check R503, R504, R506, R513, C517 and D501.Check IC501 Bias pins (3) and (6).
Check pins (16), (17) and (34) of IC801.
NO VERTICAL SCAN
NEITHER VERTICAL NOR
AND VERTICAL LINEARITY
DEFECTIVE VERTICAL AMP.
NormalAbnormal
HORIZONTAL SYNCHRONIZATION
Check pins (21) and (22) of IC801.
TROUBLE SHOOTING TABLE
Sync. Separator Circuit.
CIRCUIT TO BE CHECKED:
YES
NO
Check IC801.
Check IC801 and its related circuit.Check Q205 and its related circuit. Check pin (37) of IC801 and related circuit.
YESYES
YES
No snow noise.
(Continued)Check Q301, pins (4) and (6) of IC801 and peripheral circuit.
Does signal appear at pin (28) of IC801?
NONONO
Does signal appear at pin (40) of IC801 ?
Does noise or signal appear at pin (38) of IC801 ?Check C356 and peripheral circuit.
Does noise or signal appear at pins (23) and (24) of IC801.Check pin (1) of SF201, Tuner and related circuit.
NO
NO
16-1
NO SOUNDYES (Signal)YES
Does the noise level increase at max. Contrast, Brightness and Sound controls ?
NO PICTURE, NO SOUND
Does signal appear at pin (44) of IC801 ?Does signal appear at pins (6) and (8) of IC301 ?Check P301 connector of IC301 and peripheral circuit.
Abnormal
Check pin (27) of IC801, Tuner and related circuit.
Normal
Check the tuner AGC at TP201.
TROUBLE SHOOTING TABLENormal
Noise increases but no signal is received.
Check the tuner supply voltage LB must be approx. 5V. BT must be approx. 33V and CH preset data check.Check pin (38) of IC801.
Sound system pins (28) and Sound Detector Circuit. Sound Switch and Att. Audio Output Circuit.
CIRCUITS TO BE CHECKED: E (44) of IC801. EE Control. E
CIRCUITS TO BE CHECKED: Tuner. PIF. Automatic Gain Control. (5V), (33V) Power Source.
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