C-1. Bad playback quality (1) D. No broadcasting signal received
Noise appears on the playback screen. No broadcasting signal received
YES Is noise diminished by tracking adjustment. YES Noise band is trembled up and down? YES Is there CTL pulse at IC501 pin#97? YES Is there problem in CTL Input Check IC501. circuit and amplifier. YES Check C510,R545~R547 IC 501 pin #91, 92, 98. Is there Video output at P100 pin#1? YES Check Video Buffer Q670, Q671 NO Check P100 NO Is the height of CTL HEAD normal? No dust? NO Re-adjust the height of AC HEAD. Remove the dust. YES Is Video Signal input at IC501 pin#56? NO Check IC301. NO Noise appears on the screen even though changing tape. YES NO Re-adjust PATH. Is the output at IC501 pin# 61(CLK), 60 (DATA) normal? YES Is SIF,Video output at TMI(RF101) pin#16,19 normal? YES NO Check TMI (RF101) Block. NO Check IC 501.
Re-adjust PATH.
C-2. Bad playback quality (2)
Noise appears on the Full playback screen.
YES NO Are SW pulse and HA SW normal? Are there SW, HA SW pulse at IC501 pin #16, 18? YES Check PCB Pattern. NO ENVE Wave at P502 pin #4? YES Check VIDEO circuit. Check HEAD AMP connector and HEAD. NO Check IC501. Recheck step B-1 (Bad playback quallty (1)).
