Samsung SV-613X Service Manual page 138

Alignment and Adjustment
2-2-3 Check Transitional Operation from RPS to Play
Check transition from RPS mode to play mode : Using a pre-recorded SP tape, make sure the entry side of
envelope comes to an appropriate steady state within 3 seconds (as shown in Fig. 2-9). If the envelope waveform
does not reach specified peak-to peak amplitude within 3 seconds, adjust as follows :
1. Make sure there is no gap between the supply roller lower flange and the tape.
If there is a gap, adjust the supply guide roller again.
2. Change operation mode from the RPS to the play mode (again) and make sure the entry side of envelope rises
within 3 second.
Fig. 2-9 Video Envelope Rising when Operation mode Changes from RPS to Play Mode
2-2-4 Envelope Check
1. Make recordings on T-120 (E-120) and T-160 (E-180) tape. Make sure the playback output envelope meets the
specification as shown in Fig. 2-10.
2. Play back a self recorded tape (recording made on the unit using with T-120, E-120). The video envelope should
meet the specification as shown in Fig. 2-10. In SP mode, (A) should equal (B).
If the head gap is wide, upper cylinder should be checked.
2-6
ENTRANCE SIDE
ENVELOPE
A
Fig. 2-10 Envelope Output and Output Level
B
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