Samsung DVD-V440 Service Manual page 15

Alignment and Adjustments
(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 enve-
lope comes to an appropriate steady state within 3 seconds (as shown in Fig. 2-17).
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 seconds.
lag.
ENTRANCE SIDE —*
-_
t
¥
Fig. 2-17 Video Envelope Rising when Operation mode Changes from RPS to Play Mode
(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. 2-18.
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. 2-18.
In SP mode, (A) should equal (B).
If the head gap is wide, upper cylinder should be checked.
Fig. 2-18 Envelope Input and Output Level
(5) Tape Wrinkle Check
1) Run the T-160 (E-180) tape in the playback, FPS, RPS and Pause modes and observe tape wrinkle at
each guide.
2) If excessive tape wrinkle is observed, perform the following adjustments in Playback mode :
@ Tape wrinkle at the guide roller 5, T section : Linearity adjustment.
Tape wrinkle at tape guide flange : ACE head assembly coarse adjustment.
Samsung Electronics 2-13