Sony RDR-VX521, Service Manual

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6-10E
(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. 6-13.
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. 6-13.
In SP mode, (A) should equal (B).
If the head gap is wide, upper cylinder should be checked.
Fig. 6-13 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 S, T section : Linearity adjustment.
◆
Tape wrinkle at tape guide flange : ACE head assembly coarse adjustment.
6-2-3 Reel Torque
1) The rotation of the capstan motor causes the holder clutch ass’y to rotate through the belt pulley.
2) The spring wrap PLAY/REV of holder clutch ass’y drives the disk reel S, T through gear idler by rotation of gear center ass’y.
3) Brake is operated by slider cam at FF/REW mode.
4) Transportation of accurate driving force is done by gears. (Gear Center Ass’y)
Note:
If the spec. does not meet the followings specifications, replace the holder clutch ass’y and then recheck.
< Table 6-1 >
MODE TORQUE g/cm GAUGE
PB 42
±
11 Cassette Torquemeter
RPS 145
±
30 Cassette Torquemeter
A
B