Samsung CFTD2083TX/SMS, Service Manual

Page: 34 / 102

Disassembly and Reassembly
3-24 Samsung Electronics
3-5-3 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. 3-5-7).
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.
ENTRANCE SIDE ENVELOPE
Fig. 3-5-7 Video Envelope Rising when Operation mode
Changes from RPS to Play Mode
3-5-4 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. 3-5-8.
2) Play back a self recorded tape (recording made
on the unit using with T-120 (E-120).
The video envelope should meet the specifica-
tion as shown in Fig. 3-5-8.
In SP mode, (A) should equal (B).
If the head gap is wide, upper cylinder should
be checked.
A
B
Fig. 3-5-8 Envelope Output and Output Level
3-5-5 Tape Wrinkle Check
1) Run the T-160 (E-180) tape in the playback, FPS,
RPS and Pause modes and observe tape wrin-
kle 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.
3-6 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 idle
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.
MODE TORQUE g/cm GAUGE
PB 42± 11 Cassette Torquemeter
RPS 145 ± 30 Cassette Torquemeter
<Table 2-1>