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1-7-2. Reel Torque Check
(1) Reel torque
I. REVIEW mode (supply side)
Poor torque may not wind the tape. On the other
hand, excessive torque will cause damage to the
tape during REVIEW mode.
Record/Playback mode (take-up side)
Too little torque does not rewind the tape to the
end. If too large torque, the tape may be stretched
by excessive tension.
Inspection
Rewind the torque cassette to the end, then check
the torque values shown below:
Review
15.95 + 3.65 mNem
(162.5 + 37.5 gecm)
Record/Playback
6.85 + 2.45 mNem
(70 + 25 gecm)
For checking method, refer to the following item
(2).
(2) Reel torque and back tension check
I. First, record a TV broadcast program on the entire
torque cassette tape (KT-300NR) in the SP mode.
. Load the torque cassette tape (KT-300NR) in the
VTR and feed it forward until the end of the tape,
before proceeding with measurement.
Set the VTR to the REVIEW mode and feed the
tape for about 15s, and then make sure the take-up
torque described above is obtained while observing
the left torque meter.
After completion of step 3), feed forward to tape
start position and set the VTR to the PLAY mode
and feed the tape for about 30s. Read the right
torque meter and check the torque described above
is obtained.
. If the review torque and playback torque are out of
limit, replace the clutch assembly.
. When the S reel table assembly, the T reel table
assembly and the idle arm assembly are replaced,
perform the reel torque check.
2-35
<Precautions for Use of Torque Cassette (KT-300NR)>
I. Before loading a torque cassette in a VTR, always
remove tape slack. The tape slack can be removed
by rotating the reel to its take-up direction. (The
tape tends to slack when there is no reel brake
actions.)
When the torque cassette is loaded, confirm
followings:
¢ Make sure the tape does not ride up or over the
No. 8 cap. If it does, do not eject the tape but
return the tape to its correct position, taking care
not to damage the tape.
¢ Make sure the tape is not slackened. If slack-
ened, operate the VTR in FF or REW mode and
then stop the tape. Then make sure the tape is
not slackened again.
¢ After above confirmation, proceed to the reel
torque adjustment and confirmation.
. Caution for removal of torque cassette
¢ When removing the torque cassette from the
VTR, set the VTR to the STOP mode and wait
for several seconds. Then, make sure the tape is
not slackened. Push the EJECT button to
remove the cassette.
. If the previous precautions |), 2) and 3) are not
performed properly, the tape may be damaged and
correct measurements can not be performed.
. Do not use worn out or damaged tape, if used they
may damage video heads on the cylinder. In sucha
case always replace the tape with a new one. The
replacement tape is of E-180, 10 m in length.
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