Toshiba V-854G Serviceanleitung Seite 43

1-7-2. Reel Torque Check
(1) Reel torque
1. 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.
ind
3. Inspection
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
1. First, record a TV broadcast program on the entire
torque cassette tape (KT-300NR) in the SP mode.
2. Load the torque cassette tape (KT-300NR) in the
VTR and feed it forward until the end of the tape,
before proceeding with measurement.
3. 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,
4. 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.
6. When the S reel table assembly, the T reel table
assembly and the idle arm assembly are replaced,
perform the reel torque check.
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by rotating the reel to its take-up direction. (The
tape tends to slack when there is no reel brake
actions.)
tw
. When the torque cassette is loaded, confirm
followings:
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.
3. Caution for removal of torque cassette
« When removing the torque cassette from the
4. If the previous precautions 1), 2) and 3) are not
performed properly, the tape may be damaged and
correct measurements can not be performed.
5. Do not use worn out or damaged tape, if used they
may damage video heads on the cylinder. In such a
case always replace the tape with a new one. The
replacement tape is of E-180, 10 m in length.
1-7-3. Tape Transport System
The tape transport system has been precisely adjusted in
the factory, so no check and alignment are necessary
except the followings:
« Noises observed on the screen
« Tape damage
« Parts, shown in the adjustment procedures for the tape
transport system were replaced.
Electrical signal output terminal required for adjustment
differs depending upon the models. Refer to the test point
location in the Electrical Adjustment Section.
S stant guide
S impedance roller.
S guide roller
FE head
No. 3 guide
Tension lever& "
(Released at REVIEW,
T slant guide
A,
(1) Location of tape transport adjustment
<Adjustment reference>
Lower flange height of No. 8 guide is used as the basic
reference for the transport adjustment. To keep height of
the No. 8 guide. do not apply excessive force onto the
main base to prevent the main base from deformation.
Rectangles shown in Figs. 7-3-1, 7-3-2 show the adjusting
locations.
o>
T impedance roller
ACE head
ACE
main base
ACE head position
adjusting screw
Pinch roller
No.9 guide
(Pulled out at
REVIEW mode)
Capstan
No. 8 guide
ACE head position adjusting slit
(Insert a slot type screwdriver.)
Fig. 7-3-1 Tape travel diagram
Tension pole % FF/REW mode)
ACE adjusting screw ~
Tilt
Note:
Azimuth
There is S,T impedance roller .
depending on models. Height
Cylinder
S$ slant guide
Tension pole en
No. 3 guide ety
FE head
S guide roller
T slant guide
[sete
/
Capstan
Yd No. 9 guide
\ elas Pinch roiler
No. 8 guide
T guide roller
Fig. 7-3-2 Location of tape transport adjustment
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