Tension/Torque Checks - Hitachi VT-FX8000E Service Manual

Checking the flatness and fluctuations of FM
output / waveform diagrams
1) Activate autotracking.
2) Finely adjust the voltage level range of the
oscilloscope so the FM output is set to
4 graduations.
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4 GRADUATIONS
3-6. Tension/Torque Checks
urpose: It 1s necessary to chee!
the tension, torque, compression strengt
3) Adjust the tracking so the maximum amplitude
of the FM output is set to 3 graduations.
4) Check that the minimum amplitude is more than
2 graduations at this time.
J
GRADUATIONS GRADUATIONS
5) Check that the difference between the maximum
and minimum level fluctuations is less than
at the tape take-up and
moving sections to smooth the running of tape and satisfy the basic performance of the VCR,
Perform this che
Test equipment
+ Torque gauge
* Torque gauge adapter
jigs
if the running of tape is not smooth or the tape speed is abnormal.
tate of VC
«Set the YOR to each operation mode without
inserting a cassette. (See page 4-1)
Stem VCR operation mode leasured reel Weasured value
fan rake : ue Hee late, Supply & take-up ree! = Ei
lack removal torque Inloading _ upply ree a gc
Fast forward torque Fast forward Take-up reel Zoom or more
Rewind torque Rewind Supply reel 400 g +cm or more
Take-up torque Playback Take-up reel 45 ~ 75g «cm
Back-tension torque Fast _forward/Rewind Supply & take-up reels 5 ~ 20 ge :cm
ae back~tension Playback Supply reel 25 ~ 36g +m
Reverse search torque Reverse search Supply ree! 95 ~ 250 g «cm
Reverse play torque Reverse play Supply reel 95 ~ 150 2 +cm
Slow torque Slow Take-up reel 30_~ 75g -om
Take-up brake torque Reverse search Take-up reel 66 ~ 100g -cm
Checking procedure
Mount the. torque gauge and torque gauge adepter
and hold the' torque gauge with your fingers for
measurement.
Note : Measure in the loading stop-2 state.
(See next page.)
Adjustment diagram
TORQUE GAUGE
TORQUE GAUGE ADAPTER
REEL DISK