Mechanicaladjustment Procedures; Tension Postposition Adjustment; Backtensionadjustment - Panasonic REV-1 Service Manual

5. MECHANICAL ADJUSTMENT
PROCEDURE
5-1. Tension post position adjustment
Equipment required: Hex. Wrench (VFK0326)
Specification: 50.5* 1.5 mm
(1)
(2)
(3)
(4)
—
Disconnect the AC plug.
Remove the TOP PLATE.
Turn the LOADING MOTOR until the loading
completes.
Adjust the hole of Tension Band Fastener by Hex
Wrench until the distance between the Tension
Post and the center of Supply reel table is
50.5tl.5 mm as shown in Fig. Ml.
50.5*1 .5mm
<
\
table
Fig. Ml
5-2.
Back tension adjustment
Equipment required:
Back Tension Meter (VFKOI32)
VHS Cassette tape (180 minutes tape: PAL)
VHS Cassette tape (120 minutes tape: NTSC)
Specification: 22.5–27.5g
(1)
(2)
Playback the cassette tape from the beginning
and wait until the tape movement get the stabili-
zation. (for approx. 10–20 seconds)
Insert the Back Tension Meter into the path of a
tape, and measure the back tension to be within
specification as shown in Fig. M2.
S Inclined post
S2 Post=..+
Probes of
Gauge
\
Tension
Post
Fig. M2
(3) If it is out of specification, change the spring
notch as shown in Fig. M3.
Tension spring
, Supply spring arm
"Spring notch
Fig. M3
24