4·3. Other Mechanical Adjustment Procedures; Measurement And Adjustment Of Back Tension - Panasonic AG-7350 Series Service Manual

.....
z
w
:::E
.....
CJ)
::::»
-,
c
c(
..J
c(
0
z
c(
:I:
0
w
:::E
4-3. OTHER MECHANICAL ADUSTMENT PROCEDURES
4-3-1. MEASUREMENT AND
ADJUSTMENT OF BACK TENSION
<<TOOL>>
Back Tension Meter ; VFK0132
VHS Cassette Tape (180 min. tape not S-VHS tape)
A FWD Tension Adjustment
<<SPEC>>
23g to 27g
1. Play back the cassette tape from the beginning and wait
until the tape movement get the stabilization. (for ap-
prox. 10 to 20 seconds)
2. Pull the Impedance Roller in the direction indicated the
arrow in Figure M28 secure it with a piece of adhesive
tape.
3. Insert the Back Tension Meter into the path of a tape,
and measure the back tension.
P2
Probes of Gauge
Figure M28 Measurement of Back Tension
4. If it is out of specification, replace the Tension spring.
4-10
B. Rev Tension Adjustment
<<SPEC>>
30g to GOg
1. Play back the beginning of E 180 VHS cassette in the
Reverse play mode and wait for approx. 1 0 to 20 sec-
onds so that the tape movement is stabilized.
2. Pull the Impedance Roller in the direction indicated by
the arrow in Figure M28 secure it with a piece of adhe-
sive tape.
3. Insert the Back Tension Meter Into the path of a tape,
and measure the back tension.
4. If it is out of specification, replace the Tension spring .
<<NOTE>>
While measuring, make sure that the three probes of the meter
are all in good contact with the tape.
As the tension meter is vel}' sensitive, we recommend taking 3
separate readings.
Tension Spring
Figure M29