Measurement And Adjustment Of The Brake Torque; Adjustment Of Pressing Force Of Pressure Roller Unit - Panasonic AG-7350 Series Service Manual

4-3-4. MEASUREMENT AND
ADJUSTMENT OF THE BRAKE
TORQUE
<<TOOL>>
Torque Gauge ; VFK0133
Adapter for Gauge ; VFK0134
1. Remove the top cover and the cassette compartment.
2. Attach the adapter to the torque gauge and place the
deck in STOP mode (Subloading mode).
3. Place the torque gauge on the reel table as shown in
Figure M38. The weight of the gauge should not rest on
the reel table.
4. Turn the torque gauge in the direction indicated in Fig-
ure M39 until the brake begins slipping and read the
gauge.
Figure M38 Measuring Method
B~A A~B
Supply Reel Takeup Reel
A B
Takeup
more than 50 g-om
more than 550g-cm
Supply more than 40 g-em
Figure M39 Specification of Brake Torque
5. If it is out of specification, replace the Brake Spring.
<<NOTE>>
If the proper brake torque cannot be obtained by replacing the
Brake Spring, clean the braking surface of the reel table with a
soft cloth and re-measure the brake torque. If its still out of
specification, replace the Main Brake (S) or (f) Unit.
4-3-5. ADJUSTMENT OF PRESSING
FORCE OF PRESSURE
ROLLER UNIT
<<TOOL>>
Fan Taype Tension Gauge ; VFK66
Fine Adj. Screwdriver ; VFK0330
VHS 180 min. Cassette Tape
<<SPEC>>
930g
+/-
70g
1 . Remove the Cassette Compartment.
2. Play back the end portion of VHS (180 min.) tape.
3. Insert a Fine Adj. Screwdriver in the hole (C).
4. Slightly losen the screw (B).
5. Set the Fan Type Tension Gauge to the part (A) of Pinch
Roller Unit.
6. Press the Arm with the Gauge, In the direction Indicated
by the arrow as show in Figure M40.
7. Adjust the Solenoid Base so that the reading of the
Tension Gauge is 930g
+/-
70g at the moment of the
tape running stop.
Screw (B)
Capstan Shaft
Pressure Roller Unit
Figure M40
4-13
....
z
w
:E
....
en
:::)
..,
c
~
_.
~
(.)
z
~
:I:
(.)
w
:E