Sharp VC-M23SM Servicehandbuch Seite 19

"Le
2.
Checking the brake torque at the take-up side
ty
Sits
CW
Take-up reel
disk
Figure 4-22,
Remove the cassette housing control assembly.
Make a short-circuit between TP5005 and TP5006, both
located at the left on your side on the main PWB. Now turn
on the power.
Setting
. Set a torque gauge to zero on the scale. Place it on the take-
up reel disk.
. Switch from the FF mode to the STOP mode.
. Disconnect the AC power plug.
Checking
. Rotate the torque gauge (approx. one revolution per 2 sec-
onds) in the clockwise (CW) direction and counterclockwise
(CCW) direction of the take-up brake so that the reel disk and
the indicator of the torque gauge rotate at an equal rate. Check
that the values are within the range of CCW direction=
9.8~34mN-m (100~340gf-cm), CW direction = 4~8.3mN-m
(40~85gf-cm), and that the brake torque in the CCW direction
is at least twice as high as thatin the CW direction.
Adjustment of the brake torque at the supply side and the
take-up side
. If the supply or take-up brake torque is outside the range,
clean the supply or take-up ree! disk brake lever pad, then
recheck the torque.
If the supply or take-up brake torgue is still outside the range,
replace the main brake ass'y.
Note:
When the main brake is replaced, perform the height checking
and adjustment of reel disks (see page 13), and the brake torque
checking. -
REPLACEMENT OF A/C (Audio/Control) HEAD
iF
2.
1.
2
Remove the cassette housing control assembly.
Place the unit in the unloading mode, and unplug the power
cord. ss nt en
Removal
Remove the screw ABOMD®.
Unsolder the A/C head PWB soldered to the A/C head assem-
bly.
Notes:
1;
1. Solider the removed A/C head PWB onto a new A/C head
2.
'19
After replacement, be sure to perform the adjustment of the
tape drive train (see page 21). Under any circumstances,
avoid touching the head. Clean the head, if touched with your
finger, with alcohol.
. Take care that the springs do not fly off when removing the
screws ABO,
Figure 4-23.
Replacement
assembly.
Using the slide calipers, set 10.3 mm for the height of the A/
C head arm (bottom surface) to the A/C head plate (screw
area). (3 places)
{See the figure below.)
Solder
| A/C head PWB