Teac A-3340S - Page 16

9.MEASUREMENT AND ADJUSTMENT
-MECHANICAL-
PINCH ROLLER PRESSURE
NOTE: Pinch roller pressure is supplied by the pinch roller
spring arm and it is most important that the solenoid plunger
be full bottomed before taking pressure measurement.
Load tape or block the shut-off arm in the "ON" position.
Attach a suitable spring scale to the pinch roller shaft.
Place the unit in the PLAY mode (B™), and holding the spring
scale as illustrated, slowly draw it away from the pinch roller.
Do not allow the string to rub against the pinch roller.
Note the reading on the spring scale at the instant the pinch
roller stops rotating.
The scale should indicate 2.2.2.5kg. Optimum value is 2.4kg +0.lkg.
If adjustment is necessary, loosen the 3 screws on the capstan
solenoid and position the solenoid for optimum pressure.
Adjust solenoid-limit position so that the gap between capstan
shaft and pinch roller is approximately 7mm when solenoid is not
actuated. Limit is adjusted by loosening the mounting screw (A),
then sliding limit until proper gap is obtained.
CAPSTAN
ee
CAP E
ee
CAPSTAN
SOLENOID
‘*??
1A"
SOLENOID
LIMIT
MOUNTING
SCREW (A)
oe REPOSITION SOLENOID TO
‘
OBTAIN
OPTIMUM
PRESSURE
Fig.
9-1
Pressure
Measurement
and
Adjustment
Locations