Pinch Roller Spring
Figure 4-l
n
PINCH ROLLER PRESSURE ADJUSTMENT
(See Figure 4-l and 4-2)
Place the unit in play mode,
2. Use a tension gauge (0
500
to push it to a part
of the pinch roller until the pinch roller comes away
the capstan. Next gradually weaken the force in the
reverse direction until the pinch roller hits the capstan
(that is, it begins rotating), then see that tension gauge
is reading 295 to 365 grams.
3. Make sure there are clearances
,
between
the pinch roller lever and sub. chassis.
4. the above value is not satisfied, adjust the pinch roller
pressure spring by bending it, or replace.
n
TORQUE CHECK AT PLAY, FAST FORWARD AND
REWIND MODES
1. Put a torque measuring cassette into the set.
2. The torque values, in each mode must be as tabulated
below.
n
TAPE SPEED ADJUSTMENT
1. Using a test tape (TEAC,
8
record-
ed), play it back at the midpoint but not at the running
start or end point.
2. Connect a frequency counter to the line output socket.
3. Use a bladed screwdriver to adjust, through the adjusting
hole at the bottom of motor, the semivariable resistor
so that the frequency counter reads 2975 to 2995 Hz.
TEST
TAPE
MTT-1
PLAYBACK Mode
Frequency Counter
13c
0
0
0
RECORD/
PLAYBACK
HEAD
Line output socket (SO3 or
Figure 4-3
