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8. MECI{ANICAL ADJUSTMENTS
8.1 PINCH ROLLER PRESSURE ADJUSTMENT
1. Put the unit into the PLAY condition'
2. Using a tension gauge (Stick weighing instru-
ment:
approximately 5009 full scale), gently
drop the pinch arm (Fig. 8-1).
3. The force necessary to separate the pinch roller
from the capstan shall be between 360 and 4409
at the take'up side, and between 90 and 130g
at the supply side. If outside these values'
reset the Pinch Pressure spring'
4. If Paragraph 3 cannot be satisfied by resetting
the pinch pressure spring, replace it with a new
one.
8.2 TAPE SPEED ADJUSTMENT
1. Connect a frequency counter to the OUTPUT
terminals.
2. Replay the SkHz part of the test tape STD-301'
Adjust the semi-fixed resistor in the motor until
the frequency at the start of the tape falls
within the range 2,995Hl2 to 3,010H2 (Fig. 8-2)'
3. When the semi-fixed resistor is turned in the
clockwise direction, the tape speed will increase'
and vice-versa.
8.3 TAPE GUIDE ADJUSTMENT
Adjustment Standard
Put the unit into the PLAY mode, and check
that the tape is running normally without curling
around the head guides (Fig. 8-3).
Method of Adiustment
If the tape curls around the head ggides' turn
the height adjuster to the left or right so a's to
obtain a suitable taPe height.
Postcdiustment Check
Put the unit into the PLAY mode, and check
that the tape does not come into contact with the
head guide.
Fig. 8-1 Pinch roller presilre adiustment
Fig. 8-2
Tape speed adjustment
Tape guide
Height adiuster
(spring balance with Sfi)g scale)
Fis. 8-3 TaPe guide adiustment
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