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6.
Confirm the position by observing the Cats Eye pattern.
7.
Set up the oscilloscope to monitor the TTL signal at IC U8,
Pin 4.
8.
Step the carriage back to Track 1.
9.
Ensure the signal at Track 1 is at least 2.5 volts.
10.
Step the carriage out to the radial alignment track.
11.
Step the carriage back to Track 2.
12.
Verify the logic level at IC U8, Pin
4,
is less than
0.8 vol
t.
13.
If all of these checks are satisfactory, no adjustment
is required.
14.
If any of these checks is unsatisfactory, adjust the
Track
a
Sensor.
Track
a
Sensor Adjustment
1.
Loosen the retaining screws on the base of the
Track 0 sensor.
2.
Retighten the
scr~w
on the spindle side of the sensor to
provide some friction on it.
The screw at the rear of the
sensor is for the Track
a
stop (see Figure 5-13).
3.
Move the sensor to the rear of drive as far as it will go.
4.
Step the carriage back from the radial alignment track to
Track I, but do not restore it to Track O.
5.
Slide the Track 0 sensor toward the spindle very slowly
until the signal at IC U8,
Pin 4, is at least 2.5 volts at
Track 1 and less than 0.8 volt at Track 2.
Chassis camming
bars are located at the front and the rear of the sensor.
6.
Retighten .the screw on the spindle side of the sensor.
7.
Repeat the Track 0 sensor check to ensure the correct
setting has been attained.
5.10
TRACK 0 STOP ADJUSTMENT
The
Track
has
been
Track O.
o
stop screw should be adjusted after the Cats Eye pattern
adjusted,
or when the carriage seeks to a track lower than
5-16
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