Tandon TM100-1 Operating And Service Manual page 55

5.10 TRACK 0 STO P
ADJUSTMENT
The Track 0 stop screw should be adjusted after
the Cats Eye pattern has been adjusted, or when
the carriage seeks to a track lower than Track 0 .
1 . Set up the oscilloscope:
Channel A: Test Point 1
Channel B: Test Point 2
Ground: Test Point 10
Read Differentially: A plus B, B inverted
Time Base: 20 milliseconds per division
External Trigger: Test Point 7
2 . Apply power to the drive.
3 . Select the drive.
4 . Insert an alignment diskette.
5 . Turn the Track 0 stop screw counter­
clockwise two turns with a 0.050-inch
Allen wrench or a number one Phillips
screwdriver (Figure 5-13).
6. Step the carriage to Track 0 , and observe
the waveform.
7 . Slowly turn the screw clockwise until
the output amplitude begins to decrease
on the oscilloscope.
8 . Turn it counterclockwise until the ampli­
tude stops increasing.
9 . Turn it counterclockwise an additional
1/8 turn.
5.11 HEAD OUTPUT CHECK
The head output check measures the head' s
output amplitude relative to the diskette being
used. When using certified, quality media, typi­
cal values will be 200 millivolts peak-to-peak or
greater. However, values may be significantly
less, 100 millivolts peak-to-peak typical, if infe­
rior or defective media is used, and does not indi­
cate a faulty head.
FIGURE 5-13
TRACK 0 STOP
5-13