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SPINDLE
1-
z
0
a:
...
OUTER
BARS
ON TIMING DISK
TIMING RING
USED FOR 60Hz
INNER BARS
ON TIMING DISK
TIMING
RING
USED FOR 50 Hz
Figure 2-1
HEAD
MODULE
Bottom View of The TM-100 Disk Drive
0
SPEED CONTROL
Figure 2-2
Location of R4 Speed Control Pot
J1
SERVO
JUMPER
DRIVE
MOTOR
2.1.1.7
If the drive motor's speed cannot be adjusted, see Section IV (Troubleshooting Guide).
2.1.2
Instantaneous Speed Variation Check
The Instantaneous Speed Variation (ISV) checks the smoothness of the spindle's rotation. This is determined by
the disk drive system, which consists of the drive motor, drive belt, pulleys, hub, and hub
bearings.
2.1.2.1
With the work diskette inserted, write a 2F (all ones) pattern on any track.
2.1 .2.2
Connect a wideband oscilloscope to Test Point 5 on the logic PCBA, using Test Point 6 as a ground.
2.1.2.3
Set up a dual-channel, wideband oscilloscope, as follows:
Vertical:
2 Volts Per Division
Time Base:
1 usec Per Division
Internal Trigger:
Positive Edge
2-2
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