Fujitsu M255XK Customer Engineering Manual page 52

4.4.11 Track 00 Sensor Inspection and Adjustment
Tools Required: Phillips Screwdriver, M3
Work/Scratch Diskette
Alignment Disk
Exerciser (AVA 409 or equivalent)
Oscilloscope
Screw Lock Liquid
Intraconnector 34-pin
Proceed as follows:
1. Connect the oscilloscope to TP7 (Track 00 Sensor). Set the oscilloscope to
DC mode, 1.0 volt per division.
2. Start the Spindle Motor and load the work/scratch diskette.
3. Ensure the voltage at TP7 is 0.5 Volts or less with the Read/Write heads
located at Track 00.
4. Seek the Read/Write heads to track 02.
5. Ensure the voltage at TP7 is 3.0 Volts or more with the Read/Write heads
located away from Track 00 (track 02).
6. If the voltages, measured in steps 3 and 5, are not within the specified range,
adjust the Track 00 sensor position as follows.
7. Connect the oscilloscope's vertical input to TPI or TP2 (pre-amp).
Connect the Trigger to pin-B of the Intraconnector (Index).
Set the oscilloscope to AC mode, 0.2 Volts per division, and invert channel B.
Set Time Base to 20 milliseconds per division.
B. Insert the alignment diskette.
9. Seek the Read/Write heads to the alignment track, where the lobe pattern
shown in Figure 4-11 is observed (Track Alignment must be correct before
proceeding, refer to paragraph 4.4.10).
10. Connect the oscilloscope to TP7 (Track 00 Sensor) and set the oscilloscope to
DC mode, 1.0 volt per division.
11. Seek the Read/Write heads to track 02.
TS-021-0130B7 ••• 01 4-20