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Maintenance
5-7
Radial Head Alignment
To properly align the read/write heads, perform to the following steps in the order shown.
Refer to the troubleshooting section for head misalignment symptoms.
1. Connect the equipment as shown in Figure 5-3 and apply power.
2. If the DSU display reads "bAd" or if TRK 0 LED indicator on the DSU is not lit,
depress the SYSTEM RESET pushbutton on the DSU.
3. Insert Alignment disc PiN 9164-0151 into the drive and close the latch.
4. Connect and setup the scope as follows:
Connect channel A to TP7/E7 (INDEX) and ground lead to TP6/El1.
Connect channel B to TP4/E4 (READ DATA) and ground lead to TP6/El1.
Trigger:
Display:
Volts/DIV:
Time/DIV:
Internal on channel A (POS)
Channel B
.2V/DIV (using a 10: 1 probe)
20ms/DIV
5. With the scope connected, the pattern shown in Figure 5-4 should be observed.
6. Both lobes of the pattern should be equal in amplitude.
Figure 5-4:
Radial Head Alignment Waveform
7. If the amplitude of one of the lobes of the waveform is less than 80% of the other,
slightly loosen the three screws shown in Figure 5-5 and adjust the radial head align-
ment by gently turning the head alignment cam screw.
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