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Chapter 3
Preventive Maintenance
and Troubleshooting
This chapter outlines maintenance and troubleshooting procedures for the D2246 disk
drive. It describes preventive maintenance, test operations and test points, and asso-
ciated waveforms. Refer to Appendix C for information on how to use the optional
diagnostic panel.
3.1 GENERAL MAINTENANCE RULES
Always observe the following general rules when replacing parts or servicing the disk
drive.
• Turn off the disk drive and disconnect all ac power to the drive power supply
before performing any maintenance procedure on the drive.
• Never remove or install any PCB, or disconnect any connector, plug, or wire
while power is on.
• When removing any connector, grasp it firmly by its sides and pull it out. Do not
remove any connector by pulling on the wire bundle.
• Do not remove any parts that are not specified in the replacement procedures.
• Package PCBs in an electrostatic-free envelope when they are transported.
3.2 MAINTENANCE TOOLS
Standard maintenance procedures require the following common hand tools.
• No.1 Phillips screwdriver
• No.2 Phillips screwdriver
• Small straight-tip screwdriver
The following instruments are also required.
• High impedance voltmeter
• Oscilloscope (Tektronics 465 or equivalent)
A rotor handler (NEC part number 134-233280) and a diagnostic panel (NEC part
number 134-200267) are recommended.
3-1
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