DEC DECstation 316+, Service Manual

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2–20 Troubleshooting
2.7 Troubleshooting Problems Occurring
During System Operation
Sometimes problems occur during system operation. Use the
following list to help isolate a problem to a specific subsystem by
determining how or when the problem occurs.
The problem occurs during diskette drive access.
• Check the diskette drive and the jumper setting.
• Look for slightly loose cables.
• Check the main logic board jumper settings.
• If possible, run the diagnostics. The problem may be with the
main logic board decoding, resistor pack, or faulty loading on
the data bus.
See also Section 2.6.
The problem occurs during hard disk drive access.
• Check the hard disk drive, including jumper and switch
settings.
• Check for loose drive cables.
• Check the SCSI board. Make sure it is seated properly and its
jumpers are set correctly.
The problem seems to be video related.
• Check the main logic board VGA jumper setting.
The problem seems to be keyboard related.
• Keyboard lock may be partially engaged.
• Check the keyboard connection.
• Run the Diagnose diagnostics. The problem may be the
keyboard interface on the main logic board.
The problem is reproducible or intermittent.
• Expansion options may be competing for interrupt request
lines, I/O address range, or memory address range.