Apple Workgroup 9150 Specifications download pdf (Page 52)

Troubleshooting Symptom Charts/Miscellaneous

(Continued)

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Miscellaneous

(Continued)

About This Macintosh

reports less memory

than is installed

1 Verify that RAM SIMMs are installed in matching pairs

(same size and speed).

2 Replace RAM SIMMs.

System hangs, I/O

errors, or “mirrors

out of sync” errors

resulting from SCSI

Bus-intensive

activity

1 Verify that system software is version 7.1.2 or later

(9150) or 7.5 or later (9150/120).

2 Clear parameter RAM. Hold down <Command> <Option> <P>

<R> during startup but before “Welcome to Macintosh”

appears.

3 Replace the logic board with part number 661-0993 and

retain customer’s SIMMs. (Note: This problem occurs only

on the 80 MHz version of the WS 9150 and only during

periods of heavy SCSI Bus activity (for example, when using

backup programs or disk arrays).

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Apple Workgroup 9150 Specifications Page 52