Free Lance Troubleshooting Guide 4·74; How To Use This Guide. 4·74; Recommendations On Failure Information 4·74 - IBM 5110 Maintenance Information Manual

Free Lance Troubleshooting Guide
This guide is a summary of the 5110 diagnostics and a
guide for troubleshooting intermittent failures.
HOW TO USE THIS GUIDE
Because this is a guide instead of a MAP, you must make
many decisions based on the information available and the
frequency of the failure. The OR circles on the Failure
Isolation Chart indicate that type of situation.
RECOMMENDATIONS ON FAILURE INFORMATION
The following recommendations are given to assist you in
obtaining failure information. Their order of presentation
has no significance.
• Determine the customer error code if possible. An
error code is normally more factual than the operator's
failure description. The descriptions of the customer
error codes are found in the BASIC Reference Manual,
SA21-930B, Appendix D, and in the APL Reference
Manual, SA21-9303,Appendix F. See Error Codes in
this section for the hardware error codes descriptions.
Use these error code descriptions to aid you in deciding
which diagnostics or MDls to run.
• If the failure appears to be a printer or a tape problem,
record the status byte information. This information will
help you to isolate the failure and to determine which
MOl to run. See Status Bytes in this section.
• Have the customer record as much information as
possible when the failure occurs.
How often does the machine fail?
Does the failure occur during one job or during
many jobs or programs?
Does the failure occur in BASIC, APL, or both?
Does the failure occur at a particular time, such
as when the machine is first powered up or after
it is warmed up?
- Is the system configuration always the same; are
other devices attached when the failure occurs?
• Record any information on the previous items and any
information on fixes in the space provided.
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