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Appendix A
Component-Level Repair
A-l.
Introduction
The table and procedure in this appendix describe the probable and possible causes for error messages
that appear while running the pod diagnostic tests. You should first replace the components listed under
probable cause in order and then the components listed under possible cause in order.
After replacing a component, be sure to run the diagnostic test over again from the beginning to verify
that the error has been corrected.
Table A-l. Diagnostic Test Error Messages
Error Message
Probable Cause
Possible Cause
HP-75 does not turn on.
J3, U18, U19
U17, ROM connector
"firmware" is displayed, and the
unit resets.
Q3 in the power supply.
HP-75 system ERROR 16 is
displayed.
There is not enough memory
left in the HP-75 to run the pod
diagnostic.**
rom (U18) BAD
U18
J3, ROM connector
rom (U19) BAD
U19
J3, ROM connector
1LH7 BAD, *block move:MEM,
*2 bytes indirect:BAD, and *Ad-
dress lines BAD:0,1
all
are
displayed
U20
U17
0
ram 1 BAD
U20
U17
ram 2 BAD
U21
U17
ram 3 BAD
U22
U17
ram 4 BAD
U23
U17
ram 5 BAD
U24
U17
** Possible solutions:
•
Delete one or more lines from a file in the HP-75.
•
Execute CLERR '..'RRS to clear calculator variables.
• Lessen the precision or reduce the dimensions of program.
• Purge one or more files from memory.
• Execute RSSIGH # TO
specifying any unused data file pointers.
•
Purge one or more files.
• Execute RSSIGH I. 0 to t to clear the HP-IL loop.
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