Card And Board Jumpers; Read/Write Head (007) Errors; Intermittent Process Checks; Dropping Records - IBM 5100 Maintenance Information Manual

Card and Board Jumpers
Failures on the 5100 which are hard to analyze might be
associated with the jumper installed on the A 1 board,
the G2 card, or the J2 card. In several cases, the
jumpers have been missing or loose.
When working with the A 1 board or its cards, be sure
that the jumpers are installed correctly. If you are
experiencing any of the following symptoms, check the
jumpers: (See 209 for the correct jumpering of the logic
cards.)
1. Process check on power up, but restart works
properly.
2. No display; will not restart; meaningless data on
the display.
3. Single row of digits across the bottom of the
display, or blank display.
4. Unable to analyze process checks; or, more than
one type of process check at the same time.
5.
3-96
Wrong characters printed on the printer or
displayed on the display.
Read/Write Head (007) Errors
The following read/write head adjustment procedure
might decrease 007 tape errors:
1.
2.
3.
4.
5.
6.
Remove the tape control card.
Loosen the read/write head.
Position the read/write head against the front and
left of the mounting recess and tighten the
mounting screw (facing the front of the machine).
Make sure the read/write head grounding wire
clears the cartridge door when the cartridge is
inserted.
Clean the read/write head with isopropyl alcohol
part 220020C and lint free tissue.
Replace the tape control card and test the 5100
using the tape read test and MOl 860.
Intermittent Process Checks
If you are experiencing intermittent process checks on
the 5100 and cannot determine the type or the cause,
see Error Checking in the Theory section. When an error
occurs, do not reset the machine. This will allow you to
probe the failing line.
Dropping Records
If you are experiencing dropping records from files, or if
you are getting 009 or 152 errors, check the file to see
which recent changes were made and if the file is larger
than the available workspace. If you load a data file into
storage, get a 152 error, make changes or corrections to
that file, and then save the file, all data beyond the
available storage will be lost. To eliminate losing these
files, change or update the files under program control.
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