IBM 5100 Maintenance Information Manual page 172

5100 SYMPTOM INDEX
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Symptom Isolation Aid Fix
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Intermittent process checks with all Remove all the I/O devices to see if Replace the printer adapter card.
I/O devices attached. the problem still occurs.
Intermittent process checks and bring Check the power cable plug (YU1) on Reform the clamp holding Y1.
up failures. the A 1 board. The clamp might be
(
formed wrong; this allows the plug to
'",--/
fall out.
Process check on power up. Suspect the K2 storage card. Swap Replace the K2 card.
j
the K2 card with another storage card
to verify this.
,
Bring up failure on power up. Go to DISPLAY REGISTERS. If ROLO Replace the G2 card.
is 0006, the failure is in the bring up
1
diagnostic.
Fails to power up intermittently. Fans None. Replace the POWER ON/POWER
run but there is no voltage to A 1
OFF switch.
board.
Fails to power up within five seconds Remove the AC fan motor plug and If the machine powers up, suspect
after power down (30 to 90 seconds). the AC tape motor plug at the AC the wiring of the AC box.
box. Then power up.
Blows card and land patterns on A 1 Check the TV monitor line cord wiring The customer must have the TV
board after installing a TV monitor. for an error causing chassis to be hot monitor wiring corrected.
(110 AC).
Keyboard locks with flashing cursor. Check the last key pressed and verify
Clean or replace the failing flyplate
,--/,
that it operates. Press the RESTART and / or key module.
key to isolate the failing key.
Key is pressed and wrong character is None. Replace the ROS card, storage card,
displayed. or display card.
Unsteady display. Switch to DISPLAY REGISTERS. Repair the connections on the
Check the connections on the brightness control.
brightness control.
No display and registers are not Remove the printer from the system. Replace the printer adapter card.
running.
Unable to clear messages from
None (operator error). Do not use undefined function keys or
/
display line 15 when errors occur copy display without a printer
/
during an input statement. attached to the system.
Display character distortion. Adjusting the CRT has little or no Replace the J2 card.
effect.
TV monitor has wavy or distorted 5100 display is OK. Uncrimp the cable connection to the
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characters.
TV monitor.
166 APL halts in BASIC. The problem shows up in new Do not use new unmarked tapes as
unmarked tapes copied by the tape output for the tape copy program.
copy program.
Mark the new tapes with at least one
file before using.
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