IBM 3278 Series Maintenance Information page 32

H
3
MAP 01
Terminal Failure MAP
PAGE 4 OF 13
018
Exchange failing fuse or fuses.
Switch Unit On. (Wait
30
sec.)
Did fuse or fuses fail again?
N
019
Verify correct operation.
If problem occurs again start over at Entry Point
A of this MAP to identify new symptom.
020
Switch unit off.
Remove 01
AI
A 1 H2 card and exchange fuse(s).
Switch Unit On.
Did fuse(s) fail again?
N
021
Switch unit off.
Exchange 01
AI
A 1 H2 card and adjust.
If fuse fails after new 01
AI
A 1 H2 card is
installed problem can be in high voltage power
supply or yoke.
Remove connector on high voltage power supply
and yoke to isolate.
022
Switch unit off.
Short is in Low voltage power cable logic cards or
keyboard. Reinstall 01
AI
A 1 H2 removed in step
20.
Remove logiC cards and keyboard cable.
Exchange failing fuse and switch unit on.
Did fuse fail again?
If
5 5
J
K
2-01-4
SY27-2510-6