IBM 3278 Series Maintenance Information page 36

R S T
777
035
MAP 01
Terminal Failure MAP
PAGE 8 OF 13
Switch unit off.
Reinsert logic cards one at a time to isolate
failing card.
036
Switch unit off.
Exchange low voltage power supply.
Reinsert logic cards, keyboard cable and analog
card.
Switch power on.
Test for proper operation.
037
Switch power off.
Remove mask assembly (see 6.5).
Disconnect 01C/A1Pl from 01C/A1Jl (See Fig.
4-5).
Switch unit on.
Verify -44 volts at 01 D / PS l-J3-1.
Is voltage still incorrect?
N
038
Exchange Intensity/Contrast Control (see 6.5.3).
Reinsert analog card, 01 C / A 1 Pl and mask
assembly.
Switch power on.
Test for proper operation.
039
Verify seating of connectors on low voltage power
supply. If all connectors are seated but problem is
still present exchange Low Voltage power supply.
Switch Unit On and test for proper operation.
2·01·8
SY27-2510-6