IBM 3278 Series Maintenance Information page 50

J
N P
566
MAP 02
Display MAP
PAGE 8 OF 19
042
Remove and verify the connections at the
CRT socket.
Measure resistance on pins 1 and 14 at CRT
base.
If more than 5 ohms exchange CRT.
If less than 5 ohms verify cable and
connections from Low Voltage power supply
to CRT socket. (See Figure 4-14.
Test for an open wire from J2-3 to CRT
socket pin 1 and for an open between J2-9
to CRT socket pin 14. (Figure 4-12)
Repair or exchange cable if open.
If cable tests good exchange the CRT.
Reconnect coax signal cable, feature card(s).
Verify correct operation.
043
Exchange the High Voltage power supply.
Reconnect coax signal cable, feature card(s).
Verify correct operation.
044
Does raster appear normal? (Covers full display
areal
N
045
Is there a single line at or near the top of the
screen?
999
STU
2·02-8
SY27-251 0·6