IBM 3278 Series Maintenance Information page 77

Z A
1 A
MAP 04
o
1
o
Feature Error MAP
PAGE 11 OF 15
051
Switch Power On.
Verify voltages at the following. For (M) version
check at 01 A/ A 1 C4, C5 positions.
01A/B4B06- minus 5 VDC.
01A/B4Bll-plus 8.5 VDC.
01A/B4D03-plus 5 VDC.
01A/B5D03-plus 5 VDC.
01A/B5Bll-plus 8.5 VDC.
If all voltages are correct (:!:1 0 %).
Use Fig 4-15 to trace voltage from logic card to
MSR connector.
052
Exchange fuse.
Switch Unit On.
Are any lights on the MSR on7
N
053
Switch unit off.
Verify fuse at 01C/Fl.
Did fuse fail again 7
N
054
Verify voltages at the following points. For
(M) version check at 01 A/ A 1 C4, C5
positions.
1 1
2 2
A A
B C
01A/B4B06- minus 5 VDC.
01A/B4Bll-plus 8.5 VDC.
01 A/ 84D03-plus 5 VDC.
01A/B5D03-plus 5 VDC.
01A/85Bll-plus 8.5 VDC.
If all voltages correct (:!:10%).
Use Fig 4-15 to trace voltage from logic card
to MSR connector.
SY27·2510-6
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