IBM 3270 Maintenance Manual page 329

3-1800-14
Disconnect the expansion board power
connectors and take resistance measurements on
the expansion board pins listed in the table.
Ohms
Adjust
Control
-laid
+ Leld
Minimum
Resistlnce
5
3
50
ohms
6 7
4
9
50 50
ohms ohms
8 8 8
10
11
12
50 50
50
ohms ohms
ohms
Connectors
Top View Power Supply
ARE ANY OF THE RESISTANCE
MEASUREMENTS BELOW THE MINIMUM
SHOWN IN THE TABLE?
NO Replace the expansion unit power supply
(see Section 5, "Removal/Replacement and
Adjustments").
YES Replace the expansion board (see Section
5, "Removal/Replacement and
Adjustments").
Maintenance Information