IBM 5150 Hardware Maintenance Manual page 168

Error
Description
Diagnostic Action
Control
3. Is the Power light on?
Panel
r
YES:
Go to step 4.
NO: Measure for approximately
+
1 0 to
12 V dc at pin 9 on the Control Panel.
Use pin 8 for ground (see Section 5,
"Locations")~
12 Vdc?
YES:
Replace Control Panel (see
Section 3, "Removal/
Replacement").
NO: Go to page 1400-6, "Power
Supply Check."
4. Is Online light on?
YES: Go to step 5.
",.--,
NO: Measure for approximately
+
1 0 to
+
12 V dc at pin 1 on Control Pane1.
Use ground pin on Driver Circuit
card. (See Section 5, "Locations.")
12 Vdc?
YES: Replace both Control cards
(see Section 3, "Removal/
Replacement").
NO: Replace Control Panel (see
Section 3, "Removal/
Replacement").
.r
•
1400-27