IBM 7426 Manual page 31

5
Power
Test
•
Test
Mode
0
7426 Model 1
Unit
Ready
•
Line
Ready
0
The problem is external to the 7426.
Co mm
Check
•
Machine
Check
0
Have you used the Operator's Checklist (Chapter
3)
since the failure occurred?
YES NO
b
Go to the Chapter
3
checklist.
D
Verify that the loop station connector is operational. (Call the hast operator
to check the loop.)
6
7426 Model 2
Power Test Unit Line Co mm Machine
Test Mode Ready Ready Check Check
•
0
•
0
•
0
Have you used the Operator's Checklist (Chapter 3) since the failure occurred?
YES NO
1
D
Go to the Chapter
3
checklist.
D
Be sure that the modern is operational.
D
Be sure that the direct connect cable is securely connected (tighten the
retaining screws).
Does the problem still exist?
YES
1
NO
1
D
Go to the Chapter 3 checklist.
D
Go to Part 2 of this chapter and perform the External Port Test. When that
is finished, RETURN TO THIS POINT.
Does the problem still exist?
YES NO
1
D
Go to the Chapter 3 checklist.
The problem is external to the 7426. You may wish to check the modern or the
direct connect cable.
Chapter 4. Customer Problem Analysis and Resolution 4-5