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9
Testing the Communication Cable
The communication cable on the 7426 Model 1
contains a round test plug.
The communication cable on the 7426 Model 2
contains a flat test plug.
D
Be sure that the test plug is securely
connected. (On the Model 2, tighten the
retainer screws.)
D
Press the lnit/Test switch to Test (right).
1
ls the Unit Ready lamp blinking, the Test Mode
lamp on, and the Machine Check lamp out?
YES
NO
1
D
Press the Power Switch to 0 FF ( 0).
D
Move the test plug from port 3 to
port 0.
D
Restart Procedure 4, Powering On.
lf the problem persists, notify your
supervisor and return the 7426 to IBM
(see Chapter 5).
D
Press the lnit/Test switch to Test (right).
The Unit Ready lamp will now be on and
blinking. lgnore the status of the other
lamps.
0
Go to Procedure 10.
1-10
Model 1
Screws
Model 2
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