IBM 5280 Maintenance Information Manual page 138

Distributed data system, maintenance diskette drive
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Page of SY31-0602-0
As updated 5 June 1981
By TN L SN20-9529
Head Load Solenoid and Bail
343
SOLENOID AND BAIL SERVICE CHECK
r
1.
Go to 344, step
1.
2.
3.
I
4.
DANGER
Capacitor discharge voltage might be present at the
socket when the AC drive motor power cable is
disconnected.
Disconnect the AC drive motor power cable
D.
I nsert a diskette into the diskette drive and close
the diskette locking lever
D.
Install a jumper from
D
(ground) to
II
(-head
load).
18
Head Load Solenoid and Bail
I
5.
Install a jumper from
fJ
(ground) to
II
(-disable
stepper' motor).
343
6.
Power on.
7.
Visually check for a 0.3 to 0.7 millimeter (0.012 to
0.028 inch) gap
II
between the bail Dand the head
load arm
III
for all of the carriage travel (track 00
through track 76).
8.
If the gap is within the limits, proceed with step 9.
If the gap is not within the limits, go to 346, step 2.
9.
Remove the jumpers installed in steps 4 and 5.
10.
Open the diskette locking lever and remove the
diskette.
11.
Power off.
12.
Reconnect the AC drive motor power cableD.
13.
End of service check.

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