IBM 5280 Maintenance Information Manual page 109

Page of SY31-0602-0
As updated December 5, 1980
By
TN L SN20-9590
Head Load Solenoid and Bail
343
SOLENOID AND BAIL SERVICE CHECK
1. Power off.
2.
3.
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
II.
I nsert a diskette into the diskette drive and close
the diskette locking lever
I).
Power on.
5. Install a jumper from
fJ
(ground) to
II
(-head
load).
18 Head Load Solenoid and Bail
343
6.
7.
8.
Install a jumper from
II
(ground) to II(-disable
stepper motor).
Visually check for a 0.3 to 0.7 millimeter (0.012 to
0.028 inch) gap
II
between the bail
II
and the head
load arm
II
for all of the carriage travel (track 00
through track 76).
If the gap is within the limits, proceed with step 9.
If the gap is not within the limits, go to 346, step 7.
9. Remove the jumpers installed in steps 5 and 6.
10. Open the diskette locking lever and remove the
diskette.
11. Power off.
12. Reconnect the AC drive motor power cableD.