Solenoid And Bail Adjustment - IBM 6580 Product Support Manual

Solenoid and Bail Adjustment
CAUTION
When a diskette drive is removed from its mounting, the
ground through the AC connector must be verified. Verify
the ground by checking for 0 ohms between the Diskette
Unit base and the diskette drive.
1. Turn the system power off.
2. Disconnect the diskette AC power cable from elec·
tronics module panel 2.
3. Close the diskette handle.
4. While looking into the diskette guide opening, loosen
the bail lever screw . •
For the type 1 drive, move the bail lever until the load
arm pad just touches the head.
For the type 20 drive, insert a piece of paper between
the heads and move the bail lever until the two heads
just touch the paper.
5. Observe the marks on the bail lever relative to the bail
alignment edge . •
6. For the type 1 drive, turn the bail lever one and one
half spaces (marks) clockwise and tighten the bail lever
screw.
For the type 20 drive, turn the bail lever one space
(mark) clockwise.
7. For the type 1 drive, the gap should now be 3 to 4 mm
(0.118 to 0.159 inches) between the head and head
load arm. Check visually only . •
For the type 20 drive, the gap between the head sur·
faces should be 2 to 3 mm (0.079 to 0.118 inches)
check visually only . •
8. Load the diskette and turn the system power on.
NOTE: DC voltage will be present at this time to activate
the head load solenoid.
(Adjustment procedure continued on next page.)
Eyelet Crimp
Facing Out
•
DISKETTE UNIT - Adjustments
-33-
--
3.0 to 4.0 mm
\X;rt81t:~~~~9
inchl.-J
2.0
to
3.0
mm
(Type 20 drivel
(0.079 to 0.118
inch I
Bail
a!!l.
Cable
Head Load Solenoid De-activated