Head Carriage Adjustment - IBM 6360 Product Support Manual

Head Carriage Adjustment
CAUTION
When a diskette drive is removed from
its mounting, verify the ground
th rough the AC connector. Check
for 0 ohms between the diskette unit
base and the diskette drive.
1. Power on with the Memory Record
Button pressed to place the system
in resident non-automatic diagnos-
tics. Select the diskette drive to
be adjusted (Test D).
2. Load a diskette.
3. Execute Test L to place the
stepper mqtor at Phase
o.
(Disre-
gard the results of the test.)
4. Remove the read/write cable head
guide.
WARN I NG : Do not allow the head
cable to touch the drive belt.
5. Loosen the stepper motor pulley
clamp screw
0
and rotate the
pulley to align the timing pin
holes in the pulley and casting
G.
6. Insert the ~timing pin into the
timing pin holes and tighten the
pulley" keeping the band parallel
to the pulley 2.03mm
±
0.25mm
(0.08
±
0.01 inches) from the
casting
e.
7. Remove the diskette and the timing
pin. Select and execute test N.
This places the head carriage
detent at track 40.
8. Verify timing pin hole alignment
between the pulley and casting.
Step the head carriage from track
40 to track -39 and back to track
40 by pressing the spacebar twice.
The stepping action is necessary
because of the torque character-
istics of the stepper motor. It
provides a positive detent for
this adjustment.
9. Loosen the carriage bracket screws
O.
Attach a O. 508mm (0.02 inch)
feeler gauge to the track 40
adjusting surface using the clip
e.
10. Install
the
spring to
against the
Tighten
the
screws
0
carriage pressure
hold the carriage
feeler gauge
O.
carriage
I I
I I
I I
I I
bracket
• Timing Pin Holes
---=-----=~
2.03 mm
±
0.25 mm
~==!:::=::!:~~~(0.08
±
0.01
inches)
•
Clamp ----~wn
• Clamp Screw
-t
Timing Pin
7-30 IBM Displaywriter Product Support Manual