IBM System/34 Maintenance Manual page 363

27-630 DRIVE BAND ADJUSTMENT 27-635 DRIVE BAND REMOVAL
AND REPLACEMENT r""
1. Remove power and the 72MD unit (see paragraph
r
\',,",,--_
.
.;'
27-200).
Removing the Drive Band
2. Remove the picker/cam casting assembly (see
paragraph 27-400). 1. Remove the picker/cam casting assembly (see
paragraph 27-200).
/ , , - ,
3. Remove the two screws. and the wiper
\ , - _ /
assembly
O.
2. Remove the two screws. and the wiper
assembly
O.
4.
Move the head / carriage assembly
e
toward the
hub to its front limit (cylinder 76). 3. Move the head/carriage assembly
e
toward the
hub to its front limit (cylinder 76).
/-""
5. Remove the two band clamp screws. and the
,
clamp. 4. Loosen the two idler mounting screws
0,
push
\...'" -'
the idler assembly
0
against the spring tension,
6. Loosen the two idler mounting screws
0
and let and then tighten the mounting screws
O.
the spring tension place the idler
O.
Tighten the
mounting screws. 5. . Remove the two band clamp screws. and the
clamp and place the head/carriage assembly at
7. Turn the stepper motor pulley by hand a few times the back limit (cylinder 00).
to center the drive band
G
on the idler pulley
e.
6. Remove the clamp screw
0
and the clamp
e.
8. Place the head/carriage assembly
e
at cylinder
40. Check to see that the band mounting slots. 7. Carefully remove the drive band ends
0
from the
are centered (left to right) over the mounting holes pulley pin. and remove the band.
on the carriage pad.
(-----,
"'-j
9. Repeat steps 7 and 8 with the head/carriage Reinstalling the Drive Band
assembly at cylinder 76 and then cylinder 00.
1. Place the drive band
G
around the idler assembly
10. Are the mounting slots centered?
e·
Y N
-
Loosen the band clamp screw
O.
2. Carefully install the drive band ends
0
on the
-
Place the head/carriage at approximately
pulley pin. as shown.
cylinder 40.
- Turn the stepper motor pulley to center the 3. Reinstall the band clamp
e
(with the notch facing
mounting slots. and then tighten the away from the stepper motor) and the clamp
clamp screw
O.
screw
O.
(Ensure that the drive band is straight.)
-
Repeat step 9.
4. Go to paragraph 27-630, step 6.
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(
11. Move the head/carriage assembly
e
toward the
\----
'
hub to its front limit (cylinder 76).
12. Reinstall the clamp and the two clamp screws • .
(Do not tighten.)
( '
13. Go to paragraph 27 -605, step 4.
' ..........
"
78
27-630