IBM System/34 Maintenance Manual page 305

27-260 CARRIAGE BED ORIENT SWITCH
SERVICE CHECK
1.
2.
3.
4.
5.
Place the 72MD unit in the service position (see
paragraph 27-20kl.
Set Power to I (operator panel).
Press the Reset switch (CE panel) to orient the
carriage bed.
Visually check that I/O slot 1 aligns with the
diskette guide.
If the I/O slot 1 does not align with the diskette
guide, perform the carriage bed orient switch
adjustment (see paragraph 27-265).
Verify that the switch is good by probing its
output as you activate the switch
e
(the level
should change).
Probe the output at:
For the old style picker, TPB-16
o.
For the new style picker, TPB-17
o.
27-265
CARRIAGE BED ORIENT SWITCH
ADJUSTMENT
At power on time as well as at the end of a command
the picker/cam stepper motor and the carriage bed
stepper motor are at normal detent with windings 0 and
1 active.
Carriage bed orient is when I/O slot 1 is aligned with
the drive diskette guide and the stepper motor is at
normal detent.
To check or adjust the carriage bed orient switch, the
carriage bed must be at the orient position with the
stepper motor at normal detent.
1.
2.
Remove power and the 72MD unit (see paragraph
27-200).
Set Power to I (operator panel).
3. Remove the magazine in position 2 to view the
carriage bed orient switch.
20
4.
5.
6.
7.
8.
Disconnect the carriage stepper motor cable
G
from the driver board at J4.
Align I/O slot 1 with the diskette guide window.
Connect the carriage stepper motor cable
G
to
J4.
Loosen the switch adjusting screw
e.
Turn the orient switch assembly until the gap
between the actuator and the switch is 0.0 to 0.25
millimeter (0.01 inch).
9. Tighten the switch adjusting screw
G).
10. Reinstall the 72MD unit (see paragraph 27-200).
27-270 CARRIAGE BED ORIENT SWITCH
REMOVAL AND REPLACEMENT
Removing the Carriage Bed Orient Switch
1.
2.
3.
Remove power and the 72MD unit (see paragraph
27-200).
Remove the leads from the switch
e.
Remove the two mounting screws
G
from the the
switch bracket
0,
and remove the switch.
Reinstalling the Carriage Bed Orient Switch
1. Locate the switch
e
and fasten it to the switch
bracket
0
with the two mounting screws
G.
2. Connect the leads to the switch.
3.
4.
27-260
Adjust the carriage bed orient switch (see
paragraph 27-265).
Reinstall the 72MD unit (see paragraph 27-200).
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