COBHAM SEA TEL 9711IMA-70, Installation Manual

Page: 105 / 178

9711IMA-70 Maintenance
15-17
15.4.10. Circular Limit Switch Replacement Procedure:
The feed assembly does not need to be re-calibrated as long as the potentiometer has not been replaced,
disengaged or removed from its mounting location.
After you have ascertained that the circular section potentiometer is failed:
1. Note orientation of the failed limit
switch.
2. From the underside of the bracket, using
your 2mm Allen wrench, remove the
mounting screws and remove the failed
limit switch.
3. Install the replacement switch on the
bracket using the screws removed in the
previous step. This should orient the
body of the switch such that the wire
connections will be outward from the
body of the feed assembly.
4. If the wires will be soldered to the
replacement switch, unsolder the wires
from the failed switch. Install a short
piece of heat shrink tubing on each wire
and then solder each wire to the correct
terminal on the switch (refer to drawing
134868 page 2 wiring diagram).
5. If the wires and heat shrink are already
provided on the replacement switch,
disconnect the wires of the failed switch
and punch the wires of the replacement
switch into the IDC connector that plugs
into the Motor Termination PCB (refer to
drawing 134868 page 2 wiring diagram).
6. Plug the IDC connector into the Motor
Termination PCB (refer to drawing
134868 page 2 wiring diagram).
15.4.11. Linear Pot Replacement Procedure:
The feed assembly MUST be re-calibrated if the potentiometer has been replaced, disengaged or
removed from its mounting location.
After you have ascertained that the circular section potentiometer is failed:
1. Using your ½” open end wrench, loosen
the locking nut of the failed
potentiometer and move it away from
the body of the feed assembly on its slot
and lift it up out of the bracket through
the large hole at the end of the slot.
2. Note orientation of the drive sprocket on
the potentiometer shaft. Loosen the
Allen set screw from, apply heat to soften
Loctite between sprocket & shaft and
remove the sprocket from the
potentiometer shaft. Save the sprocket
for re-installation.
3. Unplug the potentiometers IDC
connector from the Motor Termination
PCB.
EAR Controlled - ECCN EAR99