646 Chair Foot Extension / Crash Limit Switch Test and Repair

1.Remove foot extension upholstery and substrate (not shown).
2.Press foot extension lever(s). Extend / retract foot extension. Linkage should retract two locking devices, disengaging the teeth from the slotted plates. This should allow foot extension to slide in and out.
3.Release foot extension lever(s). The torsion springs should pull the two locking devices into the locked position. The teeth should engage the slotted plates, locking the foot extension in position.

1.Tag and disconnect wires.
2.Place meter probes on COM and NC terminals.
Check switch tripped and untripped.
With Switch Tripped | |
---|---|
Meter Reading |
Required Action |
OL |
Limit switch OK |
Less than 5 Ω |
Replace limit switch |
With Switch Untripped | |
---|---|
Meter Reading |
Required Action |
OL |
Replace limit switch |
Less than 5 Ω |
Limit switch OK |