Power Soak 37179 PS-275 Service Manual - Manual (Page 24)

18
6.1b Membrane Encoder
The membrane encoder is located next to the UPM
and is used to translate inputs and outputs between
the control panel overlay and the UPM. The ribbon
cables from the overlay and a four pin connector
routed from the UPM harness plug into the face of the
encoder. The four pin connector is “keyed” so that it
will only insert into the socket if it is oriented correctly.
The ribbon cables from the overlay can be installed
incorrectly and must be properly oriented as described.
Keeping the ribbon cables flat (no twists in the cable),
plug the large connector onto the inner row of pins,
making sure that the connector slides over all the pins.
The middle size connector slides onto the outer row of
pins and connects to the first four pins that are closest
to the outer edge of the encoder (see illustrations).
The smallest connector attaches to a two pin
connector that is part of the wiring harness. The
orientation of the two pin connection is not important.
The cables from the overlay membrane should be a
tight fit onto the pins. The connectors should not slide
on or off the pins easily. The tight fit is what keeps the
connectors plugged into the components. The tight fit
also makes it difficult to unplug the connectors.
To separate the interface unit
for mounting, squeeze the tabs
on the end of the case and pull
on the back edge of the
mounting flange.
Tabs
Back edge of the
mounting flange
Separated for mounting
Membrane Encoder
Large connector
slides over all the
pins on the inner row
Smallest connector plugs into
the wire harness
The middle size connector plugs into
the pins at the end of the outer row of
pins
Four pin
connector
Middle size connector slides
over pins on outer row.