Page
26 of 40
Issue 2
13/12/99
PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
26
hand edges of the Signalbox front panel. The ‘window’ should be centrally positioned
around the label.
The Signalbox front panel does not require a separate earth wire since it makes
continuous metallic contact with the card frame.
Buttons on the Line cards for the CALL function, and on the CPU card for the
INTERROGATE function, are equipped with a screw on cap. The shaft of the push
button switch is threaded, and the round cap is also threaded. The height may be varied
by threading the cap onto the push button. This is factory adjusted and sealed. The cap
is adjusted so that is pushes the membrane slightly forward, it should be possible to ‘feel’
the cap pressing from behind central to the CALL button membrane area. The CALL
button should have a tactile feel, a ‘click’ should be felt. The cap is screwed up or down
to adjust this action. IMPORTANT - THE THREAD IS SEALED AT FACTORY. IF THE
SEAL IS BROKEN - TOO MUCH ADJUSTMENT OUT WILL CAUSE THE MEMBRANE
TO PERMANENTLY OPERATE THE BUTTON, TOO LITTLE AND IT MAY NOT BE
POSSIBLE TO OPERATE THE BUTTON.
The panel is fixed by four M4 Allen key button head screws.
5.7.2 Level Crossing Unit front panel
An earth tag is provided on
this panel, ensure that it is re-
connected when the panel is
fitted.
This panel has a foam rubber
gasket seal around its inside
edge. The panel is fixed by
four M4 Allen key button head
screws, ensure that washers
are used under the screw
heads to avoid distortion of
the label.
Figure 6 - Level crossing
Unit (front panel earth tag)
Earth tag
0.25” earth
spade connector