13
sensor completely and tightly with a dark opaque material
(usually a hand pressed down firmly will do). If you see a
change in the display from ‘L’ to ‘H” then the sensor is
working (if there is no change see the next paragraph). Now
remove the cover and roll a train car across the sensor. If you
do not see the display change or it does not stay ‘H’ while the
car is over it then there is too much light. There are several
ways to address this. You can recess the sensor further down
into the mounting hole (even below the roadbed surface) to try
to reduce the amount of light hitting the sensor. If this doesn’t
work you can use some black paint to reduce the area of the
sensor’s lens (ballast can be piled up around the sensor to do
this too). Sometimes the sensor can pick up some excess light
from floor reflections, so try covering the underside of the
mounting hole with black tape. If these measures do not fix
the problem contact TCS Inc. for technical assistance.
If the above test failed, then the sensor assembly is probably
bad. Inspect the sensor assembly for damage. Check to see if
the leads on the optics have been bent such that they are
shorting out (most likely caused while pushing the sensors up
through the roadbed). Inspect the cable itself for damage as
well. If you cannot get the sensor assembly working contact
TCS Inc. for technical assistance.
If you do not get any display on the unit when you power it
up, make sure that the intended voltage is present on the
TrainSpeed’s power terminals. If this voltage reads OK then
try disconnecting the sensor cable and powering the unit up.
If you get a display (you should see the ‘oP.x’ followed by
‘Sn.E’) then the sensor cable has been damaged. Inspect the
cable for damage and contact TCS Inc. for a replacement if
necessary.
Appendix
