11
incorrectly (or not at all), the sensors are ‘in the dark’ (make
sure a train is not parked over the sensors), a sensor fell out of
the hole or a wire is broken. If your layout is powered up by
one switch that powers the lights as well as the TrainSpeed 4
power source, you may get missing sensor errors. The unit in
this case should operate normally even though the missing
sensor error occurred. If you want to verify the sensors in this
case you will need to power down and power up the
TrainSpeed board to initialize it correctly.
One common occurrence with the connector used is that only
one row of pins is covered by the connector
If you are sure that the wiring is correct then you should use
the test mode to see if one or both of the sensors are operating
correctly. Do this by powering down the unit and removing
all jumpers. Install one jumper on the pair of pins marked ‘T’.
Apply the other jumpers as shown in this table
Option Jumper
1
2
OP.x
Sensor 1 displayed
Out
Out
0
Sensor 2 displayed
In
Out
1
Sensor 3 displayed
Out
In
2
Sensor 4 displayed
In
In
3
Wrong!
Correct