| Problem |
Possible Cause |
Solution |
| Signal fails to change to red |
- Dirty rail - especially steel rail
- Broken wire or loose wire
|
- Clean rail with wire brush
- Check wiring - test board with link wire
between L and SW terminals. If board works, trace wires and test rail
connections.
|
| Signal fails to return to green after
train leaves section |
- Current leakage between the rails
- Metal swarf in section break
|
Check that the load bank bulb is
working.
Switch off the circuit then switch on -
- Goes to green then you are looking for low loss
- swarf in section breaks, excessive water on sleepers etc.
- Reverts to red then you are looking at a
section short or wire fault - see below.
|
| Signal sticks on red |
- Wire fault (short)
- Rail/section short
|
As above + check if using override
wire, this is not powered. |
| Bulbs are dim |
- Voltage drop
- Loose connections
|
- A bulb at the end of a 30m wire is noticeably
dimmer due to the resistance of wire. If possible feed power to signals
in a central position.
- Check all connections are tight and dry. Wet
connections can cause loss of power.
|
| One bulb not lit |
|
|
| Both bulbs not working |
- Bulb failure
- Power failure
|
- Replace bubls - both could have failed
especially if the signal has been dropped
- Check power supply to the board/socket
|
