I had to replace the one of the headlights in the Railmotors and this is what I measured with the good one and they are:
· 5.0 Volt Incandescent lamps.
· Cold Resistance 7.3 Ohms.
· Current Draw 70 mAs.
The output from the QSI was measured at 4.8 volts and did not change when I cut the lead of the good lamp. This suggests that the decoder has a 5 volt voltage regulator on board to supply the constant voltage for the lamps and does not use a resistor.
Try finding 3.0 mm 5.0 Volt lamps – good luck.
I told the customer before I saw the Railmotors, if the lamp was blown, I would fit LEDs. After talking to Eureka Models, the only easy fix was to fit LEDs. They look good.
In the photo the lower solder pad (white dot) is the positive voltage for the LED Anode
I installed 3.0 mm Golden White LEDs from Gwydir Valley Models that come
with a 270 and 470 ohm resistors.
Bend the LEDs and resistor leads as shown in the photo.
LED current for 470 ohm - 4.7 mAs and 270 ohm – 7.8 mAs. You cannot tell the difference when using high intensity LEDs.
Checked with DCC and had to carry out a reset on the QSI. This happens sometimes when soldering. To reset QSIs program the motor unit on the Program Track by
- Set CV 49 to 128.
- Set CV 50 to 255.
- Set CV 56 to 113.
Program CV 33 to 1 and CV 34 to 2, to extinguish the front Headlight when going in reverse.
I had a little problem when programming that was fixed by cycling the power. I find I have to do this regularly when resetting decoders, especially my Tsunamis.
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My meter must be playing up, but I suspect that due to the PWM drive for the lights I am getting strange readings.
Connected the lamp across a 1.5 volt battery and it is DIM.