@CUPRI posted:I have a dead LH O72 FasTrack switch. No light and no action. I suspect it may not be a simple repair, but a replacement circuit board is pretty expensive while a new voltage regulator, diode or transistor could be a cheap fix since there appears to be no 5 VDC. There should be 5 VDC on the terminals to the LED light stand, but there is not. Nor is there 5 VDC on the output of the voltage regulator. I am guessing there should be some higher DC voltage on the regulator input, but there is not. There are no smoked components and nothing is hot under power. Does anyone have a diagram for the circuit board showing AC and DC voltages?
No diagram directly for the main control board, however, the common failure is either the basic folded tab construction of the metal bus bar system, failure on the order of the contacts that have the ground, track , and aux power in, last it's possible to have a failure of the resistor they put in the power wire going to the board.
I would check the obvious stuff first- solder the tabs, check the order of the terminals vs the labels, ensure your power jumper is correct for using track power as the source- or even worse, definitely verify before connecting aux power it's actually going into the switch logic VS shorting to GND or instead going up the fine wire to the track.
Also, this being an O72 switch- just saying last year, I ordered 9 new ones from a vendor and all 9 had wiring errors. The 4 more I bought recently had the same errors !!
I like these switches once you fix them- but that is key- once you do the full bulletproof mod and properly wire them in, they work great.
If you just take them and install them out of the box- or worse, just connect aux power thinking the connections are labeled correctly, then failure is highly likely. 9 last year and 4 this year new in the box from vendors- the numbers are not on your side. 13 for 13 miswired from the factory.
