No voltage at tach board | O Gauge Railroading On Line Forum

FredBOGR Forum Member DIGITAL SUBSCRIBER

@Ggg and gunrunner John , Jon Glasson

I’m working on 30-1602-1 steam engine I replaced both tender and boiler boards. Then added software using ps3 test fixture , everything worked fine, 1 smph ok . So I install the boards in the tender and boiler , start up with DCS and get a runaway.

I check the tack board gray to blue wires and get no voltage there. I check wires from tach board to plug ok perfect continuity.
Where else could there be a loss of power ? Where does the power come from ?
also looking for ps3production wiring diagram for steam engine

thanks guys

Fred Bencivenga

11/13/2111:01 PM

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GGGOGR Forum Member

5V and PCB ground come from the tender board thru drawbar to boiler board. Change the tach reader. Not uncommon for a double board failure to take out tach reader too. G

11/14/219:34 AM

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

I'm a bit surprised there is no voltage at the tach board, that seems to suggest a problem with wiring somewhere.

11/14/2110:54 AM

FredBOGR Forum Member DIGITAL SUBSCRIBER

Grj that’s what thought , I have more testing to do on the wiring.

Ggg if the tach board is blown wouldn’t there be voltage at the gray and blue wires .

I took both boards out again and put it back on the PS3 test board

still everything works fine there, but not in the engine

I have to check the draw bar thru cables later tonight

I have to figure out what’s missing battery + voltage or ground .

11/14/2111:44 AM

FredBOGR Forum Member DIGITAL SUBSCRIBER

I still haven’t found PS3 steam production wiring diagram.

11/14/2111:46 AM

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