I have a Challenger in for repair that I can't get to chuff. Has a TAS SAW board. All functions work except chuff sound.Replaced Railsound, power, radio, and sensor boards with no luck. Is there a railsound/signal sound connection that may be bad, as there is no separate switch. It acts like it is in signal sound mode. And have tried TMCC reset code also.
Thank you, Chuck
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I would think possible mother board trace damage. Chuff signal not getting to the RS or R2lC. It does have speed control correct? Just no chuff? G
Right G. All traces look fine. Is it possible to put a TAS board in signal sound mode?
SAW boards don't have speed sensors, no? The steam engines I have with SAW boards all have a chuff switch. If it has a tach tape and optical sensor then its an EOB.
Pete
This set up uses the magnet on the tender axle with the sensor board right above it. It is acting exactly like it is in Signal sound mode, but there is no railsound/signal sound selection switch. 1 loud chuff when power is first applied,then nothing. All other functions work fine. Whistle and bell, and crew talk are all there. Just for the fun of it, I tried a diesel sound board and the engine motor sound would not rev up when I spun the axle.
My 3rd Rail engines use a Hall Effect pickup over the magnet. Is this the sensor board you said you replaced? If so then it does point to a problem on the motherboard. Hall effect devices require power, likely 5v. Could be checked out with a voltmeter if you apply power to the tender.
Pete
Chuck, did you try a different steam RS board? Falcon
Falcon70 posted:Chuck, did you try a different steam RS board? Falcon
Looks like he did from his first post. G
After hours of frustration yesterday, I finally located the problem. On the TAS motherboard I found a tiny hairline crack on a almost invisible trace on the backside of the board. Gunrunner John helped with the post he had on the pin outs for the audio board that he posted here. Not being really familiar with TAS SAW boards, it took a long time to fine the problem that the Audio board was not receiving the chuff signal from the hall effect sensor board. I was just about ready to scrap the whole system and replace it with a ERR system. It is in a brass 3rd Rail Challenger.
Thank you everyone who contributed.
Glad you got it fixed good luck!
Great forum isn't it everybody here try's to help you!
Alan
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