Reply to "Big Boy smoke problem"

Carl TuvesonOGR Forum Member DIGITAL SUBSCRIBER

The big Boy uses an "analog" smoke unit.

It gets it's voltage from the AC smoke regulator. (A 1" square board in a heat shrink package) The Smoke regulator board has several output voltage levels controled buy the serial data. It's output is chopped AC and when read by a voltmeter will read from 2.5 to 4 volts AC. The smoke fan motor gets its voltage from the circuit on the smoke unit board. It has the pulses from the chuff switch shaped by a 556 chip on the smoke unit board. The power for the smoke motor circuit is regulated from the output voltage of the AC Smoke regulator board.

So if the fan is running then the board is getting voltage from the AC regulator.

Re-read the voltage at the element using the high setting with the loco running it should be 3.7-4 volts. If it is then the 6-8 ohm elelmnt is bad or clogged.

Carl

1/17/127:37 AM

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