Having an issue with a Legacy engine 6-28305 CSX #610 AC6000 Dummy. The smoke unit is not working. Any ideas?
All three components are replaced with new parts: 620-8265-200 Smoke Unit, 691-ACRG-103 AC Regulator, and R4LC. The smoke fan motor responds to the CAB2 on/off. At the first application of power, the smoke unit starts to operate and produce smoke. After about 90 seconds, the smoke disappears and one can hear an oscillation in the smoke unit matching the blinking of the cab lights. (The cab lights are blinking, NOT flashing with the morse signal indicating a smoke issue).
When measuring the A/C voltage across the smoke unit 3-pin plug in the first minute, there are reading of 9 to 12 volts A/C, then after about 90 seconds the readings fluctuate between 1.8- and 4-volts A/C instead of a constant reading between 9 and 12 VAC. The 1.8- to 4-volts A/C fluctuation is the same for low, medium, and high smoke settings on the CAB 2. I have let this "run" for five minutes and there was no change to the 1.8- to 4-volt fluctuations.
Each smoke unit shows 6.0 to 6.2 ohms across the smoke resistor.
All of the wires were tested for continuity and examined for shorts. The entire smoke chain was moved away from the shell body and set up to avoid shorts.
The smoke chain was rebuilt using new smoke unit, AC regulator, and R4LC three times with new components achieving the same results each time.
This unit has a TAC 2. One wire leaves the TAC 2 and joins the serial wire from the R4LC before reaching the AC regulator. For the last round of test runs, the TAC 2 wire was disconnected. The results did not change and the cab lights continued to blink (not flash).
When the shell was originally opened, the A/C Regulator smoke unit ground wire (H-) was not connected (and is not connected) and the end of the wire leaving the AC regulator was protected from creating a short. Instead, the ground wire (H-) from the smoke unit is connected to the mother board through one of the connectors. I did connect the smoke unit ground wire (H-) to ground (outside rail) and test with no changes to the results.
The other functions (motors, change of direction, couplers, lighting) all work fine.
Any ideas? The same thing is happening to the 6-28298 CSX #608 and 6-28299 CSX #609.
