I have a couple of MTH Z4000 transformers with fluctuating output voltages. One Z4000 fluctuates by +/- .5v( 1 volt swing) and another fluctuates by +/- 1.5V (3 volt swing). The 3V fluctuation is very noticeable when running passenger cars with incandescent lighting. I also have a 3rd Z4000 where there is no fluctuation with the output voltage. All readings were taken at 18 volts output and with a constant 118.4 volt input.
Any suggestions on what is causing the Z4000 outputs to fluctuate and the best way to fix it. Also, does anyone have a schematic for the Z4000 transformer. Can't find anything on line or from MTH.
Thanks
Bob D
