Does anyone know what would cause a TIU to produce a constant DC offset when using the variable channels? On both variable channels I get the following positive DC offsets as the voltage increases. At full throttle, the offset disappears. Horns & whistles on all equipment (PW and modern) blow constantly through the full range of voltages unless I am at full throttle. If I press the whistle or bell buttons, about 2 volts will be added or subtracted from these values respectively, as expected. Just wondering what would cause this offset from equilibrium?
Does the TIU control variable voltages in a similar way to the Lionel Powermaster? If this were a Powermaster I could envision that the partial failure of a negative phase FET might be involved in this unbalance. If something similar is possible on the TIU, I wonder which components in the TIU should be replaced?
AC Voltage DC Offset Voltage
22.0 -0.03 (negligible offset)