NOTE Problem: “ Er 43 *** “ error message is displayed. “***” is a number. Why? Wrong line voltage selection. Approximate measured line voltage (***) is shown in time display. How is it detected? CPU monitors the line voltage switch signal “MAINS” from Power SupplyBoard. Switch is in incorrect position. This error is generated during power up sequence if the line
voltage (derived from the +25V supply) is under 160 volts for 230V selection or over 160 volts for 110V selection. When the unit is connected to 230V line with 110V settings, fuses normally blow before this error is displayed. Possible cause: Check or test: Parts related: Line voltage switch in wrong position. Incorrect position of 110/230 switch may cause serious damage to the electrical circuits. Filament Control Board not operating, or not connected to CPU Board (signal MAFRQ). Check all four switches in Power Supply Board: they must be switched to the same position, left or right, depending on the nominal line voltage: 110 Vac: S1-S4
turned left 230 Vac:
S1-S4 turned right If the replacement of Power Supply Board did not help, replace the CPU Board. Check the wiring. Replace the board. Power Supply Board 1 CPU sets maximum mA reference. 2 CPU activates PREH signal to connect mA reference to the V/F- converter. 3 CPU measures the frequency coming from the V/F-converter. If the frequency is not high enough, Er 44 FIL is displayed.