Charge Supply HI / LOW Voltage

The “CHG SUPPLY HI / LO VOL” indicates a discrepancy between the voltage signal sent to the Capacitor charger, which means the voltage at which it should charge the capacitors, and the Capacitor Charger's response to the setting on the display.

When a voltage to use is selected on the Laser display, the Control Board sends a value through R24 (TP22) to the Cap Charger to charge the capacitors to the required voltage.

When the capacitors reach the charge value, the Control Board receives Cap Charger Feedback, the equivalent value through R21 (TP33).

This value is within the range of 3.9VDC for 155 Volts up to 10VDC for 400 Volts, and its calculation formula is as described below.

(Display Voltage * 10) / 400

If a voltage of 200 Volts is selected on the Display, in R21 and R24, we will find a value of 5VDC, for example:

(200V * 10) / 400 = 5VDC

To take the measurement, using a voltmeter, touch the GND with the black probe, then touch the left side ferrule on resistor R21 and note the value. Repeat the same procedure again but now on resistor R24. Write down the value.

The discrepancy between the values, or a zero value in one or both, may indicate a problem with the DIO board, control board, or Cap charger. If the voltage at R24 corresponds to the voltage on the display and we are not receiving feedback from the Cap Charger at R21:

• Check the cable at J22. Ensure it is connected correctly to the control board and the Cap Charger. Test it by replacing the cable.

• Check the Cap charger. It should be working. Check the Cap Charger Fan. Check if the green LED is on.

If there is no voltage on R21 and R24 or the voltages we are getting do not match the voltage on the Laser display, replace the control board.

The same applies to this control board as for the Rabbit Control board. Please note that on the Raspberry control board, TP33 is the feedback from the Cap Charger.