Tenma Test Equipment 72-2075

WARNING: Qualified Personnel Only

Ensure the power cord is unplugged

Set the AC selects switch to the desired line voltage position

Install the correct fuse value as listed on rear panel

Ensure you are qualified to perform this procedure.

Disconnect the power cord before replacing the fuse.

Check if the CV or CC indicators are not lighting up.

Determine if the power supply is not operating.

Identify and correct the cause of the blown fuse.

Locate the fuse on the rear panel (see Fig. 4-3).

Replace the fuse with the correct rating and type

Confirm that you are qualified to perform these adjustments

Adjustment of the Rating Voltage

Connect an accurate (±0.1%) external multimeter to measure the dc voltage at output terminals of the power supply

Set the COARSE and FINE VOLTAGE controls to minimum (fully counterclockwise)

Turn the COARSE and FINE VOLTAGE controls to maximum (fully clockwise)

Adjust trimmer pot VR105 for a reading of rate volts x 1.05 on the multimeter

Set the COARSE and FINE VOLTAGE controls for a reading of rate volts on the multimeter

Adjust trimmer pot VR301 (VR201 digital type) for a reading of rate volts on the voltmeter (Digital Panel meter, digital type) of the power supply

Use a soft cloth dampened in a solution of mild detergent and water

Ensure no cleaner is sprayed directly onto the instrument

Avoid using the following chemicals

Avoid using abrasive cleaners on any portion of the power supply