Tenma Test Equipment 72-2015

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

Avoid spraying cleaner directly onto the instrument

Ensure no use of prohibited chemicals

Avoid using abrasive cleaners on any portion of the power supply

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 and describe the cause of the blown fuse.

Replace the fuse with the correct rating and type

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

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

Acknowledge that the instructions are for use by qualified personnel only and that no servicing other than contained in the operating instructions should be performed unless qualified.

Ensure the power cord is unplugged.

Select the desired line voltage position on the AC selects switch.

Install the correct fuse value as listed on the rear panel if a change in line voltage requires it.