Tenma Test Equipment 72-2005

Confirm that you are qualified personnel to perform this procedure

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

Is the power supply not operating?

Are the CV or CC indicators not lighting?

Describe the cause of the blown fuse

Acknowledge that the following instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing other than contained in the operating instructions unless you are qualified to do so.

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