Tenma Test Equipment 72-2010

WARNING: Qualified Personnel Only

Ensure the power cord is unplugged

Record the current line voltage setting from the rear panel

Select the desired line voltage position on the AC selects switch

Verify the following fuse values based on the selected line voltage

Install the correct fuse value as listed on the rear panel

Is the AC selects switch set to the correct position?

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.

Adjustment of the Rating Current

Describe the cause of the blown fuse

Disconnect the power cord before replacing the fuse

Is the fuse located on the rear panel?

Replace the fuse with a 250V fuse of the specified type and rating

Ensure the fuse is securely placed in the holder

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

Ensure no cleaner is sprayed directly onto the instrument

Avoid using chemicals containing benzine, benzene, toluene, xylene, acetone, or similar solvents

Ensure no abrasive cleaners are used on any portion of the power supply