E15
5. MAINTENANCE
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.
5-1 Fuse Replacement
If the fuse is blown, the CV or CC indicators will not light and the power supply will not operate. The fuse should not
normally blow unless a problem has developed in the unit. Try to determine and correct cause of the blown fuse, then
replace only with a fuse of the correct rating and type.
The fuse is located on the rear panel (see Fig. 3-2).
WARNING: For continued fire protection. Replace fuse only with 250V fuse of the specified type
and rating, and disconnect the power cord before replacing fuse.
5-2 Line Voltage Conversion
The primary winding of the power transformer is tapped to permit operation from 100, 120, 220, or 230 VAC, 50/60
Hz line voltage. Conversion from one line voltage to another is done by changing AC selects switch as shown in Fig. 3-
2.
The unit is set to default line voltage. To convert to different line voltage, perform the following procedure:
(1)
Make sure the power cord is unplugged.
(2)
Change the AC selects switch to the desired line voltage position.
(3)
A change in line voltage may also require a corresponding change of fuse value. Install the correct fuse value as
listed on rear panel.
5-3 Internal Adjustments
The unit was accurately adjusted at the factory before shipment. Readjustment is recommended only if repairs have
been made in a circuit affecting adjustment accuracy, or if you have a reason to believe the unit is out of accuracy.
However, adjustments should be attempted only if a multimeter with an accuracy of
±
0.1% dcv or better is available.
WARNING