B&K Precision 1745A - Manual - Manual (Page 22)

22
MAINTENANCE
WARNING
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.
FUSE REPLACEMENT
If the fuse blows, the CV or CC indicators will not light and the
power supply will not operate. The fuse should not normally open
unless a problem has developed in the unit. Try to determine and
correct the cause of the blown fuse, then replace only with a fuse of
the correct rating as listed below. The fuse is located on the rear panel
(see Fig. 2).
OPERATION FUSE VALUE TYPE
120 V 6 A SLOW BLOW
220/230/240 V 3 A SLOW BLOW
Table 1. Fuse Values.
LINE VOLTAGE CONVERSION, INTERNATIONAL
UNITS
The primary winding of the power transformer is tapped to
permit operation from 120/220/230 or 240 VAC, 50/60 Hz
line voltage. Conversion from one line voltage to another is
done by a simple position change of the fuse receptacle
underneath the line cord.
ADJUSTMENTS
This 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 adjustment.
However, adjustments should be attempted only if a
multimeter with an accuracy of ±0.5% DCV or better is
available (B+K Precision Model 2703B or equivalent).