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S E C T I O N
V
M A I N T E N A N C E
5 . 1 INTRODUCTION
WARNING
This section contains information
necessary to maintain the Model
DRC-93C.
General maintenance, fuse
replacement, line voltage selection
and performance testing is con-
tained in this section.
5.2
GENERAL
MAINTENANCE
Clean the DRC-93C periodically to
remove dust, grease and other con-
taminants.
Use the following pro-
cedure
:
1 .
Clean the front and back panels
and case with a soft cloth damp-
ened with a mild detergent and
water solution.
Note
:
DO
NOT
use
aromatic
hydrocarbons or chlorinated
sol-
vents to clean the DRC-93C. They
may react with the plastic mater-
ials used in the unit or the silk
screen printing on the back panel.
2. Clean the surface of the printed
circuit
boards
(PCB)
using
clean, dry air at low pressure.
If grease is encountered, spray
with Freon T.F. degreaser and
4.
Replace the fuse per Table
2-1.
remove grime with
dry,
low-pres-
sure air.
5 .
Replace fuse holder, close fuse
compartment and connect power
cord.
5 . 3
FUSE
REPLACEMENT
The line fuse is accessible from
the rear of the DRC-93C.
Use the
The rear-panel, three-pronged line
following procedure to check and/or
power connector permits the DRC-
replace the fuse:
93C to be connected to
100, 120,
220,
or 240 VAC line voltages.
Use
the following procedure to change
the line voltage:
5.4
LINE
VOLTAGE
SELECTION
COPYRIGHT 3/88
5-1
To prevent shock hazard, turn
off instrument and disconnect
it from AC line power and all
test equipment before replacing
the fuse.
1 .
Set the
POWER
switch to OFF and
disconnect the power cord from
the unit.
The fuse compartment
is located just to the right of
the power connector.
2.
Open the fuse compartment by
prying open the cover with a
small screw driver.
3.
Remove the lower fuse holder by
sliding it out of its position
with the aid of the small screw
driver.
CAUTION
For continued protection against
fire hazard, replace only with
the same type and rating of fuse
as specified for the line
for the line voltage selected.
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