B&K Precision 393 - Manual - Manual (Page 28)

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10 Maintenance
Do not expose the LCD display to direct sunlight for long periods
of time.
Cleaning
If the instrument requires cleaning, disconnect it from all power
sources and clean only with a mild detergent and water. Be
sure the instrument is completely dry before reconnecting it to
any power source.
To clean the exterior surface:
1. Remove loose dust on the outside of the instrument
and probes with a lint-free cloth.
2. Use a soft cloth dampened with water to clean the
instrument.
Note: To avoid damaging the surface of the instrument and
probes, do not use any chemically abrasive cleaning agents.
BATTERY AND FUSE REPLACEMENT
WARNING
TO AVOID ELECTRICAL SHOCK, DISCONNECT THE TEST LEADS
AND ANY INPUT SIGNALS BEFORE REPLACING THE BATTERY.
REPLACE ONLY WITH SAME TYPE OF BATTERY.
1. Disconnect test leads from any live source, turn the rotary
switch to OFF, and remove the test leads from the input
terminals.
2. The bottom case is secured to the top case by four screws.
Using a Phillips-head screwdriver, remove the screws from the
bottom case and remove the bottom case.
3. Remove battery and replace with a new equivalent " NEDA
1604 " 9-volt battery.
4. Fuse: F1 / 0.5A / 1000V fast blow ceramic fuse (6.3 x 32 mm
size)
5. Fuse: F2 / 20A / 600V fast blow ceramic fuse (10 x 38 mm
size).
6. Replace the bottom case and reinstall the screws.