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B-500/A/BiG
IMPORTANT SERVICE NOTES
BEFORE RETURNING THE ELECTRONIC WHITE
e
BOARD
Before returning the electronic white board to the
user, perform the following safety checks.
1. Inspect all lead dress to make
certain that leads
are not pinched or that hardware
is not lodged
between the chassis and other metal parts in the
electronic white board.
. Inspect all protective devices such as non-metallic
control knobs, insulating materilas, cabinet backs,
adjustment
and compartment
covers or shields,
isolation
resistor/capacitor
networks,
mechanical
insulators etc.
. To be sure that no shock hazard exists, check for
leakage current in the following manner.
@ Plug the AC line cord directly into a 200 ~ 240V
AC outlet (Do not use an isolation transformer
for this test).
VTVM
© AC SCALE
O
O.15uF
TEST PROBE () connect TO
KNOWN EARTH
TO EXPOSEO
\
GROUND
METAL PARTS
Using two clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15yF capacitor in series
with all exposed metal cabinet parts and a known
earth ground, such as a water pipe or conduit.
Use a VTVM or VOM with 1000 ohm per volt., or
higher, sensitivity to measure the AC voltage drop
acros the resistor (See Diagram).
Move the resistor connection to all exposed metal
parts having a return path to the chassis (antenna-
connections,
metal
cabinet,
screw
heads,
knobs
and
control
shafts,
etc.) and
measure
the AC
voltage drop across the resistor.
Reverse the AC
plug (a non-polarized adapter plug must be used
but
only
for the
purpose
of completing
these
checks)
on the set and
repeat the AC voltage
measurements
for each
exposed
metallic
part.
Any
reading
of 0.45V
rms
(this corresponds
to
0.3mA rms AC.) or more is excessive and indicates
a potential shock hazard which must be corrected
before returning the electronic white board to the
user.
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO WET LOCATIONS.
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