Sharp VC-H9888U Service Manual page 2

VC-H9888U
BEFORE RETURNING THE VIDEO CASSETTE
RECORDER
Before returning the video cassette recorder 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 video cassette recorder.
2. Inspect all protective devices such as non-metallic control
knobs, insulation materials, cabinet backs, adjustment and
compartment covers or shields, isolation resistor/capacitor
networks, mechanical insulators etc.
3. To be sure that no shock hazard exists, check for current in the
following manner.
Plug the AC line cord directly into a 120 volt AC outlet (Do not
use an isolation transformer for this test).
Using two clip leads, connect a 1.5k ohm, 10 watt resistor
paralleled by a 0.15µF capacitor in series with all exposed
metal cabinet parts and a known earth ground, such as a water
pipe or conduit.
Use an SSVM or VOM with 1000 ohm per volt, or higher,
sensitivity or measure the AC voltage drop across the resisor
(See Diagram).
Move the resistor connection to earth exposed metal part
having a return path to the chassis (antenna, metal cabinet,
screw heads, knobs and control shafts, etc.) and measure the
AC voltage drop across the resistor. Reverse the AC plug on
the set and repeat AC voltage measurements for each exposed
IMPORTANT SERVICE NOTES
WARNING : TO REDUCE THE RISK OF FIRE OR ELEC-
TRIC SHOCK, DO NOT EXPOSE THIS AP-
PLIANCE TO RAIN OR MOISTURE.
RISK OF ELECTRIC SHOCK
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER-SERVICEABLE PARTS IN-
SIDE. REFER SERVICING TO QUALIFIED SERVICE PER-
SONNEL.
This symbol warns the user of uninsulated voltage
within the unit that can cause dangerous electric shocks.
This symbol alerts the user that there are important
operating and maintenance instructions in the literature
accompanying this unit.
CAUTION:
This symbol mark means fast operating fuse.
For continued protection against risk of fire, replace
only with same type fuse F901 (1.6A, 125V).
1.6A 125V
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 video
cassette recorder to the owner.
TO EXPOSED
METAL PARTS
CAUTION
DO NOT OPEN
2
SSVM
AC SCALE
1.5k ohms.
10W
0.15 µF
TEST PROBE
CONNECT TO
KNOWN EARTH
GROUND