Sharp VE-CG40U Service Manual download pdf (Page 2)

VE-CG30U

VE-CG40U

1. IMPORTANT SERVICE NOTES

BEFORE RETURNING THE VIDEO CAMERA

RECORDER

Before returning the video camera 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 camera

recorder.

2. Inspect all protective devices such as non-metallic

control knobs, insulating materials, cabinet backs,

adjustment and compartment covers or shields, isola-

tion resistor/capacitor networks, mechanical insula-

tors etc.

3. To be sure that no shock hazard exists, check for

leakage 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 l.5k ohm, 10 watt resistor

paralleled by a 0.15µF capacitor in series with all

exposed metal cabinet parts and a known ground,

such as a water pipe or conduit.

· Use a VTVM or VOM with 1000 ohm per volt, or higher

sensitivity or measure the AC voltage drop across 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 adaptor plug must be used but only for the

purpose of completing these checks) on the set and

repeat the AC voltage measurements for each ex-

posed 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 video camera recorder

to the user.

VTVM

AC SCALE

1.5k ohms

10W

CONNECT TO

KNOWN EARTH

GROUND

TO EXPOSED

METAL PARTS

0.15 µF

TEST PROBE

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Sharp VE-CG40U Service Manual Page 2

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