1. Precaution
1. Precaution
Follow these safety instructions while servicing the ESD to prevent damage and to protect against potential hazards
such as electrical shock and X-rays.
1.1. Safety Precautions
1) When reinstalling the chassis and its assemblies, be sure to restore all of the protective devices, including the control
knobs and the compartment covers.
2) Make sure that there are no cabinet openings through which people (particularly children) can make contact with
dangerous internal components.
3) Design Alteration Warning:
Never alter or add to the mechanical or electrical design of the unit.
Example: Do not add auxiliary audio or video connectors. Such alterations might create a safety hazard.
Also, any design changes or additions will void the manufacturer’s warranty.
4) Leakage Current Hot Check
WARNING
Do not use an isolation transformer during this test. Use a leakage-current tester or a metering system that complies.
With the unit completely reassembled, plug the AC cord directly into a AC outlet. With the unit’s power switched from
the ON to the OFF position, measure the current between a known ground and all exposed metal parts.
Known Grounds - Earth
Known Metal parts - screwheads, metal cabinets, etc.
DEVICE
UNDER
TES T
LEAKAGE
CURRENT
TES TER
TES T ALL
EXPO SED METAL
SU RFACES
2-WIRE C ORD
ALSO TES T WITH
PLUG REVER SE D
(US ING AC
ADAPTER PLUG
AS R EQ UIRED)
EARTH
GROUND
(READING
SH OULD NOT BE
ABOVE 0.5m A)
Figure 1.1
AC Leakage Test
1-1
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