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Crystal Surround Air
Track
Model Name HW-D450
Model Code HW-D450/XN
SERVICE MANUAL
Crystal Surround Air Track
HW-D450
Refer to the service manual in the GSPN (see the rear cover) for more information.
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 Figure 1.1 AC Leakage Test:
WARNING
Do not use an isolation transformer during this test. Use a leakage-current tester or a metering system that complies
with American National Standards Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters
Laboratories (UL Publication UL1410, 59.7).
With the unit completely reassembled, plug the AC cord directly into a 120V 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.
LEAKAGE (READING
DEVICE CURRENT SH OULD NOT BE
UNDER TES TER ABOVE 0.5mA)
TES T
TES T ALL
EXPO S ED METAL
SU RFACES
2-WIRE CORD
ALSO TES T WITH
PLUG REVER S ED
(US ING AC EARTH
ADAPTER P LUG GROUND
AS R EQ UIRED)
Figure 1.1 AC Leakage Test
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