Table of Contents
Advertisement
SAFETY PRECAUTION
WARNING: Service should not be attempted by anyone unfamiliar with the necessary precautions on this
projector. The following are the necessary precautions to be observed before servicing this chassis.
1. An isolation Transformer should be connected in the power line between the projector and the AC Iine
before any service is performed on the projector.
2. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in
place, such as; non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network
etc.
3. Before returning the set to the customer, always perform an AC Ieakage current check on the exposed
metallic parts of the cabinet, such as terminals, screwheads, metal overlays, control shafts etc. to be sure
the set is safe to operate without danger of electrical shock. Plug the AC Iine cord directly into a AC outlet
(do not use a line isolation transformer during this check). Use an AC voltmeter having 5000 ohm per volt
or more sensitivity in the following manner: Connect a1500 ohm 10W resistor, paralleled by a 0.15 uF, AC
type capacitor, between a known good earth
ground (water pipe, conduit, etc.) and the exposed
metallic parts, one at a time. Measure the AC
voltage across the combina-tion of 1500 ohm
resistor and 0.15 uF capacitor. Reverse the AC
plug at the AC outlet and repeat AC voltage mea-
surements for each exposed metallic part. Voltage
mea-sured must not exceed 5.25V(rms). This
corresponds to 3.5 mA(AC). Any value exceeding
this limit consti-tutes a potential shock hazard and
must be corrected immediately.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
charac-teristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot
neces-sarily be obtained by using replacement components rated for higher voltage, wattage, etc.
Replacement parts which have these special safety characteristics are identified in this manual and its
supplements; electrical components having such features are identified by the international hazard symbols
on the schematic diagram and the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitute
replacement parts which do not have the same safety characteristics as specified in the parts list may create
shock, fire or other hazards.
ULTRAVIOLET DANGER IN SERVICE MODE
Eye damage may result from directly viewing the light produced by the lamp used in this product. Always turn
off lamp before opening this cover. Ultraviolet radiation eye protection required during servicing.
Good earth ground
such as a water
pipe, conduit, etc.
0-2
AC VOLTMETER
0.15 uF
Place this probe on
each exposed
metallic part.
1500 ohm
10W
Advertisement
Table of Contents
