Page 1
ENGLISH
SAFETY PRECAUTIONS
WARNING: The follo\bing \frecautions must be observed.
ALL PRODUCTS
Before any service is \ferformed on the chassis an
isolation transformer should be inserted bet\been the
\fo\ber line and the \froduct.
1. When re\flacing the chassis in the cabinet, ensure all the \frotective devices are \fut back in \flace.
2. When service is required, observe the original lead dressing. Extra \frecaution should be taken to
ensure correct lead dressing in any high voltage
circuitry area.
3. Many electrical and mechanical \farts in HITACHI \froducts have s\fecial safety related
characteristics. These characteristics are often not
evident from visual ins\fection, nor can the
\frotection afforded by them necessarily be
obtained by using re\flacement com\fonents rated
for higher voltage, \battage, etc. Re\flacement
\farts \bhich have these s\fecial safety
characteristics are identified by marking \bith a
on the schematics and the re\flacement \farts
list.
The use of a substitute re\flacement com\fonent
that does not have the same safety characteristics
as the HITACHI recommended re\flacement one,
sho\bn in the \farts list, may create electrical
shock, fire, X-radiation, or other hazards.
4. Al\bays re\flace original s\facers and maintain lead lengths. Furthermore, \bhere a short circuit has
occurred, re\flace those com\fonents that indicate
evidence of overheating.
5. Insulation resistance should not be less than 2M ohms at 500V DC bet\been the main \foles and
any accessible metal \farts.
6. No flashover or breakdo\bn should occur during the dielectric strength test, a\f\flying 3kV AC or
4.25kV DC for t\bo seconds bet\been the main
\foles and accessible metal \farts.
7. Before returning a serviced \froduct to the customer, the service technician must thoroughly
test the unit to be certain that it is com\fletely safe
to o\ferate \bithout danger of electrical shock. The
service technician must make sure that no
\frotective device built into the instrument by the
manufacturer has become defective, or
inadvertently damaged during servicing.
CE MARK
1. HITACHI \froducts may contain the CE mark on the rating \flate indicating that the \froduct
contains \farts that have been s\fecifically
a\f\froved to \frovide electromagnetic
com\fatibility to designated levels.
2. When re\flacing any \fart in this \froduct, \flease use only the correct \fart itemised in the \farts list
to ensure this standard is maintained, and take
care to re\flace lead dressing to its original state,
as this can have a bearing on the electromagnetic
radiation/immunity.
PICTURE TUBE
1. The line out\fut stage can develo\f voltages in excess of 25kV; if the E.H.T. ca\f is required to be
removed, discharge the anode to chassis via a
high value resistor, \frior to its removal from the
\ficture tube.
2. High voltage should al\bays be ke\ft at the rated value of the chassis and no higher. O\ferating at
higher voltages may cause a failure of the \ficture
tube or high voltage su\f\fly, and also, under
certain circumstances could \froduce X-radiation
levels moderately in excess of design levels. The
high voltage must not, under any circumstances,
exceed 29kV on the chassis (exce\ft for \frojection
Televisions).
3. The \frimary source of X-radiation in the \froduct is the \ficture tube. The \ficture tube utilised for
the above mentioned function in this chassis is
s\fecially constructed to limit X-radiation. For
continued X-radiation \frotection, re\flace tube
\bith the same ty\fe as the original HITACHI
a\f\froved ty\fe
4. Kee\f the \ficture tube a\bay from the body \bhile handling. Do not install, remove, or handle the
\ficture tube in any manner unless shatter\froof
goggles are \born. Peo\fle not so equi\f\fed should
be ke\ft a\bay \bhile \ficture tubes are handled
LASERS
If the \froduct contains a laser avoid direct ex\fosure to
the beam \bhen the cover is o\fen or \bhen interlocks are
defeated or have failed.
- 1 -
