Product Safety Notice - Toshiba 2857DD Service Manual

SAFETY INSTRUCTIONS
X-RAY RADIATION PRECAUTION
. The E.H.T. must be checked every time the
receiver is serviced to ensure that the C.R.T. does
not emit X-ray radiation as result of excessive
E.H.T. voltage. The nominal E.H.T. for this receiver
is 31.5 kV at zero beam current (minimum
brightness) operating at 220V a.c. The maximum
E.H.T. voltage permissible in any operating
circumstances must not exceed 32.0 kV. When
checking the E.H.T., use the 'High Voltage Check'
procedure in this manual using an accurate E.H.T.
voltmeter.
2. The only source of X-RAY radiation in this receiver
is the C.R.T. To prevent X-ray radiation, the
replacement C.R.T. must be identical to the original
fitted as specified in the Parts List.
. Some components used in this receiver have safety
related characteristics preventing the C.R.T. from
emitting X-ray radiation.
For continued safety, replacement component
should only be made after referring the Product
Safety Notice below.
SAFETY PRECAUTION
. This receiver has a nominal working E.H.T. voltage
of 28.5 kV. Extreme caution should be exercised
when working on the receiver with the back
removed.
Do not attempt to service this receiver if you are
not conversant with the precautions and procedures
for working on high voltage equipment.
When handling or working on the C.R.T., always
discharge the anode to the receiver chassis before
removing the anode cap
The C.R.T., if broken, will violently expel glass
fragments. Use shatter proof goggles and take
extreme care while handling.
Do not hold the C.R.T. by the neck as this is a very
dangerous practice.
2. It is essential that to maintain the safety of the
customer all cable forms be replaced exactly as
supplied from factory.
3. A small part of the chassis used in this receiver is,
when operating, at approximately half mains
potential at all times. It is therefore essential in the
interest of safety that when serving or connecting
any test equipment the receiver should be supplied
via a suitable isolating transformer of adequate
rating.
. Replace blown fuses within the receiver with the
fuse specified in the parts list.
. When replacing wires or components to terminals
or tags, wind the leads around the terminal before
soldering. When replacing safety components
identified by the international hazard symbols on
the circuit diagram and parts list, it must be a
Toshiba approved type and must be mounted as
the original.
. Keep wires away from high temperature compo-
nents.
PRODUCT SAFETY NOTICE
Many electrical and mechanical components in this chassis have special safety-related characteristics. These
characteristics are often passed unnoticed by a visual inspection and the X-ray radiation protection afforded by
them cannot necessarily be obtained by using replacements rated at higher voltages or wattage, ett.
Components which have these special safety characteristics in this manual and its supplements are identified by
the international hazard symbols on the schematic diagram and parts list. Before replacing any of thes=
components read the parts list in this manual carefully. Substitute replacement components which do not have
the same safety characteristics as specified in the parts list may create X-ray radiation.