Toshiba 2857DD - Installation and Service Adjustments; General Information for Installation; Automatic Degaussing Process; High Voltage Check Procedure

WARNING:
BEFORE
SERVICING
THIS
CHASSIS,
READ
THE
“X-RAY
RADIATION
PRECAUTION’,
“SAFETY
PRECAUTION”
AND
“PRODUCT
SAFETY
NOTICE”
ON
PAGE
2
OF
THIS
MANUAL.
INSTALLATION AND SERVICE ADJUSTMENTS
GENERAL INFORMATIONS
All adjustments are thoroughly checked and corrected
when the receiver leaves the factory. Therefore the
receiver should operate normally and produce proper
colour and B/W pictures upon installation. However,
several minor adjustments may be required
depending on the particular location in which the
receiver is operated.
This receiver is shipped completely in cardboard
carton. Carefully draw out the receiver from the carton
and remove all packing materials. Plug the power cord
into a convenient 220 volts 50 Hz AC two pin power
outlet. Turn the receiver ON. Check and adjust all the
customer controls such as BRIGHTNESS,
CONTRAST and COLOUR Controls to obtain natural
colour or B/W picture.
AUTOMATIC DEGAUSSING
A degaussing coil is mounted around the picture tube
so that external degaussing after moving the receiver
is normally unnecessary, providing the receiver is
properly degaussed upon installation. The degaussing
coil operates for about 1 second after the power to the
receiver is switched ON. If the set is moved or faced
in a different direction, the power switch must be
switched off at least 30 minutes in order that the
automatic degaussing circuit operates properly.
Should the chassis or parts of the cabinet become
magnetized to cause poor colour purity, use an
external degaussing coil. Slowly move the degaussing
coil around the faceplate of the picture tube, the sides
and front of the receiver and slowly withdraw the coil
to a distance of about 2 m before disconnecting it
from AC source.
HIGH VOLTAGE CHECK
CAUTION: There is no HIGH VOLTAGE ADJUST-
oe on this chassis.
. Connect an accurate high voltage meter to the
second anode of the picture tube.
2. Turn on the receiver. Set the BRIGHTNESS and
CONTRAST Controls to minimum (zero beam
current).
3. High voltage will be measured below 32.0 kV.
4. Rotate the BRIGHTNESS Control to both extremes
to be sure the high voltage does not exceed the
limit of 32.0 kV under any conditions.
FOCUS ADJUSTMENT
Adjust FOCUS Control on FLYBACK TRANS. (1461)
for well defined scanning lines in the centre area on
the screen.,