servicing this chassis.
1. Since the power supply circuit of this receiver is directly connected to
the AC power line. An isolation transformer should be used during any
dynamic service to avoid possible shock hazard.
2. Always discharge the picture tube anode to the CRT conductive coating
before handling the picture tube. The picture tube is highly evacuated and
if broken, glass fragments will be violently expelled. Use shatterproof
goggles and keep picture tube away from the unprotected body while
handling.
3. When replacing a chassis in the cabinet, always be certain that all the
protective devices are put back in place, such as: nonmetallic control;
knobs, insulating covers, shields, isolation resistor-capacitor, network, etc.
4. When replacing parts or circuit boards, disconnect the power cord.
5. When replacing a high voltage resistor (metal oxide resistor) on circuit
hoard, keep the resistor APP. 10mm(1/2 in.) away from circuit board.
6. Connection wires must be kept away from components with high
voltage or high temperature.
7. If any fuse in this TV receiver is blown, replace it with the FUSE
specified in the chassis parts list.
8. The receiver is designed to operate with 230V(50Hz) AC mains.
PRODUCT SAFERY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related
characteristics are often passed unnoticed by a visual inspection and the X-RAY
RADIATON protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage. The use of substitute replacement
parts that do not have the same safety characteristics as specified in the parts list may
create shock, fire, X-RAY RADIATION or other hazards.
GENERAL ADJUSTMENT
AUTOMATIC DEGAUSSING
An automatic degaussing coil is attached around the picture tube, degaussing the tube
properly in about one second after the set is switched on. If the receiver is moved or
faced on a different direction, the power must be switched off at least 15 minutes in
order that the automatic degaussing circuit operated properly. External degaussing is
necessary if the automatic degassing proves ineffective after the set is moved.
B+ ADJUSTMENT
C
AUTION: To avoid X-ray hazards and result in a nominal display width, B+ voltage
must be set in the scale of 140.0V+/-1.0V.
1.
Make sure the AC power supply is 230V, 50Hz.
2.
Switch on the TV receiver, tune in an active channel.
3.
Measure the voltage between C641 on Main P.C. Board by DC voltmeter.
4.
Set contrast, brightness, color to maximum.
5.
Adjust VR631 on Main P. C. Board for B+140.0V+/-1.0V voltage reading.
HIGH VOLTAGE CHECK
C
AUTION: There is no high voltage adjustment in this chassis, B+140V voltage
