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MD20080
SERVICE MANUAL
COLOR TELEVISION RECEIVER
ORIGINAL
CHASSIS CODE B
Design and specifications are subject to change without notice.
SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES 6. AVOID AN X-RAY
As for the places which need special attentions, Safety is secured against an X-ray by consider-
they are indicated with the labels or seals on the ing about the cathode-ray tube and the high
cabinet, chassis and parts. Make sure to keep the voltage peripheral circuit, etc.
indications and notices in the operation manual. Therefore, when repairing the high voltage pe-
2. AVOID AN ELECTRIC SHOCK ripheral circuit, use the designated parts and
There is a high voltage part inside. Avoid an make sure not modify the circuit.
electric shock while the electric current is Repairing except indicates causes rising of high
flowing. voltage, and it emits an X-ray from the cathode-
ray tube.
3. USE THE DESIGNATED PARTS
The parts in this equipment have the specific 7. PERFORM A SAFETY CHECK AFTER
characters of incombustibility and withstand SERVICING
voltage for safety. Therefore, the part which is
replaced should be used the part which has Confirm that the screws, parts and wiring which
the same character. were removed in order to service are put in the
Especially as to the important parts for safety original positions, or whether there are the
which is indicated in the circuit diagram or the portions which are deteriorated around the
table of parts as a mark, the designated serviced places serviced or not. Check the
parts must be used. insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
4. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER (INSULATION CHECK PROCEDURE)
ASSEMBLING OR WIRING 1. Unplug the plug from the AC outlet.
There are parts which use the insulation 2. Remove the antenna terminal on TV and turn
material such as a tube or tape for safety, or on the TV.
which are assembled in the condition that 3. Insulation resistance between the cord plug
these do not contact with the printed board. terminals and the eternal exposure metal
The inside wiring is designed not to get closer [Note 2] should be more than 1M ohm by
to the pyrogenic parts and high voltage parts. using the 500V insulation resistance meter
Therefore, put these parts in the original [Note 1].
positions. 4. If the insulation resistance is less than 1M
ohm, the inspection repair should be
5. TAKE CARE TO DEAL WITH THE required.
CATHODE-RAY TUBE [Note 1]
In the condition that an explosion-proof cathode- If you have not the 500V insulation
ray tube is set in this equipment, safety is resistance meter, use a Tester.
secured against implosion. However, when
[Note 2]
removing it or serving from backward, it is
External exposure metal: Antenna terminal
dangerous to give a shock. Take enough care to
Earphone jack
deal with it.
HOW TO ORDER PARTS
Please include the following informations when you order parts. (Particularly the CHASSIS CODE.)
1. MODEL NUMBER and CHASSIS CODE
You canfind it in the back of your unit.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.
IMPORTANT
Inferior silicon grease can damage IC's and transistors.
When replacing an IC's or transistors, use only specified silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
A1-1
ABOUT LEAD FREE SOLDER (PbF)
Distinction of PbF PCB:
PCBs (manufactured) using lead free solder will have a PbF printing on the PCB.
(Please refer to figures.)
Caution: