Always
respect voltages. While some may not be dangerous in themselves, they can cause
unexpected reactions that are best avoided. Before reaching into a powered TV
set, it is best to test the high voltage insulation. It is easy to do, and is a
good service precaution. It makes sense
to avoid exposure to electrical shock.
While some sources are expected to have a possible dangerous impact,
others of quite high potential are of limited current and are sometimes held in
less regard.
When servicing the high
voltage system, remove static charge from it by connecting a 10K ohm resistor
in series with an insulated wire (such as a test probe) between picture tube
dag and 2nd anode lead. (AC line cord should be disconnected from AC outlet.)
1) Picture tube in this receiver employs integral implosion protection.
2) Replace with the same type number of picture tube for continued safety.
3) Do not lift picture tube by the neck.
4) Handle the picture tube only when wearing shatterproof goggles and after
discharging the high voltage completely.
Press and hold the local key “vol
down” and “channel up” when power on the
main switch, TV will enter into the service mode in adjustment mode. (the
initial value of the EEPROM are automatically preset when the new EEPROM is
used). Service mode also can be reached
by pressing the service key (code: 40Hex)
Press the channel up or dn key on the
remote controller to select the items one by one in adjustment mode.
Using the volume up or down key on the
remote controller, the data can be modified.
When press the local key “Vol Down and
Channel Up” at the same time, it will be released from the service mode.
Press the Menu key on the remote control to enter into
the NVM mode. Press menu key again to
leave the NVM mode return to adjustment mode.
(it is not recommended to modify the data unless as listed in BUS SETUP
data)
Press both channel up and volume down
buttons on the TV set simultaneously or press the “service”(40HEX) key again,
it will switch to the normal mode position, and the microprocessor is out of
service mode.
Default locking password “0000”
Factory presetting
Press remote controller key of code
“ED” for 4 seconds, the initial values
are automatically preset.
Make sure whether the data need to
modify or not (initial data)
If haven’t done this initialization,
malfunction might happen.
Below are the adjustment items that
should be done, otherwise some adjustment items will not be accurate.
Schematic diagram and
PWB
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