Toshiba 20AR20, Service Manual

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6
20AR20/30
For adjustments of this model, the bus data is converted to various analog signals by the D/A converter
circuit.
Note: There are still a few analog adjustments in this series such as focus and master screen voltage.
Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv-
ice adjustments are Required.
1. Service mode
Before putting unit into the service mode, check that
customer adjustments are in the normal mode. Use
the reset function in the video adjustment menu to
ensure customer controls are in their proper (reset)
position.
2. Service number selection
Once in the service mode, press the Ch-up or Ch-
down button on the remote controller or at the set.
The service adjustment number will vary in
increments of one, from "S01" to "M05". Select the
item you wish to adjust.
3. Data number selection
Press the Vol-up or down button to adjust the data
number.
To enter and exit service mode.
While pressing the Vol-up and Ch-up buttons at the
sametime, plug the AC cord into a wall socket.
The TV is now switched on and enters service mode.
To exit the service mode, turn the television off by
pressing the power button.
Figure A.
S01
02
CHANNEL
SERVICE ADJUSTMENT NUMBER
S01 D:00
DATA NUMBER
(HEX)
55