Toshiba 20AR33, Service Manual

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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 item 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 item will vary in increments
of one. 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 the service mode and exit serv-
ice mode.
Short JA137&JA138 for 1 Second and release to switch
to the service mode position, and the microprocessor is
in input mode.(Adjustment through the I
2
C bus control.)
To exit the service mode, turn the television off by
pressing the power button.
25 AGC:
DATA NUMBER SERVICE ADJUSTMENT ITEM
Figure A.
20AR33