Sharp 27F640 Service Manual page 6

27F640
27F641
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 "V01" to "M05". Select the
item you wish to adjust.
3. Data number selection
Press the Vol-up or Vol-down button to adjust the data
number.
SERVICE ADJUSTMENT NUMBER
To enter the service mode and exit serv-
ice mode.
To enter the service mode manually just press and hold
the Vol-down and Ch-up buttons at the same time, plug
the AC cord into a wall socket.
Now the TV set is switched on and enters the service
mode.
To exit the service mode, turn the television off by
pressing the power button.
DATA NUMBER
CHANNEL
V05 3F(063)
Figure A.
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