Sharp 66ES-D7H (serv.man2) Service Manual ▷ View online
DA100 (50Hz) Chassis – Article for Television Magazine
Page 69 of 80
Sharp Electronics (UK) Limited - March 2003
Service Mode
All adjustments to this chassis, except for focus, are carried out in the service mode.
The service mode is provided to enable the engineer to correctly set up the receiver to the CRT fitted
in the set. Note that these adjustments may vary from one receiver to another.
The service mode is provided to enable the engineer to correctly set up the receiver to the CRT fitted
in the set. Note that these adjustments may vary from one receiver to another.
Entering the Service Mode
To enter the service mode, carry out the following procedure:
1. Connect a test pattern to the antenna terminal.
2. Tune the receiver to this signal.
3. Turn the receiver off using the mains switch.
4. Press volume down and channel up buttons on the front
1. Connect a test pattern to the antenna terminal.
2. Tune the receiver to this signal.
3. Turn the receiver off using the mains switch.
4. Press volume down and channel up buttons on the front
of the receiver at the same time.
5. Keeping these buttons pressed, turn the mains on.
6. When the set starts up it will be in service mode.
7. Release the two buttons.
6. When the set starts up it will be in service mode.
7. Release the two buttons.
Use the channel up and down buttons to move between the options.
Use the volume control buttons to change the data.
To store the data, use the stand-by button on the remote control.
To exit the service mode, turn the receiver off using the mains switch.
When the service mode is entered the following On Screen Display appears
-SERVICE SOFTWARE AND HEXADECIMAL COUNTER DISPLAY:
SW ON XXXX SW OFF XXXX HOURS ON XXXX
The figures displayed in the XXXX locations are hexadecimal representations of the number of times
that particular function has been executed. For example if the hexadecimal number displayed after
SW ON was 0E4A, this would correspond to the receiver being turned on 3658 times.
The following adjustments can be carried out in the service mode:
that particular function has been executed. For example if the hexadecimal number displayed after
SW ON was 0E4A, this would correspond to the receiver being turned on 3658 times.
The following adjustments can be carried out in the service mode:
Horizontal Shift
East West Width
Pin Phase
Pin Amp
Corner Amplitude
Corner Symmetry
Vertical Linearity
Vertical Amplitude
S Correction
Vertical Shift
Red Gain
Green Gain
Blue Gain
Red Cut Off
Green Cut Off
Blue Cut Off
Alter NVM Page
Alter NVM Position
Alter NVM Value
Teletext Mix Mode Contrast
Teletext Contrast
OSD Contrast
DVCO Adjustment (NTSC)
DVCO Adjustment (PAL)
AGC Adjustment
AFT Adjustment
OPC Value
Auto Installation On/Off
Revision 2
DA100 (50Hz) Chassis – Article for Television Magazine
Geometry Adjustments
All geometry adjustments are based on an internally generated test pattern as shown below. When
carrying out any of the above geometry adjustments, use the internally generated test pattern for
guidance.
carrying out any of the above geometry adjustments, use the internally generated test pattern for
guidance.
G2 Setting
Follow the procedure below to set the G2 and Grey scale:
1. Tune the set to the output of a RF signal generator.
2. In the user menu, set the picture levels to the FACTORY settings.
3. In the user menu, set the tint control to its central position.
4. Enter the test mode.
5. Set the ABL levels in the NVM by adjusting positions 60, 61, 62, 63, 64 and 65 on page 00 to read
1. Tune the set to the output of a RF signal generator.
2. In the user menu, set the picture levels to the FACTORY settings.
3. In the user menu, set the tint control to its central position.
4. Enter the test mode.
5. Set the ABL levels in the NVM by adjusting positions 60, 61, 62, 63, 64 and 65 on page 00 to read
80. Store each location by pressing the standby button on the remote control.
6. When the ABL levels have been set, adjust the G2 and grey scale (if necessary) as below.
G2 Adjustment
After setting the ABL levels as above, go to the Red Cut Off adjustment. The following data will
appear on the screen.
appear on the screen.
Using a cross hatch pattern set the G2 control on the line output transformer so that the display in
the Red cut off box reads between 60 and 80 as indicated above.
Important
After setting the G2 control, it is necessary to re-set at least one of the RGB adjustments to force
the software to re-set the correct ABL levels. Just adjust one of the grey-scale gain or drives by one
point. There is no need to press the standby button to store this adjustment.
Page 70 of 80
Sharp Electronics (UK) Limited - March 2003
Revision 2
DA100 (50Hz) Chassis – Article for Television Magazine
Page 71 of 80
Sharp Electronics (UK) Limited - March 2003
Revision 2
Grey Scale Adjustment
1. Using a grey scale pattern set the Red Cut-off value to 32 and the Red Gain value to 50.
2. Leave the Red Cut Off and Gain as above and adjust Green and Blue Cut-off and Gain to achieve
2. Leave the Red Cut Off and Gain as above and adjust Green and Blue Cut-off and Gain to achieve
correct grey scale tracking. As with all grey scale adjustments it will be necessary to re-adjust
the settings to achieve good tracking.
the settings to achieve good tracking.
Note
When adjusting the grey scale, the figures displayed in the boxes are an indication of the CRT’s
performance only.
These adjustments are for guidance only. If any problems should be encountered the adjustments
should be carried out using a Colorimeter as explained in the service manual.
When adjusting the grey scale, the figures displayed in the boxes are an indication of the CRT’s
performance only.
These adjustments are for guidance only. If any problems should be encountered the adjustments
should be carried out using a Colorimeter as explained in the service manual.
DA100 (50Hz) Chassis – Article for Television Magazine
Page 72 of 80
Sharp Electronics (UK) Limited - March 2003
Revision 2
Voltage Tables
These tables are for guidance only
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