Adjustment Procedures - Sharp 28JS-74SS Service Manual

All adjustments to this chassis, except for focus, are carried out in the Service Mode.
• • • • • 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.
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 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.
• • • • • 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:
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.
Adjustment menu:
The following adjustments can be carried out in the Service Mode.
• Horizontal Shift
• East West Width
• Pin Phase
• Pin Amp
• Upper corner correction
• Lower corner correction
• Extreme Corner Correction
• Vertical Linearity
• Vertical angle
• Vertical bow
• Vertical Amplitude
• S Correction
• Vertical Shift
• Red Cut Off
• Green Cut Off

ADJUSTMENT PROCEDURES

SERVICE SOFTWARE version ∗∗.∗∗
SW on: XXXX SW off: XXXX Hours ON: XXXX
• Blue Cut Off
• Alter NVM Pag (Page)
• Alter NVM Pos (Position)
• Alter NVM Val (Value)
• Teletext Mix Mode Contrast
• Teletext Contrast
• OSD Contrast
• DVCO Adjustment (Only PAL)
• DVCO Adjustment (Only NTSC)
• AGC Adjustment
• Auto Installation On/Off
7
28JS-74S
CH
4
5
Figure 1