SHARP 28JS-74S _ SERVICE MODE & ADJUSTMENTS _ LED BLINKING CODES
TO ENTER 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. To enter the
Service Mode, carry out the following procedure.
- Connect a test pattern to the antenna terminal.
- Tune the receiver to this signal.
- Turn the receiver off using the mains switch.
- Press volume down and channel up buttons on the front of the receiver at the same time.
- Keeping these buttons pressed, turn the mains on.
- When the set starts up it will be in Service Mode.
- Release the two buttons.
When the Service Mode is entered the following
On Screen Display appears:
SERVICE SOFTWARE version ** . **
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.
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
|
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
|
The following geometry adjustments can be
carried out.
Horizontal
Horizontal Shift
East West Width
Pin Phase
Pin Amp
Vertical angle
Vertical bow
Upper Corner Amplitude
Lower Corner Symmetry
Extreme Corner Symmetry
|
Vertical
Vertical Amplitude
S Correction
Vertical Shift
Vertical Linearity
|
CHANGING NVM DATA
- To change the data contained within the Non Volatile Memory, it is necessary to first select the page the data is stored in, then the position and finally to change the data itself. The procedure below outlines this process.
- While on ALTER NVM PAGE, use the volume up/down buttons to change this data (data is shown in hexadecimal format).
- Press the channel up button and ALTER NVM POSITION appears, use the volume up/down buttons to change this data (data is shown in hexadecimal format).
- Press the channel up button and ALTER NVM VALUE appears, use the volume up/down buttons to change this data (data is shown in hexadecimal format).
- Once this data has been set, press the stand-by button to store.
- If another NVM value has to be changed, use the channel down button to select the page or position and repeat as necessary.
Note: DO NOT change
any NVM data, unless you have been advised to do so by a Sharp representative.
If data is incorrectly changed, serious damage may occur to the receiver.
LED BLINKING CODES
If the TV set does not work and the power
indicator is flashing, follow the sequence according to the information below,
as a guide to fault finding.
- Unable to read or write into NVM: 66% ON, 33% OFF twice and OFF for a second.
- MSP failure: 66% ON, 33% OFF for three times and OFF for a second.
- SDA 9380 failure: 66% ON, 33% OFF for four times and OFF for a second.
- SDA 9402 failure: 66% ON, 33% OFF for five times and OFF for a second.
