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

Just in case the TV set requires a full geometry adjustment, please proceed first with Vertical according to the above order, and after that, adjust Horizontal according to the above order.

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.