DOWNLOAD Sharp 28JF-73H (serv.man5) Service Manual ↓ Size: 204.69 KB | Pages: 6 in PDF or view online for FREE

In the event off a Colorimeter not being available, please follow the following procedures to obtain correct and Grey
scale settings (R-G-B Cut Off and Gain).

1. In the user menu, set the picture levels to the FACTORY settings (normalised).
2. Enter the Service Mode.
3. Adjust the G2 as in the previous page procedure.
4. Set the 50, 51, 52, 53, 54 and 55 NVM positions on page 00  from the original value to 80. Store each location by

pressing the stand-by button on the remote control.

5. Adjust grey scale as follows.

5.1 Select a grey scale signal, then set the Red Cut-off level to 32 and the Red-Gain to 50.
5.2 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 neces-
sary to readjust the settings to achieve good tracking.

Note: The data to be adjusted is contained at the bottom right corner of the picture. See

Figure 15.

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.

1. Press the channel up/down buttons and ALTER NVM PAG appears, use the volume up/down buttons to change this

data (it is shown in hexadecimal format).

2. Press the channel up button and ALTER NVM POS appears, use the volume up/down buttons to change this data (it is

shown in hexadecimal format).

3. Press the channel up button and ALTER NVM VAL appears, use the volume up/down buttons to change this data (it is

shown in hexadecimal format).

4. Once this data has been set, press the stand-by button to store.
5. 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.

In order to deactivate the Postcode when the Password is not on mind, change the below detailed NVM values.

Three types of contrast levels can be varied as listed below:
• TELETEXT MIX MODE CONTRAST

• TELETEXT CONTRAST

• OSD CONTRAST

Use the volume up/down buttons to adjust to a suitable level, then. It is not necessary to press the stand-by button to store,
data are memorized by exiting the Service Mode.

  NVM Page            NVM Position       New NVM Value

08

3C

00

08

3F

00

DVCO Adjustment (PAL)
Carry out the DVCO Adjustment (PAL) as shown below:
1. Receive a Philips pattern signal.
2. While in the DVCO ADJUSTMENT (PAL) menu, press the stand-by button.
3. The adjustment will be carried out automatically and stored.

DVCO Adjustment (NTSC)
No adjustment required.

AGC Adjustment
To correctly align the Automatic Gain Control, follow the procedure outlined below:
1. Tune the set into a pattern generator on CH12.
2. Adjust the signal strength of the pattern generator to 59dB/

µV (75Ω).

Rotation Inspection
No adjustment required. Just to check the proper working of this user feature. It cannot be memorized and after reset the
TV, the picture will appear normalized as other features.

Auto Installation On/Off
To return the receiver to the original Auto Installation mode, using the volume up or down button, set the Auto Installation
On/Off to On. This setting is automatically stored and when the receiver is turned on the next time it will start up in Auto
Installation mode.

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.

1. Unable to read or write into NVM: 66% ON, 33% OFF twice and OFF for a second.

2. MSP failure:  66% ON, 33% OFF for three times and OFF for a second.

3. VCT failure: 66% ON, 33% OFF for four times and OFF for a second.

On        Off

On        Off

On        Off

DVCO Adjustment (PAL)
Carry out the DVCO Adjustment (PAL) as shown below:
1. Receive a Philips pattern signal.
2. While in the DVCO ADJUSTMENT (PAL) menu, press the stand-by button.
3. The adjustment will be carried out automatically and stored.

DVCO Adjustment (NTSC)
No adjustment required.

AGC Adjustment
To correctly align the Automatic Gain Control, follow the procedure outlined below:
1. Tune the set into a pattern generator on CH12.
2. Adjust the signal strength of the pattern generator to 59dB/

µV (75Ω).

Rotation Inspection
No adjustment required. Just to check the proper working of this user feature. It cannot be memorized and after reset the
TV, the picture will appear normalized as other features.

Auto Installation On/Off
To return the receiver to the original Auto Installation mode, using the volume up or down button, set the Auto Installation
On/Off to On. This setting is automatically stored and when the receiver is turned on the next time it will start up in Auto
Installation mode.

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.

1. Unable to read or write into NVM: 66% ON, 33% OFF twice and OFF for a second.

2. MSP failure:  66% ON, 33% OFF for three times and OFF for a second.

3. VCT failure: 66% ON, 33% OFF for four times and OFF for a second.

On        Off

On        Off

On        Off

DVCO Adjustment (PAL)
Carry out the DVCO Adjustment (PAL) as shown below:
1. Receive a Philips pattern signal.
2. While in the DVCO ADJUSTMENT (PAL) menu, press the stand-by button.
3. The adjustment will be carried out automatically and stored.

DVCO Adjustment (NTSC)
No adjustment required.

AGC Adjustment
To correctly align the Automatic Gain Control, follow the procedure outlined below:
1. Tune the set into a pattern generator on CH12.
2. Adjust the signal strength of the pattern generator to 59dB/

µV (75Ω).

Rotation Inspection
No adjustment required. Just to check the proper working of this user feature. It cannot be memorized and after reset the
TV, the picture will appear normalized as other features.

Auto Installation On/Off
To return the receiver to the original Auto Installation mode, using the volume up or down button, set the Auto Installation
On/Off to On. This setting is automatically stored and when the receiver is turned on the next time it will start up in Auto
Installation mode.

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.

1. Unable to read or write into NVM: 66% ON, 33% OFF twice and OFF for a second.

2. MSP failure:  66% ON, 33% OFF for three times and OFF for a second.

3. VCT failure: 66% ON, 33% OFF for four times and OFF for a second.

On        Off

On        Off

On        Off