Sharp 28JF-73H (serv.man21) Service Manual ▷ View online
5
28JF-73H
■ FRONT TV
1.
Main power button
2.
Power indicator
3.
Remote control sensor
4.
Volume DOWN button
5.
Volume UP button
6.
Channel DOWN button
7.
Channel UP button
HOW TO OPEN THE DOOR
Lift the projection at the lower right of the door with
your finger in the direction of the arrow.
your finger in the direction of the arrow.
Behind the door
1.
S-VIDEO input terminal
2.
VIDEO input terminal (PAL/SECAM/NTSC)
3.
AUDIO input terminal (left)
4.
AUDIO input terminal (right)
5.
Headphone jack (3.5mm / 16~600 ohms)
■ REAR TV
21-pin In/Out
1.
21-pin Audio/Video (AV-2)
With PAL/SECAM/NTSC Video Input
With PAL/SECAM/NTSC Video Input
2.
21-pin Audio/Video (AV-1)
With PAL/SECAM/NTSC/S-Video Input
With PAL/SECAM/NTSC/S-Video Input
3.
21-pin Euro SCART (RGB)
With PAL/SECAM/NTSC Video Input
With PAL/SECAM/NTSC Video Input
RF Input
4.
Aerial terminal
1
2
3
4 5 6 7
4
2
3
1
1
2
3
4
5
CONTROLS & TERMINALS
6
28JF-73H
REMOTE CONTROL
TV
1. Stand-by button (TV)
Video
2. Power button (VCR)
TV
3. 0 ~ 9 digit buttons
4. Flash back button
4. Flash back button
Teletext
5. GREEN button
6. RED button
6. RED button
TV
7. Volume DOWN button
8. MENU button
8. MENU button
Teletext
9. REVEAL button
10. LIST button
11. STORE button
12. CANCEL button
13. HALF PAGE button
11. STORE button
12. CANCEL button
13. HALF PAGE button
TV
14. RESET button
Video
15. Rewind/picture search reverse
16. Play button
17. Pause/Still button
18. Stop button
16. Play button
17. Pause/Still button
18. Stop button
TV
19. TV/VIDEO button
20. Channel Call button
21. Single/Double entry button
20. Channel Call button
21. Single/Double entry button
Teletext
22. YELLOW button
23. BLUE button
23. BLUE button
TV
24. Channel UP button
25. Volume UP button
26. Channel DOWN button
27. Wide mode button
25. Volume UP button
26. Channel DOWN button
27. Wide mode button
TV /Teletext
28. CLOCK button
TV
29. Sound mode button
Teletext
30. HOLD button
TV
31. Sound Mute button
Teletext
32. TEXT/MIX/PICTURE button
33. INDEX button
33. INDEX button
Video
34. Channel UP button (VCR)
35. Fast forward/picture search forward
36. Channel DOWN button (VCR)
37. Record button
35. Fast forward/picture search forward
36. Channel DOWN button (VCR)
37. Record button
1.
19.
23.
21.
24.
25.
26.
27.
28.
29.
30.
31.
32.
34.
37.
36.
35.
33.
22.
20.
4.
5.
6.
7.
8.
10.
11.
11.
12.
13.
15.
18.
17.
16.
14.
9.
2.
3.
7
28JF-73H
ADJUSTMENT PROCEDURES
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.
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.
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
SERVICE SOFTWARE
∗∗−∗∗x∗∗
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 figure displayed in the “
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 figure displayed in the “
∗∗−∗∗x∗∗ ” location is the EPROM version.
X
Adjustment menu:
The following adjustments can be carried out in the Service Mode.
• Horizontal Shift
• East West Width
• Pin Phase
• Pin Amp (Amplitude)
• Corner Amplitude
• Corner Symmetry
• Vertical Linearity
• Vertical Angle
• Vertical Bow
• Vertical Amplitude
• S Correction
• Vertical Shift
• Red Gain
• Green Gain
• Blue Gain
Note that the receiver should be set to FULL MODE before carrying out any geometry adjustments. This can be achieved
by pressing the widescreen mode button on the remote control until FULL MODE appears on the OSD. This can only be
done out of the Service Mode.
by pressing the widescreen mode button on the remote control until FULL MODE appears on the OSD. This can only be
done out of the Service Mode.
The following geometry adjustments can be carried out. Detailed instructions on how to execute these are given on the
following pages.
following pages.
• 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
• Rotation Inspection
• Auto Installation On/Off
Figure 1
4
5
8
28JF-73H
Horizontal
• Horizontal Shift
• E-W Width
• Pin Phase
• Pin Amp
• Corner Amplitude
• Corner Symmetry
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.
order, and after that, adjust Horizontal according to the above order.
Vertical
• Vertical Amplitude
• Vertical Shift
• Vertical Bow
• Vertical Angle
• S Correction
• Vertical Linearity
Horizontal Shift
Adjust the Horizontal Shift so that the picture is centred.
The effect of this adjustment is shown in figure 2.
Adjust the Horizontal Shift so that the picture is centred.
The effect of this adjustment is shown in figure 2.
• When the volume up button is pressed, the picture moves to the right.
• When the volume down button is pressed, the picture moves to the left.
• Press the stand-by button on the remote control to store.
E-W Width
Adjust the E-W Width so that 8% over-scan is achieved.
The effect of this adjustment is shown in figure 3.
Adjust the E-W Width so that 8% over-scan is achieved.
The effect of this adjustment is shown in figure 3.
• When the volume up button is pressed, horizontal scanning decreases.
• When the volume down button is pressed, horizontal scanning increases.
• Press the stand-by button on the remote control to store.
Pin Phase
Adjust the Pin Phase so that the picture is symmetrical top and bottom.
The effect of this adjustment is shown in figure 4.
Adjust the Pin Phase so that the picture is symmetrical top and bottom.
The effect of this adjustment is shown in figure 4.
• When the volume up button is pressed, side pincushion changes.
• When the volume down button is pressed, side pincushion changes.
• Press the stand-by button on the remote control to store.
Pin Amp
Adjust the Pin Amp so that the picture is centred.
The effect of this adjustment is shown in figure 5.
Adjust the Pin Amp so that the picture is centred.
The effect of this adjustment is shown in figure 5.
• When the volume up button is pressed, side pincushion changes from pincushion to
barrel shape.
• When the volume down button is pressed, side pincushion changes from barrel
shape to pincushion.
• Press the stand-by button on the remote control to store.
Corner Amplitude
Adjust the Corner Amplitude so that the picture is centred.
The effect of this adjustment is shown in figure 6.
Note: This adjustment affects to upper and lower sides.
Adjust the Corner Amplitude so that the picture is centred.
The effect of this adjustment is shown in figure 6.
Note: This adjustment affects to upper and lower sides.
• When the volume up button is pressed, side pincushion changes from pincushion to
barrel shape.
• When the volume down button is pressed, side pincushion changes from barrel
shape to pincushion.
• Press the stand-by button on the remote control to store.
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
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