32JF-74H (serv.man8). Service Mode and Adjustment Procedrues - Sharp TV Service Manual (repair manual)

32jf-74h (serv.man8) service manual
Model
32JF-74H (serv.man8)
Pages
6
Size
204.47 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR / Service Mode and Adjustment Procedrues
File
32jf-74h-sm8.pdf
Date

Read Sharp 32JF-74H (serv.man8) Service Manual online

7
32JF-74H
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.
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
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 “
∗∗−∗∗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.
The following geometry adjustments can be carried out. Detailed instructions on how to execute these are given on the
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
32JF-74H
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.
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.
• 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.
• 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.
• 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.
• 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.
• 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
 
9
32JF-74H
Corner Symmetry
Adjust the Corner Symmetry so that the picture is centred.
The effect of this adjustment is shown in figure 7.
Note: This adjustment affects to upper and lower sides.
• When the volume up button is pressed, side pincushion changes from barrel shape to
pincushion.
• When the volume down button is pressed, side pincushion changes from pincushion to
barrel shape.
• Press the stand-by button on the remote control to store.
Vertical Linearity
Adjust the Vertical Linearity so that the upper and lower parts of the picture are symmetrical.
The effect of this adjustment is shown in figure 8.
• When the volume up button is pressed, the upper picture scanning decreases and the
lower picture scanning increases.
• When the volume down button is pressed, the upper picture scanning increases and the
lower picture scanning decreases.
• Press the stand-by button on the remote control to store.
Vertical Angle
Adjust the Vertical Angle so that the picture is centred.
The effect of this adjustment is shown in figure 9.
• When the volume up button is pressed, the vertical angle changes to right.
• When the volume down button is pressed, the vertical angle changes to left.
• Press the stand-by button on the remote control to store.
Vertical Bow
Adjust the Vertical Bow so that the picture is centred.
The effect of this adjustment is shown in figure 10.
• When the volume up button is pressed, the vertical bow changes to right.
• When the volume down button is pressed, the vertical bow changes to left.
• Press the stand-by button on the remote control to store.
Vertical Amplitude
Adjust the Vertical Amplitude so that 8% over-scan is achieved.
The effect of this adjustment is shown in figure 11.
• When the volume up button is pressed, the vertical size of the picture increases.
• When the volume down button is pressed, the vertical size of the picture decreases.
• Press the stand-by button on the remote control to store.
S Correction
Adjust the S Correction so that the picture symmetrical between the top, centre and bottom.
The effect of this adjustment is shown in figure 12.
• When the volume up button is pressed, the top and bottom scanning increases and the
centre scanning decreases.
• When the volume down button is pressed the top and bottom scanning decreases and
the centre scanning increases.
• Press the stand-by button on the remote control to store.
Figure 8
Figure 12
Figure 11
Figure 10
Figure 9
Figure 7
10
32JF-74H
Colour Adjustments
The following adjustments should only be carried out when the CRT or IC850 are replaced.
G2 (screen), R-G-B Cut Off and Gain Adjustments
1. Follow the procedure below to set the G2
1.1 Tune the set to the output of a signal generator (monoscope pattern).
1.2 In the user menu, set contrast to 80/100 and brightness to 40/100 (TV normalized).
1.3 Select FULL MODE.
1.4 Enter the Service Mode.
1.5 Select RED GAIN in Service Mode.
1.6 Adjust SCREEN VR so that the OSD value (indicated on Figure 14) reaches 50h ± 8h.
2. Follow the procedure below to set the Cut Off.
2.1 Adjust G2.
2.2 Tune a white pattern.
2.3 Adjust colour to minimum.
2.4 Position colorimeter in the centre of screen.
2.5 Adjust brightness and contrast to obtain a luminance of 
≈ 3 NITS.
2.6 Operate in Service Mode and select location RED CUT OFF, GREEN CUT OFF and  BLUE CUT OFF, to obtain
colour coordinates:
 X=0.290 ± 0.015       Y=0.284 ± 0.015
To increase press volume-up button and to decrease press volume down button.
RED CUT OFF
 alter «X» coordinate.
GREEN CUT OFF  alter «Y» coordinate.
BLUE CUT OFF
 alter «X» and «Y» coordinate.
3. Follow the procedure below to set the GAIN.
3.1 Using brightness and contrast buttons, select a luminance of 
≈100 NITS.
3.2 Operate in Service Mode and select location RED GAIN, GREEN GAIN and  BLUE GAIN, to obtain colour
coordinates:
X=0.290 ± 0.015       Y=0.284 ± 0.015
To increase press volume-up button and to decrease press volume down button.
RED GAIN alter «X» coordinate.
GREEN GAIN alter «Y» coordinate.
BLUE GAIN alter «X» and «Y» coordinate.
3.3 Exit Service Mode and check colour coordinates «X» and «Y» at 3 and 100 NITS. It may be necessary to repeat
procedure 2 and 3 of Colour Adjustments.
Vertical Shift
Adjust the Vertical Shift so that the picture is centred.
The effect of this adjustment is shown in figure 13.
• When the volume up button is pressed, the picture moves down.
• When the volume down button is pressed, the picture moves up.
• Press the stand-by button on the remote control to store.
Figure 13
Figure 14
   RED GAIN                     XX
XX  XX  XX  XX
XX   50  XX  XX
Adjust value
to 50h ± 8h
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