32JF-77 (serv.man5). Adjustment procedures — Sharp TV Service Manual (repair manual)

Model
32JF-77 (serv.man5)
Pages
7
Size
258.08 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR / Adjustment procedures
File
32jf-77-sm5.pdf
Date

View Sharp 32JF-77 (serv.man5) Service Manual online

7
32JF-77H
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 the value of 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, then the following
    On Screen Display appears:
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(1) or Store button(11) on the remote control.
••••• To exit the Service Mode, turn the receiver off using the Main switch.
Note: In this Service Mode, by using the colour buttons of Remote Control is possible to pass directly to the adjustments
         that are indicated 
inside of 
each coloured box (see Figure 2), as follows.
Press the RED button to access to Geometry adjustments.
Press the GREEN button to access to NVM adjustments.
Press the YELLOW button to access to Automatic Gain Control adjustments.
Press the  BLUE button to access to CUT OFF adjustments.
Adjustment menu:
The following adjustments can be carried out in the Service Mode.
Figure 1
4
5
Figure 2
• Horizontal shift
• Horizontal size
• Pin phase
• Pin amplitude
• Upper corner correction
• Lower corner correction
• Extreme corner correction
• Vertical linearity
• Vertical angle
• Vertical bow
• Vertical size
• Vertical S-correction
• Vertical shift
• Cut RED
• Cut GREEN
• Cut BLUE
• Hot Cut RED
• Hot Cut GREEN
• Hot Cut BLUE
• Cold Cut RED
• Cold Cut GREEN
• Cold Cut BLUE
• Automatic Gain Control
• Subcarrier adjustment (ONLY PAL)
• NVM PAGE
• NVM POSITION
• NVM VALUE
RED
GREEN
YELLOW
BLUE
8
32JF-77H
The following geometry adjustments can be carried out.  Detailed instructions on how to execute these are given on the
following pages:
 Horizontal
• Horizontal shift
• Horizontal size
• Pin phase
• Pin amplitude
• Vertical angle
• Vertical bow
• Upper corner correction
• Lower corner correction
• Extreme corner correction
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.
Geometry Adjustments
Horizontal Shift
Adjust the Horizontal shift so that the picture is centred.
The effect of this adjustment is shown in figure 3.
• When the volume up button is pressed, the picture moves to the left.
• When the volume down button is pressed, the picture moves to the right.
• Press the stand-by button on the remote control to store.
Horizontal size
Adjust the Horizontal size so that 8% over-scan is achieved.
The effect of this adjustment is shown in figure 4.
• When the volume up button is pressed, horizontal scanning increases.
• When the volume down button is pressed, horizontal scanning decreases.
• 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 5.
• 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 amplitude
Adjust the Pin amplitude so that the picture is centred.
The effect of this adjustment is shown in figure 6.
• When the volume up button is pressed, side pincushion changes
   from pincushion to barrel shape.
Figure 3
Figure 4
Figure 5
Figure 6
Vertical
• Vertical size
• Vertical S-correction
• Vertical shift
• Vertical linearity
9
32JF-77H
• 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.
Upper corner correction
Adjust the Upper Corner Correction so that the picture is centred.
The effect of this adjustment is shown in figure 7.
• 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.
Lower corner correction
Adjust the Lower corner correction so that the picture is centred.
The effect of this adjustment is shown in figure 8.
• 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.
Extreme corner correction
Adjust the Extreme corner correction so that the picture is centred.
The effect of this adjustment is shown in figure 9.
• 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.
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 10.
• 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 11.
• 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.
Figure 10
Figure 8
Figure 11
Figure 7
Figure 9
10
32JF-77H
G2 Adjustment
Follow the procedure below to set the G2:
1. Tune the set to the output of a signal generator (Cross-Hatch pattern).
2. In the user menu, set contrast to 80/100 and brightness to 40/100.
3. Connect the oscilloscope to the RED catode of cathode tube (pin 8 of CRT
    socket) and adjust G2 to read 150V on the sensor pulse as in figure 16.
Note:
Oscilloscope should be adjusted for vertical TV field trigger and synchronized with video signal.
Vertical bow
Adjust the Vertical bow so that the picture is centred.
The effect of this adjustment is shown in figure 12.
• When the volume up button is pressed, the vertical bow changes to left.
• When the volume down button is pressed, the vertical bow changes to right.
• Press the stand-by button on the remote control to store.
Vertical size
Adjust the Vertical size so that 8% over-scan is achieved.
The effect of this adjustment is shown in figure 13.
• 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.
Vertical S-correction
Adjust the Vertical S-correction so that the picture symmetrical between the top, centre and
bottom. The effect of this adjustment is shown in figure 14.
• When the volume up button is pressed, the top and bottom scanning decreases and the
centre scanning increases.
• When the volume down button is pressed the top and bottom scanning increases and the
centre scanning decreases.
• Press the stand-by button on the remote control to store.
Vertical Shift
Adjust the Vertical Shift so that the picture is centred.
The effect of this adjustment is shown in figure 15.
• When the volume up button is pressed, the picture moves up.
• When the volume down button is pressed, the picture moves down.
• Press the stand-by button on the remote control to store.
Figure 15
Figure 12
Figure 13
Figure 14
  150 V
CH1 gnd
Figure 16
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Here you can view online or download Sharp 32JF-77 (serv.man5) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp 32JF-77 (serv.man5) CTR. Information contained in Sharp 32JF-77 (serv.man5) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).