SHARP 28JF76E
Manual de Servicio

28JF-76E
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 14 Figure 13 Figure 12

Figure 15

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.
150 V

CH1 gnd

Note: Oscilloscope should be adjusted for vertical TV field trigger and synchronized with video signal.

Figure 16

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