Sharp 28JF-76E Service Manual page 10

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.
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.
10
Figure 12
Figure 13
Figure 14
Figure 15
150 V
CH1 gnd
Figure 16