Nokia 920C Service Manual page 11

4 Alignment and Adjustments
4-2-2 (b) VERTICAL LINEARITY ADJUSTMENT
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
To adjust the Vertical Linearity, refer to Tables 4-1
and 4-2 for the tolerance range.
Click on the << or >> box next to V_LIN to
optimize the image.
4-2-3 Trapezoid Adjustment
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
Click on the << or >> box next to TRAP to make
the image area rectangular.
| A - B | < 5 mm
A
B
Figure 4-4. Trapezoid
4-2-4 Pinbalance Adjustment
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
| D1 |, | D2 | ≤ 2.0 mm
D1
Figure 4-5. Pinbalance
Click on the << or >> box next to PIN_BAL to
optimize the image.
4-2-5 Parallelogram Adjustment
CONDITIONS
Scanning Frequency:
Display image:
Brightness:
Contrast:
Click on the << or >> box next to PARALLEL to
make the image area rectangular.
4-4
91 kHz/85 Hz
Crosshatch pattern
Cut-off
Maximum
91 kHz/85 Hz
Crosshatch pattern
Cut-off
Maximum
A
B
91 kHz/85 Hz
Crosshatch pattern
Cut-off
Maximum
D2
91 kHz/85 Hz
Crosshatch pattern
Cut-off
Maximum
4-2-6 Side Pincushion Adjustment
CONDITIONS
Scanning frequency:
Display image:
Brightness:
Contrast:
Click on the << or >> box next to BARREL to
straighten the sides of the image area.
| C1 |, | C2 | ≤ 2.0 mm, | D1 |, | D2 | ≤ 2.0 mm.
D1
4-2-7 Tilt Adjustment
CONDITIONS
Scanning Frequency:
Display image:
Brightness:
Contrast:
Click on the << or >> box next to ROTATE to
D1
correct the tilt of the display.
4-2-8 Degauss
No adjustments are available for the degaussing
circuit. The degaussing circuit can effectively
function only once per 30 minutes.
4-2-9 To Delete the User Mode Data
To delete the adjustment data from the user
modes, press the EXIT Button for 15 seconds.
4-2-10 Save the Data
To save the adjustment data for a mode, press
FACTORY SAVE.
5 mm
Figure 4-6. Parallelogram
91 kHz/85 Hz
Crosshatch pattern
Cut-off
Maximum
C2
C1
Figure 4-7. Pincushion
91 kHz/85 Hz
Crosshatch pattern
Cut-off
Maximum
D2
720C/920C