Dynamic Focus Presets & Lens Focus - Mitsubishi WS-48515 Service Manual

MODELS: WS-48515 / WS-55515 / WS-55615 / WS-55815 / WS-65515 / WS-65615 /WS-65815 / WS-73615
[Focus Circuit]
9. Dynamic Focus Preset
Measuring
-----
Instrument
Test Point -----
------
Ext. Trigger
Measuring
-----
Range
Monoscope
Input Signal
Video Input
Input Terminal
CONVERGENCE MODE
Activate ... .....MEN U-2-4-5-9
Mis c. ......... ......... .... ..."6"
C oars e... ......... ............"5"
Fine ......... ............ ......"4"
C olor (R ,G or B)...... AUD IO
Item No...... ............VIDEO
Adjus t/Move...... ....ADJUST
C urs or Toggle.........EN TER
Save & Exit.....MEN U (tw ice)
[Video Circuit]
10. Lens Focus
Measuring
-----
Instrument
------
Test Point
------
Ext. Trigger
-----
Measuring
Range
Input Signal Monoscope
Video Input
Input Terminal
Purpose: To improve edge focus.
Poor focus at the edges of the screen.
Symptom:
1. Supply a Monoscope signal to a Video Input
2. Activate the Convergence Mode.
3. Select the DF Function under the Conv. Coarse Mode.
4. Set Items "1 DFH" and "2 DFV" to the data values given in the DF Table.
5. Exit the Conv. Mode.
DF
(MENU-2-4-5-9-5)
Item Abbr. Function
1 DFH Dynamic Focus Horizontal
2 DFV Dynamic Focus Vertical
Purpose
To set the Lens position for optimum focus.
Poor focus
Symptom:
Note: This adjustment must be done before Electrostatic Focus. Perform this
adjustment for RED, GREEN, and BLUE monochrome pictures.
1. Supply a VIDEO signal (Monoscope).
2. Cover the Red and Blue Lens (producing a green raster).
3. Adjust the Green Lens for best focus at the center of the Monoscope pattern.
Note: Attach a white paper to the
screen center. During adjustment,
observe the picture on the screen
from inside for easier adjustment.
4. Repeat Steps 2 and 3 for the Red
and Blue monochrome pictures.
Page 44
Data
WS-48515 WS-55615 WS-55815 WS-65515 WS-
WS-55515 65615 WS-65815 WS-73615
-375 -450
200 200