Dynamic Focus Presets & Lens Focus - Mitsubishi WS-55517 Service Manual

MODELS: WS-55517 / WS-65517 / WS-73517
[Focus Circuit]
9. Dynamic Focus Preset
Measuring
-----
Instrument
Test Point
-----
Ext. Trigger
------
Measuring
-----
Range
Input Signal
Monoscope
Input Terminal
Video Input
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
Input Terminal
Video Input
Purpose:
To improve edge focus.
Symptom:
Poor focus at the edges of the screen.
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
Item Abbr
1 DFH
2 DFV
Purpose
To set the Lens position for optimum focus.
Symptom:
Poor focus
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 31
MENU-2-4-5-6-5
Function
Dynamic Focus Horiz.
Dynamic Focus Vert..
Data
-450
200