13. Dynamic Focus Preset; 14. Lens Focus - Mitsubishi Electric WS-48511 Service Manual

MODELS: WS-48511 / WS-55511 / WS-55711 / WS-65511 / WS-65611 / WS-65711 / WS-65712 / WS-73711 / WS-B55
[Focus Circuit]

13. Dynamic Focus Preset

Measuring
-----
Instrument
Test Point
-----
Ext. Trigger
------
Measuring
-----
Range
Monoscope
Input Signal
Video Input
Input Terminal
CONVERGENCE MODE
Activate ........MENU-2-1-5-9
Misc. ........................."6"
Coarse........................"5"
Fine ..........................."4"
Color (R,G or B)......AUDIO
Item No..................VIDEO
Adjust/Move..........ADJUST
Cursor Toggle.........ENTER
Save & Exit.....MENU (twice)
[Video Circuit]

14. Lens Focus

Measuring
-----
Instrument
Test Point
------
Ext. Trigger ------
Measuring
-----
Range
Monoscope
Input Signal
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 "0 DFH" and "1 DFV" to the data values given in the DF Table.
5. Press "6" to activate CONV-MISC
6. Set "0 FPHS" and "1 DPHS" to data values given in the CONV-MISC Table.
5. Exit the Conv. Mode.
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
DF
(MENU-2-1-5-9-5)
Item Abbr. Data
1 DFH -500
2 DFV -100
CONV MISC
(MENU-2-1-5-9-6)
Item Abbr. Data
9 DPHS 0
10 DOFS 51