Text preview for : Focus_Adjustments.pdf part of Mitsubishi VS-50805, WT-60805, WS-55905, WS-65905, WS-73905, WS-55805, WT-46805 Mitsubishi VS-50805, WT-60805, WS-55905, WS-65905, WS-73905, WS-55805, WT-46805 (Chassis V16 N W) (Training Manual + Schematic)



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MODELS: VS-50805 / VS-60805 / WT-46805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
[Focus Circuit] 15. Dynamic Focus Preset
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal -----------------Monoscope Video Input

Purpose: Symptom:
1. 2. 3. 3. 4. 5.

To improve edge focus. Poor focus at the edges of the screen.

Supply a Monoscope signal to a Video Input Activate the Convergence Mode, Conv. Misc Function. Set Items 4 FPHS and 6 DPHS to the data values given in Table 1. Select the DF Function under the Conv. Coarse Mode. Set Items 0 DFH and 1 DFV to the data value given in Table 2. Exit the Conv. Mode.

CONVERGENCE MODE Acivate ..MENU-1-2-5-9 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)

CONV-MISC. Item # Abbrev V16N Data V16W Data 4 FPHS 186 178 6 DPHS 250 245 Table 1 DF Function Item # Abbrev V16N Data VA6W Data 0 DFH 175 200 1 DFV 50 40 Table 2

[CRT Circuit] 16. Electrostatic Focus
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal ------------------Monscope Video Input

Purpose Symptom:

To set electrostatic focus to the optimum point. Poor focus.

Note: This adjustment must be performed after the Sub Contrast adjustment. 1. 2. 3. 3. Supply a Monoscope signal to a Video Input Activate A/V Reset Select Red, Green or Blue rasters using the table below. Set the Red, Green and Blue Focus VRs for optimum focus at the top center of the picture..

Raster Color Selection Color Raster Activation Code Red MENU-1-2-5-9-1 Green MENU-1-2-5-9-2 Blue MENU-1-2-5-9-3

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MODELS: VS-50805 / VS-60805 / WT-46805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
[Video Circuit] 17. Lens Focus
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal ------------------Monoscope Video Input

Purpose:

To set the Lens position for optimum focus.

Symptom: Poor focus

Note: This adjustment must follow item 6 (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.

[On Screen Display] 18.Character Position
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal ------------------Video Signal Video Input

Purpose

To position the character display horizontally.

Symptom: Incorrect display position

1. 2. 3. 3.

Supply a video signal to a Video Input Enter the Service Mode HR function. Adjust so the width of (A) and (B) are equal as shown below. Save data and exit the Service Mode.

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

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