Mitsubishi Electric WS-55807, Service Manual

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Page 43
MODELS: WT-46807 / WS-55807 / WS-55857 / WS-55907 /WS-65807 / WS-65857 / WS-65907 / WS-73907
Purpose:
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
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To converge red, green and blue at the center of the screen
Color edging over the entire picture.
Preliminary
Degauss the shield cover and bracket unit of the CRT assembly and chassis.
DO NOT degauss the centering ring magnets located on the yokes.
HD mode
1. Supply a HD 1080i Monoscope signal to the DTV Inputs.
2. Select the DTV Inputs as the signal source (Input button).
3. Enter the Convergence Coarse mode.
4. Set the data for the “HSTA” and “VTSA” items for red, green and blue to 0.
5. In the Coarse Green mode:
• Center the Green Raster using the Green Centering Magnet.
• Rotate the Green Deflection Yoke to correct any tilt.
6. In the Coarse Red mode, use the Red Centering Magnet to converge
red on the green at the center of screen. Correct any red tilt with the Red
Deflection Yoke.
7. In the Coarse Blue mode, repeat Step 6 using the Blue Centering magnet and
the Blue Deflection Yoke.
8. Exit the Convergence mode.
SD mode
1. Supply an NTSC Monoscope signal to a Video Input.
2. Select the Monoscope as the signal source (Input button).
3. Enter the Convergence Coarse mode.
4. In the Coarse Green mode, use Items “0 HSTA” and “4 VSTA” to center the
green raster.
5. In the Coarse Red mode, use Items “0 HSTA” and “5 VSTA” to converge red
on the green at the center of the screen.
6. In the Coarse Blue mode, repeat step 5 to converge the blue on the green.
7. Exit the Convergence mode.
[Convergence Circuit]
21. Centering and Static
Convergence
NTSC -- Monoscope
HD -- 1080i Monoscope
Video & DTV Inputs
CONVERGENCE MODE
Activate ……..MENU-8-2-5-9
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)