Centering & Static Convergence - Mitsubishi WS-48515 Service Manual

MODELS: WS-48515 / WS-55515 / WS-55615 / WS-55815 / WS-65515 / WS-65615 /WS-65815 / WS-73615
[Convergence Circuit]
16. Centering and Static
Convergence
Measuring
-----
Instrument
Test Point
-----
------
Ext. Trigger
Measuring
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Range
NTSC -- Monoscope
Input Signal
HD -- Monoscope
Input Terminal
Video & Component Inputs
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)
Purpose:
To converge red, green and blue at the center of the screen
Symptom:
Color edging over the entire picture.
Preliminary
Degauss the shield cover and bracket unit of the CRT assembly and chassis.
DO NOT degauss the CPM Assemblies.
CAUTION: Do Not adjust the Alignment Magnets instead of the Centering Magnets.
NOTE: Confirm that Item #13 HPOS, in the CRT-JNGL function of the MENU-2-4-5-7
Adjustment mode is set to the following values:
HD=34
SD=23
HD mode (The following steps must be performed in the HD mode)
1. Supply an HD Monoscope signal to the Component Input.
2. Select the Component Input as the signal source (Input button).
3. Enter the Convergence Coarse mode.
4. Set the data for the "HSTA" and "VSTA" items to:
GREEN RED
HSTS = 0 HSTA = 50
VSTA = 0 VSTA = 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 Green mode.
4. Confirm that the Green Raster is centered.
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BLUE
HSTA = -50
VSTA = 0