Zenith IQC50H94 Technical Training Manual - Convergence
24
CONVERGENCE
4. Note the center of the video pattern displayed.
This is necessary to match dotted lines (adjust-
ment point viewed) and actual point that is
adjusted and displayed by the video signal.
5. Press the service only switch (on POWER/
DEFLECTION PWB). The pattern displayed is
now the digital convergence mode.
6. When performing a complete digital convergence
adjustment CLEAR DATA in RAM. See 2.6 (1)-
(7).
7. To clear data turn TV set off. Press and hold the
service switch and then press POWER on.
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NOTE: If only minor adjustments to conver-
gence are needed, the jig screen is not neces-
sary. Use digital data stored in memory and
one color as a reference(red,green or blue).
DO NOT CLEAR DATA and WRITE to
ROM memory.
Advanced convergence Adjustment Procedure
WARNING: Advanced Convergence Adjustment
Procedure is to be performed only when
replacement of the Small Signal Main
Module or one or more the the CRTs is
replaced.
RASTER CENTERING
1. Press the service button SKO1 to enter the
Convergence setup mode.
2. Press the FREEZE button to enter the Raster
Phase Adjustment Mode. Two additional lines
appear, one near the top, and one near the bottom
of the screen.
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Press the MENU button to see all colors if the
center cross is other than White.
3. Press the Cursor Keys to match the selected color
to the green at the geometric center of the screen.
4. Press the RECALL, 0, or SOURCE buttons to
select the next color to be adjusted.
0= Red / Green (Yellow)
SOURCE= Green / Blue (Cyan)
DISPLAY= Green Only
5. Press Freeze button to exit the Raster Phase Mode.
(The two lines disappear)
6. Press SKO1 to exit Convergence Service Mode.
CONVERGENCE 3X3
Green 3x3 Mode Alignment
1. Start with power off, press the service button SKO1
and hold, then press the front panel POWER button
at the same time. Set should come on with mis-
aligned convergence.
Note: Mis-aligned convergence will appear, DO
NOT ACTIVATE ROM WRITE (MOVE
button twice). If you do so, you will save this
un-adjusted convergence data.
2. Press DISPLAY button 5 times to access 3x3
Mode.
3. Press the MENU key to project the RED +
GREEN cross- hatch colors only. Then press
DISPLAY to project the GREEN only.
4. Use the 2,4,5, and 6 keys(up, left, down, and right,
respectively)to select the adjustment point. Start
at center adjustment point, then move to top and
bottom, then left and right, and finally the corners.