16
CONVERGENCE
Adjustment procedure
1. Loosen the fixing screw on the lens cylinder so
that the lens cylinder can be turned. (Be careful
not to loosen too much. If the screw is loos-
ened too much, rattling when tightening becomes
greater and the focus may drift). After completing
steps (5), (6), and (7) below, tighten the fixing
screws for each lens with a torque of 12~17 Kgf
cm.
2. Apply covers to 2 of R, G, and B lenses, and
project a single color on the screen and adjust in
sequence.(The adjustment order of R, G, and B is
only an example.)
3. For each of the R, G, and B lenses, observe the
color aberration generated on the outer circum-
ference of the cross-hatch bright line at the center
section (3 pitches vertically and horizontally from
the center.)
4. If the lens adjustment knob is turned clockwise,
viewed from the front, the color aberration
changes as follows.
Lens
Change of color aberration
R Lens
Red Crimson
G Lens
Blue Red
B Lens
Purple Green
5. In case of G lens, set to the point where the
chromatic aberration switches from blue to red.
If the chromatic aberration appearing all over the
screen is not the same, observe the vertical bright
line at the center of the screen and set to the
position where red chromatic aberration slightly
appears inside and blue outside (reference value:
1~3mm) within the cross-hatch pitches specified
in next table. When the red chromatic aberration
appearing at both sides of the bright line is not
equal, observe the side with larger chromatic
aberration when adjusting.
/
/
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Set Size
Pitch between L1 & L2
50"
3.0 cross-hatch pitches
55"
3.0 cross-hatch pitches
60"
3.0 cross-hatch pitches
6. In case of R lens, set to the position where the
chromatic aberration changes from red to crim-
son. As shown below, observe the vertical bright
line at the center and set to the position where the
crimson chromatic aberration slightly appears
inside and red outside (reference value: 1~3mm)
within the cross-hatch pitches specified in next
table
.
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Set Size
Pitch between L
50"
3.0 cross-hatch pitches
55"
3.0 cross-hatch pitches
60"
3.0 cross-hatch pitches
7. In case of B lens, set to the position where the
chromatic aberration changes from purple to
green. As shown below, observe the vertical
bright line at the center and set to the position
where green chromatic aberration slightly appears
inside and purple outside (reference value:
1~3mm) within the cross-hatch pitches specified
in next table.
