2.FINAL ASSEMBLY ADJUSTMENT

2.1Focus adjustment

Adiustment preparation

(1)The set can face in any direction: west, east, north or south.

(2)Receive the cross-hatch pattern signal.

CONTRAST : HALF

BRIGHTNESS : MINIMUM

(3)The electrical focus adjustment should have been completed.

(4)The centering DY inclination should have been adjusted.

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 it is loosened 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 abberation generated on the outer circumference 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.

(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: l -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.

RED

CHROMATIC

ABERRATION

SLIGHTLY BLUE CH6OMATlC ABERRATION

OR NO COLOR

Set Size

Pitch between

Ll & L2

50” 3.0 cross-hatch pitches

60” 3.0 cross-hatch pitches

63)In case of R lens, set to the position where the chromatic aberration changes from red to crimson. 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.

RED

CHROMATIC

ABERRATION

SLIGHTLY CRIMSON

CHROMATIC ABERRATION

{I

(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: l-3mm) within the cross-hatch pitches specified in next table.

PURPLE CHROMATIC

SLIGHTLY GREEN

ABERRATION

CHROMATIC ABERRATION

ISet Size

I

 

Pitch between

L

I

50”

 

3.0

cross-hatch

pitches

 

60”

 

3.0

cross-hatch

pitches

 

25

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Hitachi 60SBX78B, 50SBX78B service manual Final Assembly Adjustment, Contrast Half Brightness Minimum

60SBX78B, 50SBX78B specifications

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