Display Alignment; Time & Display Size; Picture Position; Linearity - Hitachi CM715ET Service Manual

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1. DISPLAY ALIGNMENT

A. Times & Display Size
For all presetting mode listing in section 2.4 shall be within the limitation:
H. WIDTH
V. HEIGHT
The external control range of the data area, shall be as follows;
Max. horizontal size
Min. horizontal size
Max. vertical size
Min. vertical size
B. Picture Position
For all presetting mode listing in section 2.4 shall be within the limitation:
H.PHASE
V.CENTER
The external control ranges of display for all modes listed in section 2.4
H.POSITION
V.CENTER
C. Linearity
The CONTRAST and BRIGHTNESS control shall be properly adjusted at 20 F-L with Full-intensity reverse
pattern, then change to crosshatch Pattern 12x10 (Hx V), the size of grid of crosshatch pattern in every display
mode shall not vary than 10%.If two line is next to each other, 5% if they are not next to each other. The calculation
formula was listed below:
H max - H min
(H max + H min) / 2
306 ± 4 mm
230 ± 4 mm
: overscan the screen
: ≤ 285mm
: over the screen
: ≤ 202 mm
SCREEN CENTER ± 3 mm
SCREEN CENTER ± 3 mm
≥ 50 mm
≥ 25 mm
V max - V min
x100% or
(V max + V min) / 2
x 100%
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