Alignment Procedure; Geometry Distortion; Tilt - Hitachi CM621FET Service Manual

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D. ALIGNMENT PROCEDURE
• Warm up the monitor for at least 30 minutes before adjustment.
• Set the front of CRT to the east.
• Turn all VR set to center position.
D-1.
H.V
1.
Use front control key adjust the display size about 300mm, adjust VR801 Let the High voltage of Circuit
is 26KV in Timing 68K mode CROSS PATTERN.
E. GEOMETRY DISTORTION
1. Pincushion
Pincushion(top)
Pincushion(bottom)
Pincushion(leftside)
Pincushion(rightside)
"S" distortion
2. Barrel
Barrel(top)
barrel(bottom)
barrel(leftside)
barrel(rightside)
3. Trapezoid & Parallelogram distortion
F. TILT
The maximum variation of the display rotation (tilt) shall be such that the following relationship shall be
met:
d1<=2.0mm(p) or 2.5mm(s)
d2<=2.0mm(p) or 2.5mm(s)
a1<=1.5mm
a2<=1.5mm
<=0.5mm(p) or <1mm(s)
c1<=2.0mm
c2<=2.0mm
b1<=1.0mm
b2<=2.0mm
a<=2.5mm (p) or 3.0mm (s)
b<=2.5mm (p) or 3.0mm (s)
DEGREE
<=0.5
2
FACE EAST

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