Dynamic Focus Check - Hitachi C47-WD7000 Service Manual

SERVICE ADJUSTMENTS

2.13 DYNAMIC FOCUS CHECK

Preparation for check
(1)The raster inclination, centering, horizontal/vertical amplitude and optical/electrical focus and beam alignment
should be adjusted.
(2) The static convergence data should be cleared.
(3) Contrast control should be set Max and Brightness control should be set Center.
(4) Receive the cross-hatch pattern signal.
Checking procedure
(1) Short-circuit the sub mini connectors of Red (R) and Blue (B) on the CPT P.W.B.and project the Green (G)
color.
(2) Turn the static focus VR for Green (G) so that the picture center is just in focus.
(3) Check that the focus does not get conspicuously worse at all edges of the picture.
Checking point for horizontal direction:
Checking points for vertical direction:
③ ⑨
⑥ ⑫
⑫
⑨
③
C
⑥
Static focus VR for green is
VR on Focus pack (UFPK).
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