Hitachi C21-RF80S Service Manual - Page 23

Purity And Convergence Adjustment - colour tv

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PURITY AND CONVERGENCE ADJUSTMENT COLOUR PURITY ADJUSTMENT (1) Before colour purity adjustment,warm up the TV set over 15 minutes and fully degauss. (2) Receive pure white signal in AV status and press PIC.MODE key to set picture in DYNAMIC mode. (3) Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards the purity magnet. (4) Adjust purity magnet to make the green area at the center of CRT screen. (5) Slowly push the deflection yoke toward the front of CRT and set it where a uniform green field is obtained. Tighten the clamp screw of the deflection yoke. CONVERGENCE ADJUSTMENT (1) Receive a dotted pattern. Press PIC.MODE key to set picture in DYNAMIC mode. (2) Loosen the convergence magnet clamper and align red with blue dots at the center of the screen by rotating(RB) static convergence magnets. (3) Align Red/Blue with green dots at the center of the screen by rotating(RB-G) static convergence. magnet. (4) Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to obtain the best convergence result. RB-G Purity Magnet RB Magnet Clamper Static Magnet -23-

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COLOUR PURITY ADJUSTMENT
(1)
Before colour purity adjustment,warm up the TV set over 15 minutes and fully degauss.
(2)
Receive pure white signal in AV status and press
PIC.MODE
key to set picture in DYNAMIC mode.
(3)
Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards the purity
magnet.
(4)
Adjust
purity magnet to make the green area at the center of CRT screen.
(5)
Slowly push the deflection yoke toward the front of CRT and set it where a uniform green field is
obtained. Tighten the clamp screw of the deflection yoke.
CONVERGENCE
ADJUSTMENT
(1)
Receive a dotted pattern. Press
PIC.MODE
key to set picture in DYNAMIC mode.
(2)
Loosen
the convergence magnet clamper and align red with blue dots at the center of the screen by
rotating(RB) static convergence magnets.
(3)
Align Red/Blue with green dots at the center of the screen by rotating(RB-G) static convergence.
magnet.
(4)
Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to obtain the
best convergence result.
Purity Magnet
RB-G
RB
Magnet Clamper
Static Magnet
PURITY AND CONVERGENCE ADJUSTMENT
-23-