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Hitachi H972 Service Manual page 21

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2. Deflection circuit
2.1 SUB H.SIZE adjustment
(1) Turn the switch of the unit off.
(2) Connect a Digital multimeter across C771.
(3) Turn the switch of the unit on.
(4) Receive normal cross hatch pattern of signal 94A.
(5) Adjust H.SIZE to maximum and S.Pincushion minimum by the Front Key.
(6) Adjust R811 to the C771 voltage value to 130  0.5V.
(7) Receive normal cross hatch pattern of signal 30C and check the C771 voltage is at 42.5  1.5V.
2.2 High voltage adjustment
(1) Turn the switch of the unit off.
(2) Connect a high voltage meter, which is capable to measure up to 40kV, between CDT anode and GND.
(3) Receive normal cross hatch pattern of 94A signal.
(4) Turn the switch of the unit on.
(5) Adjust high voltage level to 27.0  0.3kV using R747.
(6) Turn the switch of the unit off.
(7) Remove the adjustment jig.
adjustment
 21 

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