AOJUSTMENT | 8. Adjustment of Brightness Contrai Circuit |
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12)Tum the dia! of power switch S1 (@) to make the indication of DC ammeter M1 ( @ ) minimum.
In this case, the voltage of variable resistor VR2 ( @ ) will be maximum.
13)If the DC ammeter M1 C@) indicates a value not higher than 1.8, tum the shaft of variable resistor VR (@ ) in the printed circuit, counterclockwise, and if it indicates
a higher value than 2.5, slowly tum the shaft clockwise, until the meter indicates a value within the range 1.8 - 2.5V.
14)Fully tum the dia! of power switch S1 (e) to make sure that the brightness of the lamp and swing of the needle in the DC ammeter M1 ( @ ) changes smoothly
over 11.5.
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