Nikon Labophot - Adjustment of Brightness Contrai Circuit

AOJUSTMENT
8. Adjustment of Brightness Contrai Circuit
12) Tum the dia! of power switch S
1
(@) to make the indication of DC ammeter
M
1
(
@ ) minimum.
In this case, the voltage of variable resistor VR
2
( @ ) will be maximum.
13) If the DC ammeter M
1
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 S
1
(e) to make sure that the brightness of
the lamp and swing of the needle in the DC ammeter M
1
(
@ ) changes smoothly
over 11.5.
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