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'
..
(
.4
04.A
ADJUSTMENT
8.
Adjustment
of Brightness Control Circuit
8.
Adjustment
of
Brightness Control Circuit (Fig.
51,
52)
!)
Tum
off
the power switch 5
1
(
~
).
2) Fully tum (
~
) the shait of variable resistor
VR
3
in
the
DC
ammeter M
1
(
@),
counterclockwise.
3) Fully tum (
~
) the shait of variable resistor
VR
1
(e@
)
in
the printed circuit
counterclockwise.
4)
Change
over the power change-over switch Sl (
~
)
to
AC
1
OOV.
5)
Set the power voltage to
AC
1
OOV
± 1
%,
5
Hz.
6) Connect the thermostat·type voltmeter (
over
l
.5
class)
for
measuring the
lamp
voltage
to
the terminal
of
the lamp.
7)
Plug
the power source cord into the socket.
After connecting the halogen
lamp
of l 2V,
SOW
with the lamp socket.
8) Tum on the power switch S
1
(
~
).
Do
not tum the power switch
dial
beyond the position where the swttch
is
just turned
ON
(at a maxirnum voltage
of
variable resistor
VR
1
(
~
).
ln
this position the brightest illumination will
be
obtained .
...--...
9) Slowly
tum
thP.
shaft of
variabie
res1stor
VR
1
(
~
)
in
the printed circuit, clockwise,
and then the illumination
oi
the
lamp
will
be
slowly darkened.
Stop this tuming at the position where the lamp filament looks dim.
Do
not
tum
the shaft beyond this limit, because the lamp
will
glow
suddenly.
10) Tum the
dial
of
power switch S
1
(
~)
in
the direction
in
which the voltage
of
variable
resistor
VR
2
(
@ ) becomes lower, until the thermostat-type voltmeter
indicates 9.0V.
11) Tum the shaft
of
variable resistor
VR
3
(
~)
for sensitivity adjustment, clockwise,
so
that the
DC
ammeter M
1
(@
) indicates 9
.OV.
-44
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