Dac; Lcd; After - Casio CZ-1 Service Manual And Spare Parts List

26.
ADJUSTMENT
25-1.
DAC
Offset
Voltage
Adjustment
vdao
OUT
(1
)
Connect
a digital
vo.tmeter
between pin
13
of
DAC
BA9221
and pin
1
of
opamp
TL082-1.
(Refer
to
check point (A)
on
page
1
1
)
(2)
While the
test
unit
is
not producing any
sound,
adjust
VR3
so that the digital
voltmeter reading
is
—3
±
3m
V.
Note:
Be
sure to use a digital
voltmeter.
iMAIMPCBl
26-2.
VSS1
Voltage
Adjustment (Power Source for
MSM6200)
voo
To
MSM6200
DPG
[MAIM
PCB|
(1)
Measure
VDD
(+5V)
accurately.
(2)
Connect
a digital
voltmeter
between
pin
5 of
opamp M4558-2
and ground
DPG.
(Refer to
check
point®
on page
1 1
)
(3)
Adjust
VR1
so that Vss1
is
2.25
1
0.05V.
Note:
Be
sure to use a
digital
voltmeter.
25-3.
LCD
Brightness
Adjustment
Turn
the
VR2
on
PCB
MAIM
all
the
way
counter clockwise.
25-4. After
Touch
Adjustment
Turn
the
VR4
on PCB
MAIM
all
the
way
clockwise.
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