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12
DPX-8030MD
ADJUSTMENT (X16-1710-00)
Adjusting the CD disc sensor phototransistor de-
tection voltage (ver1.0)
Adjust semifixed potentiometers VR1 and VR3 to obtain the
following specified values for the CD DET (detector) termi-
nal voltage (checkland CD1).
•
When CD is loaded:
CD DET terminal voltage
(target value)
: 1.0 volts
CD DET terminal voltage
(allowable range) : 0.8 to 1.2 volts
•
When no CD is loaded:
CD DET (detector) terminal minimum voltage
: 4.0 volts
∗
CD used for alignment should be an Audio Test
CD: TCD-781/TCD-784 or CD having infrared
light reflectivity with
±
5% of TCD-781.
Align the semifixed potentiometers VR1 & VR3
Load the CD in the unit, turn on the power (5volt
±
0.1volt)
and adjust while monitoring the CD DET terminal voltage.
Semifixed potentiometers VR1 & VR3 can be aligned as
follows using orientation in fig. 1 (attached sheet).
•
Turning clockwise (to right)
Raises CD DET voltage
•
Turning counterclockwise (to left)
Lowers CD DET voltage
When CD detector voltage is LESS THAN target value
∗
Turn VR3 clockwise (to right) so CD Detector terminal vo-
ltage is between 0.8 to 1.2 volts.
∗
If target value was reached just by using VR3, then don’t
touch VR1 and make the alignment using just VR3.
∗
If the CD DET voltage is lower than the target value even
with VR3 turned (all the way), then turn VR1 clockwise (to
right). To make fine adjustments near target value, use
VR3 and leave VR1 turned.
When CD detector voltage is HIGHER THAN target value
∗
Turn VR3 counterclockwise (to left) so CD Detector volta-
ge is between 0.8 to 1.2 volts.
∗
If target value was reached just by using VR3, then don’t
touch VR1 and make the alignment using just VR3.
∗
If the CD DET voltage is higher than the target value even
with VR3 turned (all the way), then turn VR1 counterclock-
wise (to left). To make fine adjustments near target value,
use VR3 and leave VR1 turned.
After aligning the CD DET terminal voltage, remove the CD
and check the CD DET terminal voltage, if 4 volts or more,
then the alignment is okay.
R8
R5
R9
PH3
1
6
VR1
UP
Turning clockwise (to right)
Turning counterclockwise (to left)
CD
VR3
fig.1
(X16-1710-00/J74-1360-02) : Foil side view
D8
CN1
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