DPX-8030MD
ADJUSTMENT (X16-1710-00)
Adjusting the CD disc sensor phototransistor de- When CD detector voltage is LESS THAN target value
tection voltage (ver1.0)
Turn VR3 clockwise (to right) so CD Detector terminal vo-
Adjust semifixed potentiometers VR1 and VR3 to obtain the ltage is between 0.8 to 1.2 volts.
following specified values for the CD DET (detector) terIf target vmi-alue was reached just by using ?t VR3, then don
nal voltage (checkland CD1).touch VR1 and make the alignment using just VR3.
"When CD is loaded:If the CD DET voltage is lower than the target value even
CD DET terminal voltage with VR3 turned (all the way), then turn VR1 clockwise (to
(target value): 1.0 voltsright). To make fine adjustments near target value, use
CD DET terminal voltage VR3 and leave VR1 turned.
(allowable range) : 0.8 to 1.2 volts
When CD detector voltage is HIGHER THAN target value
"When no CD is loaded:
CD DET (detector) terminal minimum voltage Turn VR3 counterclockwise (to left) so CD Detector volta-
: 4.0 voltsge is between 0.8 to 1.2 volts.
CD used for alignment should be an Audio Test If target value was reached just by using ?t VR3, then don
CD: TCD-781/TCD-784 or CD having infrared touch VR1 and make the alignment using just VR3.
light reflectivity with ?5% of TCD-781.
If the CD DET voltage is higher than the target value even
with VR3 turned (all the way), then turn VR1 counterclock-
Align the semifixed potentiometers VR1 & VR3wise (to left). To make fine adjustments near target value,
Load the CD in the unit, turn on the po?0.1vwer (5volt) olt
use VR3 and leave VR1 turned.
and adjust while monitoring the CD DET terminal voltage.
Semifixed potentiometers VR1 & VR3 can be aligned as After aligning the CD DET terminal voltage, remove the CD
follows using orientation in fig. 1 (attached sheet).
and check the CD DET terminal voltage, if 4 volts or more,
"Turning clockwise (to right)then the alignment is okay.
Raises CD DET voltage
"Turning counterclockwise (to left)
Lowers CD DET voltage
CD
UP
D4D3
R5
PH1
D8R8
16
VR3 VR1
Turning clockwise (to right)
CN1
Turning counterclockwise (to left)
R9
PH3
(X16-1710-00/J74-1360-02) : Foil side view
fig.1
12 |
ACEC
