TITLE
Reader Head LED Voltage Calibration
(D424 P.C. Board Only)
NUMBER
TN-E550
REV
B
PAGE
DEPARTMENT
Engineering
CREATED BY:
K. Hultgren
EFFECTIVE DATE
January 23, 2009
APPROVED BY:
L. Brown
Appendix L. Technical Notes
L-21
Document #: 9301H264001.1
d
First, set the meter to DC volts. Connect leads to TP1 (“+” signal) and TP2 (ground) on the D424
board. Then, connect the reader to a powered DDE or DTS player. The reader gets its power from the
player.
e
Adjust R16 trim pot (on
Rev. E
and higher D424 boards) for
4.0
volts DC on the multimeter. If you
cannot achieve the correct voltage, the LED may be damaged or aged. Older version D424 boards
may not have a trim pot. In that case, if the voltage is not between 2
.
5 and 4
.0
volts DC, then you
must do a repair-exchange on the reader. Contact your local Datasat Digital Entertainment (DDE)
dealer.
Adjust trim pot until
the volt meter reads
4 volts DC
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