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-22
Document #: 9301H264001.1
f
On older versions of D424 boards that have a trim pot but no test points, carefully connect your meter
as shown below and measure the voltage. Adjust trim pot for
4.0
volts DC on a multimeter.
+
-
Pin 7
Pin 4
Version “A” D424 boards do not have test points or a trim pot. In that case, measure the same as
above and if the voltage is not between 3
.
5 and 4
.0
volts DC, then you must do a repair-exchange on
the reader. Contact your local DDE dealer.
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