TITLE
Reader Head LED Voltage Calibration
(D424 P.C. Board Only)
NUMBER
TN-E550
REV
B
DEPARTMENT
Engineering
CREATED BY:
K. Hultgren
EFFECTIVE DATE
January 23, 2009
APPROVED BY:
L. Brown
Appendix L. Technical Notes
L-20
Document #: 9301H264001.1
This procedure applies only to reader heads with the D424 P.C. board. The D424 P.C. board was used in reader
heads with a date code of May 2006 or earlier. Newer reader heads use the F430 P.C. board which is self
calibrating and requires no adjustment. The P.C. board number can be viewed, without removing the cover, by
tilting the reader and looking just below the 9-pin connector (see examples below).
D424 Board
F430 Board
All reader heads, with the D424, must be periodically checked for proper gain. It is easily done using a multimeter
and with
NO
film loaded through the reader. For demonstration purposes, the reader is shown removed from the
projector.
1.5. TOOLS REQUIRED:
y
DDE or DTS player
y
1/16”
(1
.
58 mm
) Allen-head (
hex
) screwdriver
y
Multimeter
y
Timecode cable
y
Small flat-bladed screwdriver
c
Remove the reader’s back cover by removing the –4- hex screws. Save the screws.
