TM 1-6625-724-13&P
0032 00
0032 00-1(0032 00-2 blank)
OPTICAL RPM SENSOR
GAIN ADJUSTMENT
Figures
Figure 1. Optical RPM Sensor PN 29314700................................................................................................................... 1
Initial Setup:
Personnel Required:
Aircraft Technician
Tools and Equipment:
Tool Kit, Electricians
Parts:
Optical RPM Sensor PN 29314700, NSN 6625-01-327-5323
Equipment Condition:
Sensor on workbench
a. Remove clear cover.
b. Adjust gain as indicated in figure 1.
c. Reinstall clear cover
OPTICAL TACHOMETER FAULT ISOLATION
OPTICAL RPM SENSOR P/N 29314700
ERROR CODE 16414, TACHO OUT OF BOUNDS
When photocell is
connected to DAU and
DAU has power, red
LED should illuminate
when reflective tape is
placed in photocell’s
path. LED should
pulsate, the faster
the pulse the stronger
the signal.
Gain
+
-
Cable
L.O.
D.O.
LED
Set gain to maximum.
Adjusting screw is turned
clockwise until a click is
heard or felt. If no click
is detected then turn screw
15 turns. Potentiometer is
clutched at end of travel,
you will not damage by
turning past maximum stop.
D.O./L.O. Screw should be
turned clockwise until it hits
stop. This will align the
screw with the D.O.
Reflective tape must be clean. Make sure that you do not use your fingers to press
tape into position. Use paper backing to press tape into place. Oils from your fingers
can smudge tape and reduce reflectivity. Water (rain) or oil leaks can cause same
problem. Minimum distance from photocell to tape should be no less than 4.5 inches.
3
4
1
2
Figure 1. Optical RPM Sensor PN 29314700 (NSN 6625-01-327-5323)
END OF WORK PACKAGE
