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BENDIX/KING KLN 90B
Rev 5, April/2003 10521I05.TDC Page 2-65
2.4 POST INSTALLATION CHECK OUT INFORMATION
2.4.1 KLN 90B RESOLVER CALIBRATION METHOD
The KLN 90B supports both 400 Hz and 30 Hz resolvers. However, to assure maximum
accuracy, the KLN 90B will need to be calibrated so that it will work with either type. The
following is a procedure for calibrating the resolver in the KLN 90B.
1. With the unit off, press and hold the left cursor button.
2. Turn the unit on, continuing to hold the left cursor button for at least 8 seconds.
3. Allow the unit to start up normally.
4. Make sure that the unit has an active waypoint and the aircraft is located where it can
acquire a valid satellite position.
5. Put the unit into the OBS mode by pressing the external switch (if installed) or by using
the MOD 2 page.
6. Turn to the STA 3 page using the left inner and outer knobs.
7. Make sure that the KLN 90B is the displayed NAV source on the desired indicator.
8. Using the course pointer (for HSIs) or the OBS knob (on CDIs), adjust the selected
course to 0°.
9. Note what the KLN 90B is using for the OBS angle (shown on the bottom line near the
center of the screen). If the OBS angle on the KLN 90B agrees with the selected course
on the external indicator, then no calibration is necessary.
10. If the two values do not agree, then the KLN 90B will need to be calibrated. This is done
by pressing the left cursor button and adjusting the value next to OBS CAL. A value of
100 is the default setting and represents no correction. It is possible to make adjustments
of up to ; 10°. An OBS CAL value of 0 represents -10° and an OBS CAL value of 200
represents a calibration of + 10°.
11. Once the KLN 90B agrees with the external indicator, then the calibration is complete.
Turn off the left cursor button.
12. Reset power to restore normal operation.
2.4.2 POST INSTALLATION CHECKOUT PROCEDURE
This procedure is divided into two major sections. The first section deals with "Stand Alone" in-
stallations in which none of the signal Input/Output capability of the unit is utilized, (except for the
RF input signal from the antenna). In this type of installation the only connections to the KLN 90B
are the cable from the GPS antenna, the aircraft power and ground leads, and the lighting bus
wires. Connect the unused ARINC 429 Airdata Receiver to the 429 Transmitter and connect the
unused RS 232 IN to the RS 232 OUT. All output data is read from the unit front panel display
and all input to the unit is via the front panel controls.