Honeywell Bendix/King KX 165A Maintenance Manual page 59

BENDIX/KING
5.2.2.1 Display
5.2.2.1.1 Display Brightness
Sets the minimum brightness level of display.
1. Go to the BRIM page.
2. Adjust the Nav INC/DEC knob to achieve the desired brightness during minimum
ambient light, i.e. completely darkened cockpit.
5.2.2.1.2 Photo Cell
Automatically calibrates the photo cell for specific brightness over varying ambient light conditions
from one radio to another. Requires a calibrated light source of 40 footlamberts. PHOT IS NOT
RECOMMENDED FOR ALIGNMENT IN THE FIELD. Instead use the Photo Cell Offset adjust-
ment which is described below.
5.2.2.1.3 Photo Cell Offset
Manually calibrates photo cell for specific brightness over varying ambient light conditions from
one radio to another. This can be used to adjust the display brightness to match other units in the
airplane avionics panel.
1. Go to the PHOF page
2. Use Nav inner tuning knob to adjust brightness to desired level.
5.2.2.2 Communication Receiver Alignment
5.2.2.2.1 Reference Oscillator
Prior to making this adjustment, allow the unit to stabilize at room temperature with the unit turned
off.
1. Connect comm antenna to a frequency counter through appropriate attenuator.
Turn the unit on and key the transmitter to read frequency at 127.500 MHz.
NOTE: If the frequency is in error by more than 122 Hz, enter the alignment mode.
2. For radios lacking the 8.33 kHz option:
Go to REF page and adjust frequency using the NAV inc/dec knobs until the transmit
frequency is within 127.500000 MHz + 122 Hz.
For radios with the 8.33 kHz option:
Adjust the TCXO located on the COM/VOR Receiver board until the transmit fre-
quency is 127.500000 MHz ± 122 Hz.
5.2.2.2.2 COM VCO
5.2.2.2.2.1
1. Tune COM Receiver to 136.900MHz with the unit out of the alignment mode.
2. Monitor the DC voltage at TP3003 (or P3001-12). It should be 8.4 +0.1/-0.4 V.
3. If adjustment is necessary, enter the alignment mode and go to the CVCO page.
Using the Nav inc/dec knobs, increase the value if the voltage at TP 3003 was too
Rev 0, Jun/2000
Radios lacking the 8.33 kHz option.
15610M00.RCD
KX 165A
Page 5-11