Honeywell Bendix/King KX 165A Maintenance Manual page 63

BENDIX/KING
5.2.2.3.2 NAV RF Preselector Alignment
NOTE: These steps are performed with the unit out of the alignment mode.
1. Monitor the DC IF AGC voltage at TP3007 (or P3001-28) using a DVM. Ground
TP3022, TP3024, TP3026, and TP3028 (grounding can be done by placing a blob
of solder between each of these testpoints and an adjacent grounded testpoints).
Set signal generator for +10dBm power level initially. Signal Generator power level
should be varied as necessary to keep the TP3007 AGC voltage between 1.2 and
1.6V.
2. Tune NAV receiver to 110.70 MHz. Apply a 110.70 MHz signal from a signal gen-
erator to the NAV antenna input. Adjust C303 (Pole 1) for a maximum voltage at
TP3007.
3. Tune NAV receiver to 109.80 MHz. Apply a 109.80 MHz signal from a signal gen-
erator to the NAV antenna input. Disconnect TP22 ground jumper and connect
TP3020 ground jumper. Adjust C220 (Pole 2) for a maximum voltage at TP3007.
4. Tune NAV receiver to 112.20 MHz. Apply a 112.20 MHz signal from a signal gen-
erator to the NAV antenna input. Disconnect TP3024 ground jumper and connect
TP3022 ground jumper. Adjust C326 (pole 3) for a maximum voltage at TP3007.
5. Tune NAV receiver to 113.00 MHz. Apply a 113.00 MHz signal from a signal gen-
erator to the NAV antenna input. Disconnect TP3026 ground jumper and connect
TP3024 ground jumper. Adjust C252 (Pole 4) for a maximum voltage at TP3007.
6. Tune NAV receiver to 113.80 MHz. Apply a 113.80 MHz signal from a signal gen-
erator to the NAV antenna input. Disconnect TP3028 ground jumper and connect
TP3026 ground jumper. Adjust C305 (Pole 5) for a maximum voltage at TP3007.
7. Remove all ground jumpers.
5.2.2.3.3. NAV IF Filter Alignment
1. Tune NAV receiver to 113.50MHz. Apply a 113.50MHz, -50 dBm, FM signal sine
wave modulated with 30 KHz peak deviation at a 30 Hz rate to the NAV antenna in-
put.
2. Monitor TP3030 (Q3035 collector) using a scope probe and oscilloscope. Set scope
for 1msec/div and external trigger on the sine wave modulation generator. Adjust
L3033 and L3034 so that the 20.5MHz envelope is at a maximum flat response.
5.2.2.3.4 NAV RF AGC Alignment
1. In the alignment mode, advance to the NRAG page. Apply a -70 dBm, 113.50 MHz
, 30 % modulated at 1kHz, input signal and adjust NRAG for 0 +/- 0.35VDC at
P3001-29. Increase the input level to +6 dBm and monitor the composite output
(P3001-24) on a scope. Ensure that the 1 kHz signal is not noticeably distorted.
5.2.2.3.5 PLL (This is a manual adjustment located on the main board)
1. Attach a frequency counter to TP1001.
Rev 0, Jun/2000 15610M00.RCD
KX 165A
Page 5-15