Service manual

ALIGNMENT AND TEST PROCEDURES
7-3
Month 2000
Part No. 001-2004-601
7. The software programs the synthesizer for
1 MHz above the Receive frequency.
8. Receive sensitivity should be less than 0.35 µV.
(Typically less than 0.30 µV. )
9. The software programs the synthesizer for
1 MHz below the Receive frequency.
10.Receive sensitivity should be less than 0.35 µV.
(Typically less than 0.30 µV. )
11.Adjust the signal generator level to produce 15 dB
SINAD.
12.Adjust R221 for 0.5V ±0.02V at TP201.
FOR 25 kHz CHANNELS:
NOTE: Perform this test if C204 and C214 are placed
on the board.
1. Set the generator to an RF level sufficient to pro-
duce 2V DC at TP201.
2. Remove any modulation from the signal generator.
3. Increase the signal generator RF frequency 5 kHz.
4. Adjust C204 for peak DC voltage at TP201.
5. Adjust C249 for peak DC voltage at TP201.
6. Reset the signal generator to the tune-up frequency.
7. Set the generator to 100 µV into the receiver with a
1 kHz tone at ±3 kHz deviation.
(1000 µV at the generator with 20 dB pad gives
100 µV at the receive antenna.)
8. Tune Z205 for 2V ±0.05V at U201, pin 9.
9. Tune R220 for 387 mV RMS, ±5 mV RMS, at
TP202.
10.Adjust R216 for 2V ±0.05V at TP202.
11.Connect a distortion analyzer to TP202.
12.Tune L201, L203, L204 and L206 for minimum
distortion <5%, (typically <3%).
13.Repeat Step 12 then Steps 8, 9 and 10.
Figure 7-1 RECEIVER ALIGNMENT POINTS
2
1
19
20
Y201
J201
TP201
TP202
TP101
U304
U301
U303
TP501
R402
R403
TP401
L201
L203
C204
C239
C249
L204
L206
C214
Z205
Z215
TP205
R216
R248
U302
TP203
J204 J205
R219
R221
R220
R253
TP204
L139
L102
L104
L103
L108
L109
L110
L140
L141