User's Manual

385700-1006-006 MAINTENANCE AND TROUBLESHOOTING
Document use is restricted to that described on cover 5-11
Figure 5-6 MDR Receiver Fault Isolation Test Setup
5.5.4 MDR ONLY RECEIVER FAULT ISOLATION TEST
After preparing for the test, perform the following steps to isolate the receiver fault:
8. Place MDR power switch to the
ON
position.
9. Bring up the Diagnostic LCP screen. Refer to section 2.5.2 for details. Verify
that the radio self test is completed successfully.
10. After the LCP menu appears, select command #12 (Set Lower Threshold). Set
the lower threshold to 01.
11. Select command #14 (Set Lower Lock Threshold). Set upper threshold to 01.
12. Select command #10 (Set Upper Threshold). Set lower lock threshold to 02.
13. If the MDR does not light the RECEIVER LOCK indicator, replace the MDR.
14. Select command #10 (Set Upper Threshold). Set the lower threshold to FF.
15. Select command #12 (Set Lower Threshold). Set upper threshold to FE.
16. Select command #14 (Set Lower Lock Threshold). Set lower lock threshold to FE.
17. If the MDR RECEIVER LOCK indicator is still on, replace the MDR.
18. Place MDR power switch to the
OFF
position.
5.5.5 MDR/BDR RECEIVER TEST SETUP
Referring to Figure 5-7, perform the following to prepare for the MDR receiver test setup:
Note: This test requires the use of a fully functional BDR.
1. Place MDR and BDR power switches to the
OFF
position.
2. Place 20 dB power attenuator on the BDR
ANTENNA
port. Place an additional
20 dB of attenuation to the power attenuator attached to the BDR. Connect a
20 dB power attenuator to the MDR at the
ANTENNA
port. Place an additional
20 dB of attenuation to the power attenuator attached to the MDR.
3. Connect a N cable from the BDR attenuator to the MDR attenuator.
4. Connect a PC to each radio with diagnostic cables at the
DIAGNOSTIC
ports.
5. Connect power to the units. Place MDR and BDR power switches to the
ON
positions, and bring up the Diagnostic LCP screens. Refer to section 2.5.2 for
details. Verify that the radio self test is completed successfully.
PC
MDR
Diagnostic
J4
Antenna
J5
20 dB
Power
Attenuator