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5: Troubleshooting
Troubleshooting
Use the following checklists to troubleshoot anomalous MBX-4 receiver
operation. Table 5-1 provides a problem symptom, followed by a list of
possible solutions for troubleshooting operation of the MBX-4 receiver.
Table 5-1: MBX-4 Troubleshooting
Symptom Possible Solution
Receiver fails to power Verify polarity of power leads
Check 1.5 A in-line power cable fuse
Check integrity of power cable connections
Check power source output voltage (9-40 VDC)
Check current restrictions imposed by power source
(maximum > 0.5 A)
No data from MBX-4 Check receiver power status (display illuminated?)
Verify that MBX-4 is locked to a valid beacon (Lock symbol
engaged)
Check integrity of power, antenna, and data cable
connections
Receiver in MBX-4 or MBX-E mode only?
Random data from MBX-4 Check transmitting beacon status
Verify baud rate settings of MBX-4 and terminal device
(MBX-4 default baud rate = 4800 bd)
No signal lock Check antenna connections
Verify MSK rate is set correctly or choose Auto MSK rate
(100 200, or Auto)
Verify frequency of transmitting beacon, or choose Auto Bx
Search
Check MBA-3 antenna ground
Verify MBX-4 antenna port output voltage (10 VDC)
Verify 10 VDC across antenna cable connector
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