MFJ-1270C/1274C MANUAL TROUBLESHOOTING
Page 223
Symptom: The MFJ-TNC appears to have "lock-up" i.e. not
responding to any commands.
This may be due to some invalid parameters having been stored in the memory.
Try turning the MFJ-TNC off and disconnect JMP 5 on the MFJ-TNC board.
This will disconnect the memory back-up circuit and allow the memory to be
erased. Re-install JMP 5 after about 2 minutes and try operating again.
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