MFJ MFJ-784B, Instruction Manual, Page: 66 / 74

MFJ-784B Instruction Manual
Appendix A-2
Self-Test
This self-test is used to test all the digital circuitry, switches, and controls of
the MFJ-784B.
To perform the self-test:
1. Turn the Filters switch to BP .
2. Push all buttons so they are in the "out" position.
3. Turn all knobs to full clockwise, except Volume . Set Volume to a
comfortable listening level.
4. Disengage the Power button and
remove the power plug
.
5. Remove the DSP's cover (6 screws).
6. Remove all jumpers from JMP1 to JMP7. Record their positions to re-
configure the unit after the self-test.
7. Reconnect power.
8. Press and hold the Program button.
9. Press and lock the Power button to "on."
10. Release the Program button. The unit sends SELF TEST in Morse code at
10 WPM . For the entire test, the LEDs should blink green once after
each operation. If the LEDs blink red the unit fails the test and a Morse
code message is sent to indicate the nature of the failure.
11. Test each button (except the Speaker and Power buttons) by pressing:
AGC , Program , Memory , Manual Notch , Auto Notch , Noise Reduction ,
and DSP buttons. Skip the Speaker and Power buttons. The LEDs
should blink green once after each button push.
12. Test the Filters switch by turning it to each position: LR/HR , BP , 2BP ,
CW , SSB , RTTY , HF PACKET , AMTOR , PACTOR , and SSTV/FAX/
WeFAX . The LEDs should blink green once after each turn of the switch.
13. Test the left Tunable Filters knob by turning it to full counter-clockwise
then to full clockwise. The LEDs should blink green once at each end.
14. Test the right Tunable Filters and Noise Reduction knobs in the same
way. The LEDs should blink green once at each end.
15. Test the jumper connections by placing plug-in jumpers on the "L"
positions of JMP1-JMP7 (JMP8 is not used).
Important : Performing the next step will reset the CW sidetone and the
Pre-Set data filters to factory defaults as described on page 4-
11. If you do not want these filters to reset to factory defaults,
stop this self-test now by releasing the
Power button.