MFJ-422E/422EX Instruction Manual
Electronic Keyer Paddle
8
A self test is included to perform testing of the paddle, the buttons, the controls,
and the audio circuitry. At any time, turn off the power to stop the self test.
To perform this test:
1. Turn off the power and remove the power plug.
2. Push all buttons so they are in the out position.
3. Turn all knobs to full clockwise position, except the Volume control. Set
volume to a comfortable listening level.
4. Remove the case by removing the screws on the bottom that secure it to the
paddle.
5. Remove jumpers JMP4 to JMP7. Set jumper JMP3 to the "B" position. Set
jumpers JMP8 and JMP9 to the "H" position.
6. Reconnect
power.
7. Squeeze the paddle while turning the power on. The self test starts by
sending the copyright message
"COPYRIGHT 1996-XXXX MFJ ENTERPRISES,
INC. VERSION X.XX"
confirming the audio circuitry is working properly.
Release the paddle before the message is finished. For the entire test, the
LED should blink once after each operation. If the LED blinks
continuously the unit fails the test and a Morse code message is sent to
indicate the nature of the failure.
8. The paddle, the buttons, and jumpers JMP3 to JMP9 are automatically
tested for shorts to ground. The LED should be off at this point.
9. Press and release the dot level; press and release the dash level.
10. Press and release the
Message
button.
11. Lock in the
Semi-Auto/Auto
button, then press and release the dash level.
12. Test the
Speed
control by turning it to full counter-clockwise then to full
clockwise. The LED should blink once at each end.
13. Test the
Weight
and
Tone
controls in the same way. The LED should
blink once at each end.
14. Test the jumper connections by placing the plug-in jumpers on the "A"
position of JMP3 and the "L" positions of JMP4 to JMP9 in ascending
order. The LED should blink once for each jumper.
15. When all is okay, a repetitive message
"PASS"
is sent to the speaker. A
repetitive message such as
"SP FAIL"
indicates that you did not follow the
correct order or the unit failed the test.
16. Turn off the power after confirming the audio has good quality and remove
the power plug.
17. Replace all jumpers to their original positions.
18. Replace the case on to the paddle and secure it with the screws.
19.
Reconnect power and resume with normal operation.
Memory Test