MFJ MFJ-464 - Troubleshooting and Diagnostics; Failure Message Explanations; Power Down Circuit Test

MFJ-464 Instruction Manual CW Keyer/Reader
42
8. Test the Set dial control by slowly turning it to the left 10 clicks and then slowly turning it to
the right 10 clicks. Make sure not to turn the dial in the wrong direction. The LED should
blink once at the 10
th
click on each direction.
9. The unit then tests its non-volatile memory. Notice this step will reset the unit to its factory
default settings.
10. If the unit is okay, a repetitive message PASS will be displayed and sent as audio. If there is
a problem, a failure message will be displayed and sent.
11. Once you have confirmed that the audio is okay, turn the unit off.
Failure Message Meanings:
• DASH FAIL Dash paddle (ring of the plug) is shorted or improperly connected.
• DOT FAIL Dot paddle (tip of the plug) is shorted or improperly connected.
• MEMORY FAIL Non-volatile memory circuitry is malfunction.
• MODE FAIL Mode button is shorted or improperly connected.
• MSG1 FAIL MSG1 button is shorted or improperly connected.
• MSG2 FAIL MSG2 button is shorted or improperly connected.
• MSG3 FAIL MSG3 button is shorted or improperly connected.
• MSG4 FAIL MSG4 button is shorted or improperly connected.
• PD FAIL Power down circuitry is malfunction.
• SET FAIL Set dial control is malfunction.
Power Down Circuit Test
This test checks the power down circuitry. It is recommended that this test should be done
immediately after the regular self test described above.
Note: The keyer must be reset to factory defaults before performing this test.
Here is the test procedure:
1. Make sure power to the keyer is off.
2. If the keyer has been reset to factory defaults, skip to step 7; otherwise continue with step 3.
3. Press and hold both the Mode and MSG2 buttons while turning the power on.
4. Release both buttons when DEFAULTS RESET appears on the display.
5. Make sure the display shows s13.
6. Turn the power off.
7. Press and hold only the MSG2 button while turning the power on.
8. If the power down circuitry is okay, a repetitive message PASS will be displayed and sent as
audio. If there is a problem, message PD FAIL will be displayed and sent as audio
repetitively.
9. Turn the power off.