MFJ-998RT Legal Limit IntelliTuner
TM
Automatic Remote Antenna Tuner Instruction Manual
© 2011 MFJ Enterprises, Inc
MFJ-998RT Version 1A
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6. The unit then tests its non-volatile memory. Notice this step will reset the unit to its factory default
settings.
7. If the unit is okay, a repetitive message PASS will be displayed and sent as Morse code (di-dah-
dahdit di-dah di-di-dit di-di-dit). If there is a problem, a failure message will be displayed and sent
repetitively.
8. Once you have confirmed that the audio is okay, turn the unit off.
9. Turn the unit on again to test the power-down detection circuitry.
10. If the power-down detection circuitry is okay, a repetitive message PASS will be displayed and
sent as Morse code (di-dah-dah-dit di-dah di-di-dit di-di-dit). If there is a problem, message PD
FAIL will be displayed and sent as Morse code repetitively.
11. Turn the power off.
Failure Message
Indicates
ANT FAIL
[ANT] shorted or improperly connected.
MODE FAIL
[MODE] shorted or improperly connected.
C-UP FAIL
[C-UP] shorted or improperly connected.
C-DN FAIL
[C-DN] shorted or improperly connected.
L-UP FAIL
[L-UP] shorted or improperly connected.
L-DN FAIL
[L-DN] shorted or improperly connected.
TUNE FAIL
[TUNE] shorted or improperly connected.
MEMORY FAIL
Non-volatile memory circuitry is improperly connected.
WAKEUP FAIL
Microprocessor wakeup circuitry problem.
PD FAIL
Power-down circuitry problem.
Figure 11 Failure Messages
Power-Down Circuit Test
When the 12 VDC power to the tuner is turned off, the tuner saves all settings to non-volatile memory.
The Power-Down Circuit Test checks the power down detection circuitry. It is recommended that this test
be done immediately after the regular self-test described above.
Note: The tuner must be reset to factory defaults before performing this test.
Power-Down test procedure:
1. Make sure power to the tuner is off.
2. If the tuner has been reset to factory defaults, skip to step 6; otherwise continue with step 3.
3. Press and hold both the [TUNE] and [L-UP] buttons while turning the power on.
4. Release the buttons when DEFAULTS RESET appears on the display.
5. Turn the power off.
6. Press and hold only the [L-DN] button while turning the power on.
7. If the power-down detection circuitry is okay, a repetitive message PASS will be displayed and
sent as Morse code (di-dah-dah-dit di-dah di-di-dit di-di-dit). If there is a problem, message PD
FAIL will be displayed and sent as Morse code repetitively.
8. Turn the power off.
