MFJ-928 Compact IntelliTuner Automatic Antenna Tuner Instruction Manual
© 2005 MFJ Enterprises, Inc.
18
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.
Here is the 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 only the [ANT] button while turning the power on. Both LEDs will blink until the
button is released.
4. Within four seconds of releasing [ANT], press the [TUNE] button once.
5. After releasing [TUNE] for four seconds, beep three times and turn the power off.
6. Press and hold only the [ANT] button while turning the power on. Both LEDs will blink until the
button is released.
7. Within four seconds of releasing [ANT], press the [TUNE] button four
times.
8. After releasing [TUNE] for four seconds and if the power-down detection circuitry is okay, a
repetitive message “PASS” will be sent as Morse code (di-dah-dah-dit di-dah di-di-dit di-di-dit)
and the green LED will blink. If there is a problem, message “PD FAIL” will be sent as Morse
code repetitively and the red LED will blink.
9. Turn the power off.
Relay Test
WARNING: Turn off the transmitter power or disconnect the transmitter before performing
this test; otherwise, damage to the tuner can result.
To test the relays and their control circuitry;
1. Turn off the power to the tuner.
2. Press and hold only the [ANT] button while turning the power on. Both LEDs will blink until the
button is released.
3. Within four seconds of releasing [ANT], press the [TUNE] button five
times.
4. After releasing [TUNE] for four seconds, beep once and the Relay Test routine is initiated.
5. Press the [TUNE] button to engage the relay and the red LED will turn on. Release the [TUNE]
button to disengage the relay and the red LED will turn off. Listen for relay clicks.
6. There are 19 relays in the tuner. Press the [ANT] button to test the next relay. The green LED
will illuminate until the [ANT] button is released.
7. Repeat Steps 5 and 6 to test all 19 relays (in the order of relay K1 to K19).
8. After releasing [ANT] on the 19
th
relay, beep three times and resume normal operation.
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