MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2006 MFJ Enterprises, Inc.
17
Self Test
A self-test routine will check the functions of the MFJ-925. This routine checks the LEDs, the front-
panel buttons, the internal memory, the audio circuitry, and the power-down circuitry. During the self-
test, you may stop the test by turning off the unit; however, this should NOT be done during the memory
test or the memory could be corrupted. The self-test can be completed in approximately 10 seconds.
Note: Performing the self-test will reset the unit to its factory default settings.
Here is the self-test procedure:
1. Turn off the power to the tuner.
2. Unplug the radio interface cable, if one is connected, from the tuner.
3. Press and hold
only
the [TUNE] button while turning the power on.
4. The test begins by blinking the firmware version number via the two front panel LEDs. The
green LED blinks first, followed by the red LED. The version number X.Y is represented by the
number of times the green LED blinks for X and the number of times the red LED blinks for Y.
For example, green LED blinks one time and red LED blinks two times represent firmware
version number 1.2. This is also the test of the LEDs.
5. Release the [TUNE] button. The unit then checks for short circuits, power-down detection level,
and wakeup circuitry.
6. Press [ALT] button and the green LED should blink once.
7. Press [TUNE] button and the green LED should blink once.
8. The unit then tests its non-volatile memory. Notice this step will reset the unit to its factory
default settings.
9. If the unit 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, a failure message will be
sent repetitively and the red LED will blink.
10. Once you have confirmed that the audio is okay, turn the unit off.
11. Wait one second and turn the unit on again to test the power-down detection circuitry.
12. 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.
13. Turn the power off.
Failure
Message
Indicates
ANT FAIL
[ALT] button is shorted or improperly connected.
TUNE FAIL
[TUNE] button is 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.
Table 4. Failure Messages.
Summary of Contents for MFJ-925
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