MFJ-993 IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2003-2004 MFJ Enterprises, Inc.
23
Here is the self-test procedure:
1. Turn off the power to the tuner, and press all buttons to the
out
position.
2. Unplug the radio interface cable, if one is connected, from the tuner.
3. If testing the MFJ-993RC Remote Control, connect it to the Remote Port and make sure both [ANT]
and [AUTO] buttons
on the tuner
are pressed to the
in
position.
4. Set volume to a comfortable listening level.
5. Press and hold
only
the [L-UP] button while turning the power on.
6. The test begins by displaying a copyright message and firmware version number, such as
COPYRIGHT (c) 2003-20YY MFJ ENTERPRISES, INC. VERSION YYWW
. This is the
test of the display. At the same time, the forward needle of the meter also goes up slowly to full scale
and then drops to zero, followed by the reflected needle going up slowly to full scale and then drops
to zero. This tests the meter. Release the [L-UP] button before the message completes. To skip this
copyright message, press [C-DN] button.
7. You will be prompted to press each of the front-panel buttons. The forward needle should bounce
once for each press, and the reflected needle should move up a division for each press.
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 displayed and sent as Morse code (di-dah-dah-
dit di-dah di-di-dit di-di-dit), and both meter needles will go to full scale. If there is a problem, a
failure message will be displayed and sent; also, the forward needle will bounce and the reflected
needle mark indicates the failure.
10. Once you have confirmed that the audio is okay, turn the unit off.
Failure
Message
Reflected
Needle (watts)
Indicates
ANT FAIL
1
[ANT] button is shorted or improperly connected.
MODE FAIL
2
[MODE] button is shorted or improperly connected.
C-UP FAIL
3
[C-UP] button is shorted or improperly connected.
C-DN FAIL
4
[C-DN] button is shorted or improperly connected.
L-UP FAIL
5
[L-UP] button is shorted or improperly connected.
L-DN FAIL
7.5
[L-DN] button is shorted or improperly connected.
AUTO FAIL
10
[AUTO] button is shorted or improperly connected.
TUNE FAIL
15
[TUNE] button is shorted or improperly connected.
Radio interface cable is connected but radio power is off.
MEMORY FAIL
20
Non-volatile memory circuitry is improperly connected.
WAKEUP FAIL
30
Microprocessor wakeup circuitry problem.
PD FAIL
40
Power down circuitry problem.
Table 4. 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.
Summary of Contents for MFJ-993
Page 2: ......
