MFJ MFJ-925, Инструкция по эксплуатации

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MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner Instruction Manual
©
2006 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 [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
4. Within four seconds of releasing [ALT], 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 [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
7. Within four seconds of releasing [ALT], 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 [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
3. Within four seconds of releasing [ALT], 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 18 relays in the tuner, yet there are 19 test positions. The second relay tested (K2) is
not used in this unit. There will be no relay click for K2. Press the [ALT] button to test the next
relay. The green LED will illuminate until the [ALT] button is released.
7. Repeat Steps 5 and 6 to test all 18 relays (in the order of relay K1 to K19, K2 is not used in this
unit).
8. After releasing [ALT] on the 19
th
test position, the unit will beep three times and resume normal
operation.