MJ-X Troubleshooting Guide AED-000025-04
Siemens T&D
LLC
8 version: 5 January 1998
10. Backdoor Tests
Enter the “Backdoor Test” mode as follows:
1. For MJ-X Main Processor software versions prior to 2.30: Adjust input voltage or the MJ-X Voltage
and Bandwidth setpoints to achieve an in-band condition—i.e., deactivate J and K outputs.
2. Display the "Data Stat = XXXX" screen under the <COMMUNICATIONS> menu.
3. Set the Remote/Auto/Manual (“R/A/M”) Switch to Remote and the U2/P2 Switch to U2.
4. Press the following keys in the order listed: Left Arrow, Right Arrow, Left Arrow, Right Arrow, +/-.
While in the backdoor test mode, the Alert LED blinks continuously (at a slower rate than for the normal
product code.) Cycle the power or perform the watchdog test to exit the Backdoor Test mode.
10.1. “Backdoor” Tests
When entering the backdoor test mode, the MJ-X runs automatic checks and displays diagnostic messages
if appropriate. The MJ-X displays: "Test Code XXXXXX", where XXXXX is the backdoor test date code.
Keypad Test
Set the Remote/Auto/Manual (“R/A/M”) switch to Remote or Manual. Press any key. The MJ-X displays
the key’s name. Press the same key multiple times. The MJ-X alternately displays the key name and a
blank screen.
Remote/Auto/Manual Test
Toggle the Remote/Auto/Manual switch. The MJ-X displays the active switch position. For “AL” series
MJ-X units only: With the R/A/M switch in the Manual position, toggle the Tap Raise/Lower switch. The
MJ-X displays the Tap Raise/Lower switch position.
Indicator LEDs Test
Set Remote/Auto/Manual (“R/A/M”) switch to Manual. Set Tap Raise/Lower switch to Lower. The
Overlay LEDs (except Alert) turn on sequentially from top to bottom. The Alert LED blinks
independently at a regular rate. [This test may not always work. Use the Power-on LED test as a
substitute.]
Neutral Sense
Short the Neutralite signal (jack plug U12) to “E”. The MJ-X displays "Neutral Pos ON". Remove the
“E” ground connection. The MJ-X displays "Neutral Pos OFF".
Operations Counter Sense
Short the Operations Counter signal (jack plug U10) to “E”. The MJ-X displays: "Op Counter ON".
Remove the “E” ground connection. The MJ-X displays "Op Counter OFF".
VRC1(2) and Auto Inhibit Sense Test
Short the VRC1(2) terminals. The MJ-X displays "VRC En1(2) ON". Remove the short. The MJ-X
displays "VRC En1(2) OFF". Short the Auto Inhibit terminals. The MJ-X displays " Auto Inh ON".
Remove the short. The MJ-X displays " Auto Inh OFF".
Display Test
[Set the Remote/Auto/Manual switch to Auto. Press the Bandwidth key.] Turns on all segments, writes
test screens, changes brightness, then blanks the character display. This test continues until the
Bandwidth key is pressed again or some other key is pressed.
Speaker Test
[Set the Remote/Auto/Manual switch to Auto. Press the Voltage Level key.]
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