My mge 1500 ups is indicating fault behind with an led flashing red and there is no output from the ups with or without ac input

where did you find this old UPS> ? I'd bet cash it did not just fail 14 years online TODAY.!?
Redux1 this is way too long but there are many sub models of PULSAR and non told yet. by you.
nor if TOWER OR RACK MODEL is your? wow. that. ? not the same batteries at all in both ever.
did not read your manual first.

14 YEARS old it is, and now owned by APC.com (a 2007 event)wiki it.
The HIGH DC means the Charger output is too high
or the 36v 3 battery loop is broken (no load equals charge voltage is too high DC bus)
if you have rack UPS and use 12vdc batteries, in it (not 6vdc as it must) the DC bus will be too high.
UPS is complex and more so not telling full model numbers of it and photo of if.



the LIST OF what can be wrong, (besides bad PCB inside)
wrong batteries, used, or connected wrong.
battery terms rusty. or just loose.
EXB option was enabled before (14 years ago?) and not reconfigured now that it is gone. now.
battery breaker rear tripped. in inside batteries and if EXB option the outside battery breaker tripped. on it.
wire backwards is prevented with connector keys, but if hacked , any thing is possible wrong,.
no photos of yours, the DC bus is 36vdc on the tower. 3x12=36v


AC LINE IN CAN BE SET 100VAC TO 480VAC, (TO COVER WORLD POWER USED)
if not configured day1, correctly there is no hope, only smoke.
what AC voltage is your country, (at home are you) and freqency, 50 or 60HZ, (most are auto set for Hz)


MGE is nOT MEG. at all. sorry but typos like that make help super hard.


just one of many 1500, I can not guess what your REALLY is, Pulsar has many sub models.

https://www.manualslib.com/manual/821986/Mge-Ups-Systems-Pulsar-Extreme-1500.html?page=1#manual


MGE is now owned by APC for 14 years today, UPS company (a top maker)
and this model is not supported now it is too old,,, found in garage sail for $1 USD, I'd pass on that.

and APC does not support this very very old UPS now. they chose not to support it, but gee call them and ask.
Apc.com, click support , and contact them.

next time post photos of front and rear.
and full model number not just "Pulsar 1500," shortened like that. and MGE not MEG.
and what country you live and if at home or using commercial power , 100v or 480vac or what. LINE POWER.?
last , is , if you buy a used UPS outside of your country it will be wrong AC input line voltage. and must be cured first. by strapping or configuration settings,

I have never seen any UPS made that works in all countries, and the few that do many, must be strapped first.
how that is done is covered in every UPS MANUAL made, in the world.
if done wrong this test step, you will get smoke or worse fire. (only fuse can save you from that done wrong)
never bypass fuses OK
and if doing other hacks say so, tell the hacks , like using the wrong batteries.

Unplug the inverter, and have the outlet tested. After being unplugged for a while, the inverter should reset when it is plugged into a grounded outlet.

bad batteries. how old are they

replace capacitor c014 with a new 47 uf one, this fixed mine - for pulsar el4 and ES4 - see messageboard here https://groups.google.com/forum/#!topic/fr.sci.electronique/Jq_WQMpl8QI

Hello,

In attempts to get your IN15 projector working, please try the steps below.

Disconnect AC power from the projector and wait for 10 seconds for supply to properly discharge.

While holding down the Menu, Select and Input buttons simultaneously, plug in the main AC power until

the LEDS stop flashing (approximately 7 seconds)

1. Four beeps every 30seconds (On Battery LED will be illuminated)
This alarm indicates that the Battery PowerSupplied outlets are now supplying battery power as opposed to power from theutility. If the UPS determines that the input utility power is unsafe for yourcomputer equipment, the UPS will switch to battery power.
Note: Ifthe power disturbance is brief, you may only hear one or two beeps.

2. Continuous Beeping (On Battery LED will beilluminated)
This alarm indicates that a Low Batterycondition has been reached and that the UPS will soon shutdown. Once the UPStransfers to On Battery operation, it can only stay on battery for a limitedamount of time. The UPS will sound this alarm about two minutes before thebatteries are totally exhausted. Once exhausted, the UPS will shutdown and turnoff its output power to your equipment. If you hear this tone you shouldimmediately shutdown your computer to prevent data loss or corruption.

3. Continuous Beeps for 30 seconds (BackUPS OFFICE 250 and 280 ONLY)
This alarm indicates the unit has detected anOverload condition after it has performed a self-test during start-up.

4. Continuous Two-Tone Beep
This alarm indicates a severe Overload wasdetected while the unit was on-battery operation. This tone will continue tosound until the unit shuts down.

5. Continuous Tone (On Battery LED will beflashing)
This alarm indicates that the battery-poweredoutlets are overloaded.

6. Continuous Tone (On Line and On BatteryLEDs flashing) Back UPS OFFICE 350,400, and 500 ONLY
This alarm indicates that an internal UPS faulthas occurred.

Please remove and clean the Battery terminals of the Notebook, make sure that the LED power indicator of the AC Adapter is glowing and output pin of the AC Adapter is properly connected to the notebook. The fault might be either with the output pin of the AC Adapter or Input DC socket of the Notebook. If the LED Power indicator of the AC Adapter is not glowing then the AC Adapter is not working and requires replacement. If the AC Adapter is working then please remove the Battery and turn on the Notebook by directly connecting to the AC Adapter. If the issue still persists, then it might be hardware issue of the Notebook and Service might be required. Please contact the manufacturer to initiate the service.

http://www.retrevo.com/support/QSC-RMX-4050HD-Amps-manual/id/23107ci658/t/2/

Page 7...

CLIP: red, to the left of each Gain control.

Normal indication: illuminates whenever the amplifier is driven beyond full power. The LED's brightness indicates the amount of distortion. Distortion that causes only brief flashing may not be audible.

During muting, the indicator fully illuminates. This occurs during normal "On-Off" muting.

Abnormal indication:

•Bright red illumination while the amp is being used indicates either thermal muting or a shorted output.

•If the amplifier overheats, the fan will run at full speed, and operation should resume within one minute. Allow the fan to run, and make sure the amplifier ventilation is adequate.

•A shorted or overloaded output circuit will cause excessive Clip flashing and possible overheating.

•If distortion is audible without a Clip indication, the problem is either before or after the amplifier. Check for damaged speakers or overloaded signal source. The amplifier Gain control should be in the upper half of its range to prevent input overload.

did you get this fixed

I believe that the actual unit may have other problems and that you will need a schematic to aid in your troubleshooting of this issue. Once you have the schematic and a multiment you can check the voltages to see if things ar as they should be and then we can look at what is happening.