Flashing lights My one month old printer is indicating that I need to replace a cartridge with the appropriate flashing light. The light above it is also flashing, which I believe shows a paper blockage. Thirdly, the power light is off. Can't find any evidence of a blockage. Can't replace the cartridge because the carriage will not move to the central position so that the cartridge can be removed, although it goes through the motions - i.e. Moves slowly from left to right.

HP LaserJet 2550L Printer panel indicates 4 LED's for 4 toner cartridges, 1LED for the Drum unit. one LED for the power on button. one of the cartridges or the Drum unit has a problem, it indicates from the lights shows on or flashing. By referring to the indication lights you can diagnose the problem contains in one of the cartridges or the drum unit. By replacing the appropriate item you'll be able to make the printer to the working condition.

check the old cartridge was empty or it was just showing wrong indication.( flashing ).

See printer status monitor. Replace the appropriate cartridge. Flashing 5 times means colour cartridge not recognized , 7 times is black cartridge.

Filter Replacement
Filter Replacement Indicator:
Your Defender® is equipped with a Filter Replacement Indicator located on the front
panel. Anytime this red indicator flashes, it is recommended that you call your authorized
FILTERQUEEN® Distributor to order a replacement filter. Anytime this red indicator stops
flashing and remains solidly illuminated, it is recommended that you change your filter. To
receive full benefit from your Defender® and to extend your warranty, it is strongly
recommended that you follow the filter replacement schedule suggested above. Under higher
pollution levels, your filters will need to be replaced more frequently.
The Filter Replacement Indicator is operated by filter time in use and is controlled by an
onboard timer. After 11 months of time in use of your Medi-Filter® Cartridge, the Filter
Replacement Indicator will begin to flash. It will continue to flash until the you reach 12
months of time in use, at which time the Filter Replacement Indicator will stop flashing
and remain solidly illuminated.
After replacement of your Medi-Filter® Cartridge, you must reset the Filter
Replacement Indicator's timer. When the timer has been properly reset, the Filter
Replacement Indicator will turn off.
Resetting the Filter Replacement Indicator Timer:
After replacement of your Medi-Filter® Cartridge per the instructions found on page 7, the
Filter Replacement Indicator's timer can be reset by performing the following sequence of
steps:
1 Plug unit into outlet.
2 Press power On/Off switch to the On ("I") position.
3 Allow unit to start running at low speed.
4 PRESS and HOLD both the Up and Down arrow buttons until the Filter
Replacement Indicator starts to blink.
5 Release both the Up and Down arrow buttons.
6 While the Filter Replacement Indicator is still flashing*, again PRESS and
HOLD both the Up and Down arrow buttons until the Filter Replacement
Indicator turns off.
If the steps above have been performed properly, the Filter Replacement Indicator will
turn off and not flash again for 11 months. If the Filter Replacement Indicator remains
on, repeat the steps again.
*Note that in step 6 above, the Filter Replacement Indicator MUST still be flashing when
the buttons are pressed the second time. The Filter Replacement Indicator will continue
to flash for approximately 3 seconds after the buttons are released as required in step 5 above.
Note: Under higher pollution levels, your filters will need to be replaced more frequently.
Note: To order replacement filters, call your authorized FILTERQUEEN® Distributor, or call
1-440-846-7800 for the Distributor nearest you.

http://www.filterqueen.com/pdf/defender.pdf

Flashing resume light also can mean:

1. cartridge is missing or an incorrect print cartridge is installed
2. cartridge is out of ink
3. dirty cartridge contacts
4. paper jammed

Check are cartridges firmly snapped into place and not empty. Use water to wash copper on cartridges if contacts are dirty.

If the light is flashing no matter the speed, remove the cartridge and inspect it. If it is low you may still be able to print some more, but if it's small ink well is empty you will not be able to print even in black only until you replace the cartridge. Hope this helps.

The yellow-print-cartridge
light is blinking, and the
printer stops printing.

The print cartridge is
empty or missing.

The printer cannot
detect the print
cartridge correctly.
1. Reinsert or replace the print cartridge.
2. If the print-cartridge light is still blinking but the
Attention light is not on, turn the printer off and
then back on.
3. If the problem persists, repeat the above steps
with yellow print cartridges until the error is
resolved.
4. If the problem persists, replace the printcartridge
E-label reader, which is located on the
pressure assembly of the print-cartridge
carousel.

Here is the indicator light error page from the Service Manual

You will see there is no specific error of "Power flashing" with "Error On". The inference is that the Power light was doing someting to cause it to flash (e.g. jn cartridge change mode) when something went wrong to cause the "power no change" with "red light on" error. The most likely I think is "no cartridge" - or more likely "faulty cartridge looking like no cartridge". Have you tried re-replacing the cartridge with yet another. Other possibilities are some sort of mechanical jam. Please report back on this.

There are some possibilities due to the above phenomena. Let's discuss about it:
1) If the POWER light is flashing green, then your printer is now warming up or performing maintenance procedure (replacing cartridge/tank) or cleaning print head, just wait a few seconds till the light stop flash. Also if the last page of a print job not done, this POWER light flashing green.
2) If the CHARGE/ERROR light is flashing orange with beep 3 times, it mean your cartridge need to be install (especially the 1st time turn on printer) or cartridge being replaced, just install the cartridge and press RESUME to continue.
3) If both POWER light is flashing green and CHARGE/ERROR light is flashing orange with beep 3 times, then your printer may facing a very serious error and maybe need a replacement.

Hope these help.

YBC (/\)

replace the cartridges if the lights are continuisouly flashing. or if there is a pending document in the print que it will flash the lights.delete that pending documents.