Envelope printing Insists on being manual feed. Printing an envelope, the printer stops, blinking a light until you push a button at which point it prints the envelope. Have tried various settings.

Yes that could be an issue with Printers when you don't use them for a Long time, Please follow the below mentioned Steps:

It insists there is a Cartridge problem on the Printer............ In this Case take out the Paper from the Paper Feed Tray........ Unplug the Power Supply from the Printer.......... Remove both the Cartridges from the Printer.......... Now take a size 10 Envelope fold it so that it should become like a thin long strip........ Now Insert that Envelope on the left side corner of the Printer and move it from right to left and left to right as fast as u can for about 10 times.......... Now Insert the Ordinary Papers onto the Printer and insert both the catridges and Turn on the Printer...... Blinking Stopped...........Issue Resolved....... Still Blinking: Remove both the Cartridges take a Paper Towel turn the catridges direction so that u can see a Copper plate with small boxes on it....... Just wipe it twice or thrice with the Paper Towel.......... Now insert it and Power on the Printer and see whether the Lights are still blinking if it is still blinking...... Contact Lexmark at 1-800-539-6275!!!!!

Good Luck!!!!!

Its not an Issue with the Out of Ink Error: Please try the below mentioned steps and let me know what happens:
It insists there is a Cartridge problem on the Printer............ In this Case take out the Paper from the Paper Feed Tray........ Unplug the Power Supply from the Printer.......... Remove both the Cartridges from the Printer.......... Now take a size 10 Envelope fold it so that it should become like a thin long strip........ Now Insert that Envelope on the left side corner of the Printer and move it from right to left and left to right as fast as u can for about 10 times.......... Now Insert the Ordinary Papers onto the Printer and insert both the catridges and Turn on the Printer...... Blinking Stopped...........Issue Resolved....... Still Blinking: Remove both the Cartridges take a Paper Towel turn the catridges direction so that u can see a Copper plate with small boxes on it....... Just wipe it twice or thrice with the Paper Towel.......... Now insert it and Power on the Printer and see whether the Lights are still blinking if it is still blinking......

Good Luck!!!!!

Xerox WorkCentre envelope printing

Hi. The reasons listed in the manual that cause the LED to flash normally are:

Front cover is open
Close the front cover of the printer.
Back cover is open
Close the back cover of the printer.
Paper jam
Clear the paper jam. See Paper jams and how to clear them on page 6-5.
If the printer does not start printing, press the Go button.
No paper fed manual feed slot
Put the paper in the manual feed slot. See Printing on plain paper, bond paper
or transparencies from the manual feed slot on page 1-10 or Printing on thick
paper, labels and envelopes from the manual feed slot on page 1-13.
Memory full
The printer memory is full and the printer cannot print full pages of a
document. See Solving print problems on page 6-15.
Print overrun
A print overrun occurred and the printer cannot print full pages of a document.
See Solving print problems on page 6-15.
Drum Error
The corona wire needs to be cleaned. See Cleaning the corona wire on page 5-14.

If you check out page 6-5 it tells how to clear the paper jam from the rear of the machine! A point often missed.

Check out the website below if you don’t have a copy of the instruction manual =

http://welcome.solutions.brother.com/BSC/public/files/dlf/doc002089/US_Eur.pdf

If all else fails, try a reset of the printer Drum & Page counter:

1. With printer tuned on.
2. Press and hold the “internal button” behind front cover, until all LEDs illuminate.
3. Make sure Drum light is off, then release and close front cover.

Hope some of this helps………..Please post a response back here and let us all know if it works?............Regards, Cornwellnet (UK)

It insists there is a Cartridge problem on the Printer............  In this Case take out the Paper from the Paper Feed Tray........ Unplug the Power Supply from the Printer.......... Remove both the Cartridges from the Printer.......... Now take a size 10 Envelope fold it so that it should become like a thin long strip........ Now Insert that Envelope on the left side corner of the Printer and move it from right to left and left to right as fast as u can for about 10 times.......... Now Insert the Ordinary Papers onto the Printer and insert both the catridges and Turn on the Printer...... Blinking Stopped...........Issue Resolved....... Still Blinking: Remove both the Cartridges take a Paper Towel turn the catridges direction so that u can see a Copper plate with small boxes on it....... Just wipe it twice or thrice with the Paper Towel.......... Now insert it and Power on the Printer and see whether the Lights are still blinking if it is still blinking...... Contact Lexmark at 1-800-LEXMARK Good Luck.........

In this Case take out the Paper from the Paper Feed Tray........ Unplug the Power Supply from the Printer.......... Remove both the Cartridges from the Printer.......... Now take a size 10 Envelope fold it so that it should become like a thin long strip........ Now Insert that Envelope on the left side corner of the Printer and move it from right to left and left to right as fast as u can for about 10 times.......... Now Insert the Ordinary Papers onto the Printer and insert both the catridges and Turn on the Printer...... Blinking Stopped...........Issue Resolved....... Still Blinking: Remove both the Cartridges take a Paper Towel turn the catridges direction so that u can see a Copper plate with small boxes on it....... Just wipe it twice or thrice with the Paper Towel.......... Now insert it and Power on the Printer and see whether the Lights are still blinking if it is still blinking...... Contact HP at 800-588-3554 and Get the Printer Replaced........ Good Luck

With the address highlighted go to Tools, Envelopes, Custom
Enter the custom envelope size
Pick #4 feed method
click OK

Set the feed tray to hold the envelope along the right side.
Insert the envelope with the flap up - push it all the way in.

Print it

Here is a how-to for the printer, but I'm not sure if you mean the printer, or in a program.
If this is not what you need, let me know.

HP Deskjet 920c and 940c Series Printers - Printing Envelopes


Loading a single envelope Loading multiple envelopes Loading a single envelope Preparing to print

1. Place the envelope, with the flap side on the left and facing up, into the single envelope slot.
2. Push the envelope forward until it stops. See Figure 1.

Figure 1: Inserting the envelope Printing guidelines

• Verify that the Out tray is in the down position.
• Avoid using envelopes that have clasps or windows.
• Avoid using envelopes that are shiny or embossed, envelopes with thick, irregular, or curled edges, or envelopes that are wrinkled, torn, or otherwise damaged.

Loading multiple envelopes Preparing to print

1. Pull out the In tray.
2. Slide out both paper guides and remove all paper from the tray.
3. Place no more than 15 envelopes -- with the flap side on the left and facing up -- in the tray.
4. Push the envelopes forward until they stop.
5. Slide the paper guides snugly against the edges of the envelopes, then push the tray forward until it stops. See Figure 2.

Figure 2: Inserting multiple envelopes Printing the envelopes Each software program is different and requires different steps to successfully print envelopes. For instance, in many versions of MS Word, clicking Tools , and then Envelopes and Labels , accesses the envelope-printing feature. Other software programs will differ from this procedure. Consult the Help menu on a software program or User's Guide for instructions for the particular application. Printing guidelines

• Never place more than 15 envelopes in the In tray at one time.
• Align the envelope edges before inserting them.
• Avoid using envelopes that have clasps or windows.
• Avoid using envelopes that are shiny or embossed, envelopes with thick, irregular, or curled edges, or envelopes that are wrinkled, torn, or otherwise damaged.

Must use Tray 1 bpass to feed labels, on word change media type to envelopes ie page size,paper type and on printer set tray1 paper type to envelopes

On my MP780, be careful to select the appropriate paper type; I was getting black smudges on the left side of my envelopes until I explicitly set that my paper type was "envelope" from "plain paper".  
Another idea is to adjust the "ink drying wait time" to a higher level.