We have a cannon mg3550 Pinter with the error code flashing twice

Sure - but you need to find out what the new error codes stand for and be guided accordingly. You might want to check on the Sharp web site.
Your t con board might also have gone south.

http://www.usa.canon.com/cusa/page.action?pageKeyCode=searchResults

Try this link:

http://kbsupport.cusa.canon.com/system/selfservice.controller?CONFIGURATION=1011&PARTITION_ID=1&secureFlag=false&TIMEZONE_OFFSET=&CMD=VIEW_ARTICLE&ARTICLE_ID=13963

The printers first error code show all lights flashing:
Flashing Ready'Data
Flashing Toner Low
Flashing Load'Remove Paper
Flashing Paper Jam
Flashing Error
Flashing Press Continue
By pressing continue twice to get to second error codes the lights show:
Flashing Ready'Data
Off Toner Low
Flashing Load'Remove Paper
Flashing Paper Jam
Flashing Error
Flashing Press Continue
Pressing continue twice more shows:
Off Ready'Data
Flashing Toner Low
Off Load'Remove Paper
Off Paper Jam
Off Error
Off Press Continue
Pressing continue twice more brings back to all lights flashing
The computers ( I have tired more than one with diff USB and A parallel cables) do not see the printer as being attached. My toner is half full. I checked the internal power board in base of printer and the fuse is good. The error should not have anything to do with being connected to a computer or not because when it was working and not connect to a computer it would not blink all the indicator lights (If I remember correctly, just the Press Continue light would be lite).
Information I have found so far:

1. http://support.dell.com/support/edocs/systems/p1500/en/index.htm#online_documentation

o Under PDF Documents Owner's Manual(English) (.pdf) (1.33 MB) shows very little about the indicator lights.
o Under HTML Documents User's Guide shows more information about the indicator lights but mentions nothing about the secondary error codes.

1. The Lexmark E321/E323/E220 are very close cousins to the P1500 and on Lexmark's website the manuals have more info on secondary codes but nothing that matches my error.

• Lexmark E220 User's Reference Starts on Page 45 Secondary codes start on Page 47
• Lexmark E321, E323 User's Reference Starts on Page 47 Secondary codes start on Page 49

Information I am guessing could be the problem:

1. The fuser has gone out (need to know how to check) Why else would they sell the fuser if it didn't go out regularly Part Number: 56P1053
2. Clutch Assembly I'm not sure of the accuracy of the info on this page.

Try resetting the printer:

1 - power off.
2 - hold stop/reset ,hold ON/OFF
3 - release stop/reset, push stop/reset twice, quickly, then release ON/OFF
4 - wait untill LCD display shows "Canon Idle",then push stop/reset four times, quickly
5 - then push power twice, quickly
6 - power off and power on.

hi i hope it works

try these Procedure

Reset Cannon Mp170 Reset

view full content : http://ccabong26.blogspot.com/2011/12/reset-canon-mp170-printer-model.html

Hi
Error 6A00
The 6A00 is a Canon generic code for paper path jam.

Solution 1:
Move the printhead carriage back and forth a few times.

Solution 2:
Check the purge unit: Moving the print head assembly will not clear a purge unit if its jammed with paper, paper clips, push pins, screws, cookie crisp, flower bud pods or the like.

Solution 3:
Press the ink pads down in the purge unit.

All I ask is please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

press and hold the power button until it stops flashing - the printer is simply trying to tell you that there was an issue (out of ink, out of paper, or paper jam) and is trying to resume normal activity.

solution pour l'erreur COF32 pour konica minolta 163

Your printer is telling you it has an operating error, many printers give flashing lights as error codes to tell you what is wrong. If you visit the cannon website for your area, they will be able to tell you exact error code. If you do not want to do this, give me some time and i will be happy to help by finding the error for you. To help me, post back with what your printer is or is not doing correctly to get the error in the firts place. lilacgerry