How can I fix a videojet printer... it says cannot start jet ink core service overdue

It means the ink supply has 2% remaining and will have to be replaced

here is a service manual
http://representacionesindustriales.net/manuales/videojet/43s/tecnico/43S_Service_Manual_1.pdf

Epson printer blinking different lights. The different lights blinking has different meaning and solutions. When the Epson printer red light blinking that means ink cartridge of your printer is out of ink. And when your printer green light blinking that means paper gets jammed inside the printer.

You can fix the Epson printer lights blinking error using following steps:

·Fix the paper jammed
·Check empty or damaged ink cartridge
·Clean the dirty print head or replace missing or failed print head

·Read the steps to fix the Epson printer lights blinking error.

Have you removed the plastic covering the ink jets on a new cartridge?

Most probably you need to clean the ink jets.
Go to the Control Panel,
Go to Printers and Faxes
Right click on your printer
Choose printer preferences
Go to services or maintenance and choose either "service this device" or "clean the ink jets"

Canon MP750, MP760, MP780, MP830

The Unset mistake:
##341. Maintenance jet waste ink capacity full
##342. Cleaning absorption waste ink capacity full
##343. Ink detection waste ink capacity full

1. Include the printer.

2. Press button Menu , then Scan , Copy and once again Scan (entry in service mode, on дисплее will appear #1 SSSW)

3. The Arrow to choose 7. Printer test , press Ok .

4. The Arrow to choose 5. Ink abs capa , press Ok , install importance 0 .

5. Switch off the printer.

if it isn't broken, don't fix it. I would leave well enough alone until the printer starts giving you trouble.

Dear budg,
Error code 5600 in S200 is No Print head Error indicator. In this case, the print head of the printer is faulty so that the printer cannot detect the print head. About the print out, please check if there is enough ink in ink tank to print. If there is enough ink to print, means this bad print out caused by the faulty print head. It seems that you to replace the print head.
Regards,

Compass Micro, Inc.
(503)408-8725 or (800)388-8595 Micrologic Systems, Inc. (903)561-0007 National Parts Depot (845)469-4800 or (800)524-8338 TSAworld, Inc. (770)417-2323 or (800)633-6626 Vance Baldwin Electronics (954)723-9191 or (800)432-8542
You can get replacement parts from any one of these.

or you can get it fixed at any Epson Authorized Servicer

http://pos.epson.com/service/SCR.htm