Turn the unit on and open the lid or top cover. 2. Remove the ink cartridge from the franking machine. 3. Using a clean, dry lint-free cloth or the alcohol wipe supplied or a rubber clean, rub the cartridge contacts from the top to the bottom. The contact area of the cartridge should be rubbed briskly to clean the gold contacts. Ensure that you wipe your finger over the corresponding gold pins inside the franking machine to ensure no ink is on them. 4. Re-insert the cartridges and close the franking machines top cover. 5. Print a test page. If the problem persists, please contact Mailcoms via the details below.