Hi, thanks again for the valuble information, i have checked the leads and connections and found CN2 connection on the main board has a defective FFC lock (broken) so the FFC lead was loose have made it good and checked all the test points on the main for resistance all check out ok as per the maintenance spec also checked the slider test points all ok, checked the head test points on the slider with new head connected and they are all OL ? no resistance reading to earth also checked the head earth continuity to the carriage OK, switched back on in maintenance and reset the old head ID with the old head and mem board, then reset the ID for new head with old head and mem board then refit new head and old mem board, still get error 202 device construction on start up go through set up of composition to possible head composition and enter, machine will now attempt to test print but doesnt print, the ERROR 07 has gone, could this still be a firmware issue or possibly the head memory board at fault as the head verification is messed up? thanks for your help with this if you have any more ideas, regards Pete.