Maintenance Required Code #7

Error Code #7 is a Communication Fault generated from the Main PCB. There is a communicaton processor on the Main PCB which communicates with the Front End PCB. The Front End PCB is a common failure and easy to swap out. I would swap that out first and see what happens. The Front End PCB is the same in the CS-300, CS-100 and 98XT. Its also used in other Datascope products. If its not the front end PCB, it could be another board, but more then likely it will be the Main PCB.