ProScan 7000: no COM-port communication with the generator
What happened
The workstation would not talk to the X-ray generator over the COM port. Changing the COM-port number and moving the cable to other connectors on the computer did not help, a port conflict was suspected, and the computer's COM ports had reportedly been failing repeatedly.
What was checked
- Changed the COM-port number in the software to rule out a conflict on the computer side.
- Moved the cable to other serial connectors on the computer to see whether the fault followed the port or stayed with the line.
- Checked the RS-232 line driver (MAX232 type) on the generator side, since repeated burnout of computer ports pointed to the line rather than to settings.
Cause
In this case the engineers found a failed RS-232 line driver IC (MAX232 type) on the generator side. A shorted driver can put abnormal voltage levels onto the serial line, which fits with the computer's COM ports being damaged as well.
The cause is probable and was not fully confirmed.
What was done
The reported fix was to replace the MAX232 driver IC on the generator's interface board and fit the new IC in a socket, so any future replacement does not need soldering. In this case this was considered the probable fix for the lost communication.
Safety
De-energise the generator and verify that internal capacitors are discharged before touching the interface board, and complete the manufacturer's electrical safety checks before the system is returned to clinical use.
Lesson: When a computer's serial ports keep dying on one machine, suspect the remote line driver on the equipment side before blaming port settings or the PC itself.
Covered in the course: X-ray Service — Level 2: Fault-Finding →
Written from an anonymised case shared by service engineers. It is not a manufacturer instruction and grants no authorisation. Independent note; names are trademarks of their owners.