CNC Controls and Electronics Diagnostics and Repair
CNC control and electronics faults stop production fast. MMS technicians diagnose and repair them on-site across Fanuc, HEIDENHAIN, and Siemens platforms.
We handle control and electronics faults on Kellenberger, Palmary, Jones & Shipman, Hardinge, Supertec, Studer, Hauser, and other CNC grinding machines. Our expertise covers the Fanuc, HEIDENHAIN, and Siemens platforms running most precision grinders in North America.
We routinely resolve servo and control alarms, restore hard drives, and trace intermittent wiring faults causing machine alarms. When your machine will not boot up, has servo or control alarms, or throws persistent communication errors, we follow proven diagnostic routines.
Symptoms we resolve every week
Machine that boots but does not reference home, or fails to reference one axis.
Persistent Profibus or sercos communication alarms after an upgrade or component swap.
Servo drive faults that clear and return: thermal, position error, or following error.
Battery-backed memory loss after a long shutdown, with parameters or part programs gone.
Linear scale or encoder alarms intermittent at temperature.
Scope of work
- Alarm diagnosis and resolution
- PLC troubleshooting and ladder logic diagnostics
- Parameter adjustment if needed
- Home position reset and axis referencing
- Fuse, battery, and power supply replacement
- Control PC, hard drive, and EPROM replacement
- Wiring inspection, repair, or replacement
- Servo drive diagnostics and drive board exchange
- SRAM backup and data restoration
- Connection and communication fault resolution
- Scale and encoder communication diagnostics (Fanuc encoders, HEIDENHAIN linear scales and encoders)
Machines and brands covered
We have hands-on experience on the following platforms (this is not an exhaustive list):
Frequently asked questions
Can you back up a control before parts are replaced?
Yes, and it is part of our standard procedure. SRAM, parameters, PLC ladder, and part programs are backed up before any control work where data could be at risk.
Do you keep refurb stock for old Fanuc and Siemens boards?
For the most common drives and control boards, yes. For unusual platforms we source through our supplier network or arrange a board-level repair with turnaround in days, not weeks.
Request this service
Tell us the machine and what is happening. We will route it to the right field technician.
Control alarm stopping production?
Two-hour response during business hours. Send the alarm code and machine details.