Troubleshooting
Signs Your EMG System Needs Repair
Most EMG system failures don't happen all at once. They announce themselves first, usually as small inconsistencies that are easy to write off as “just this patient” or “probably the electrode.” But those early signals are exactly the moment to act. Catching a problem while it's still minor is the difference between a quick fix and a system that's down during a fully booked clinic day.
Here are the warning signs worth taking seriously.
1. Noise that won't go away
Some baseline noise is normal and usually traces back to electrodes or the environment. The red flag is noise that persists after you've swapped electrodes, checked connections, and ruled out interference. Consistent, unexplained noise in your recordings often points to a problem in the amplifier, preamplifier, or cabling inside the system itself.
2. A weak, erratic, or absent stimulus
The stimulator is central to nerve conduction studies, and it's a common failure point. Watch for a stimulus that feels weaker than it should, output that varies from one run to the next, or a stimulator that intermittently delivers nothing at all. Because NCS results depend on a precise, repeatable pulse, a failing stimulator directly threatens the accuracy of your studies.
3. Channels dropping out or reading incorrectly
If a channel goes dead, reads erratically, or doesn't match what you'd expect from a known-good setup, and the issue follows the system rather than the patient or the electrode, the fault is likely internal. Intermittent channel problems are especially worth chasing down early, because they tend to get worse.
4. Signal that won't calibrate
When a system can no longer pass its calibration check or hold calibration between sessions, you can no longer fully trust its measurements. This is not a “keep using it and see” situation — it's a clear call for service.
5. Recurring software crashes, freezes, or errors
Hardware isn't the only thing that fails. A system that repeatedly freezes mid-study, throws errors that won't clear, or won't reliably save data needs attention. These problems can stem from software, storage, or aging components, and they put patient data at risk.
6. Physical and connector damage
Bent connector pins, cracked housings, loose ports, and frayed cabling all degrade signal quality and can worsen quickly. Visible damage to the inputs or chassis is a straightforward reason to have the system inspected.
7. Aging or unsupported hardware
Sometimes the warning sign is the calendar. Legacy components — floppy drives, obsolete media, parts the original manufacturer no longer supports — are a liability waiting to happen. When Cadwell dropped service and repair for the Sierra Wave and Wedge models, those systems didn't stop being repairable; they just needed a partner who still supports them. Planning ahead beats scrambling after a failure.
Why early action saves money
Every one of these signs gets more expensive the longer it's ignored. A worn stimulator caught early is a targeted repair; ignored, it can take down a study schedule. Intermittent noise diagnosed now is far cheaper than the repeat studies and lost clinic time it causes later. The pattern is consistent across neurodiagnostic equipment: small problems are cheap, and downtime is not.
Get it checked by people who know the platform
If you're noticing any of these signs, don't wait for the system to fail completely. AdmarNeuro has repaired EMG, NCS, and EEG instruments since 1984, with service handled directly by experienced biomedical engineers — including base repairs, stimulator and preamplifier repairs, and the USB upgrade that replaces the legacy floppy drive on Neuromax 1002/1004 units. We acknowledge service inquiries within 24 hours and complete most standard repairs within 72 hours of receipt.
