MEDRAD Salient: injector head Wi-Fi link to tablet fails to initialize
What happened
The injector reported error 35, and the wireless link between the head unit and the tablet never came up — no network initialization.
What was checked
- The engineers first matched the Wi-Fi type, network name and channel settings between the head unit and the tablet.
- They scanned with a laptop and a phone to see whether the network with the tablet's name was actually broadcasting.
- When the network was missing, they swapped the USB Wi-Fi adapter with an external antenna on the tablet.
- On the Wi-Fi board of the head unit they checked resistor R3 and measured the supply at pin 33 of the WizFi210 module — in this case the 3.3 V rail was dead.
Cause
In this case the engineers found the WizFi210 module damaged by an electrostatic discharge: the 3.3 V supply was absent and the module showed a near short to ground on the board.
What was done
The WizFi210 module was replaced: the old one was removed from the Wi-Fi board with hot air and a new module soldered in. The fault cleared and the injector returned to service, as reported in the case.
Safety
Disconnect the injector from mains power before opening the head unit, use ESD protection when handling the board, and complete electrical safety testing before returning the injector to clinical use.
Lesson: When a wireless link fails, verify the network settings and the broadcast side first, then measure the module's supply — a missing rail with a near-short points to a damaged module, and ESD discipline prevents exactly this kind of failure.
Covered in the course: Fault-Finding Method for Medical Equipment →
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.