Philips Affiniti 30: front acquisition module fault traced to a single board
What happened
The system reported a fault in the front acquisition module; board-level substitution during troubleshooting isolated one failed board inside it.
What was checked
- Swapped the acquisition boards one at a time with a known-good unit of the same model to narrow the fault down.
- Substituted a new front acquisition module as a complete assembly and ran the hardware tests.
- Built different pairs of old and new channel and transducer select boards, ran the full hardware test set nine times as reported in the case, and verified the probes.
- Paired the original channel board with a new transducer select board — in this combination all hardware tests and probes passed.
Cause
The engineers found a failed transducer select board (TSB): with the original channel board in place and only the TSB replaced, the whole front end worked correctly.
What was done
Replaced the TSB as part of the front acquisition module work; after the replacement the full hardware test set passed (nine complete runs as reported) and the probes checked normal.
Safety
Work inside the acquisition module only with the mains disconnected and internal capacitors discharged, observe ESD precautions when handling the boards, and complete the electrical safety check (protective earth and leakage currents) before returning the system to clinical use.
Lesson: When a fault sits inside a multi-board assembly, systematic pair-wise board substitution with a known-good reference is the fastest way to pin down the single failed board.
Covered in the course: Ultrasound 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.