Challenge
Original design engineer had departed and only a test requirements checklist remained; A universal test system compatible with multiple control boards was needed urgently
Test System Rebuild with Incomplete Documentation
Delivered a universal test system compatible with multiple control boards for an in-vitro diagnostics client under incomplete documentation conditions
Ledge Approach
Analyzed interface behavior and rebuilt the test logic, independently completed hardware design (power system, command simulation, signal acquisition), iterated firmware through multiple versions, and developed PC software in parallel
Result
Delivered in under three months; one test system supports multiple control boards; Client continues to choose Ledge for new projects
Delivered a universal test system compatible with multiple control boards for an in-vitro diagnostics client under incomplete documentation conditions
01
Project Background
The customer needed a universal test system for multiple control boards, but the original project engineer had left and only a test requirements checklist was available; The goal was to restore test capability quickly enough to support production and validation
- The customer is in the IVD sector, with strict test reliability expectations
- The system had to support multiple control boards, not one isolated fixture
- Hardware, firmware, and PC software needed to move in parallel
02
Key Challenge
Incomplete documentation meant the project could not be developed by simply following an existing design package; Ledge had to analyze interface behavior from the test goals, rebuild test logic, and preserve compatibility across several boards
- Original engineering documentation was incomplete
- Interface differences across multiple control boards had to be normalized
- The system had to cover power, command simulation, signal acquisition, and software interaction
03
Ledge Approach
Ledge started from the test requirements and interface behavior, decomposed test actions and signal paths, then developed test hardware, firmware, and PC software together; Multiple firmware iterations turned uncertain interface behavior into a stable test routine
- Analyzed interface behavior and rebuilt the test logic
- Designed hardware modules for power, command simulation, and signal acquisition
- Developed PC software in parallel while firmware iterations improved compatibility
04
Result and Value
Ledge delivered in under three months, and one test system now supports multiple control boards; The project restored a practical production and validation capability, not just a one-off fixture
- Moved from a one-off fixture mindset to a multi-board compatible platform
- Restored customer production validation capability under incomplete information
- Reduced coordination burden by delivering hardware, firmware, and PC software together
05
Capabilities Proven
- Test system development
- Interface behavior analysis and test logic reconstruction
- Hardware, firmware, and PC software delivery
- Medical and IVD project support
- Productization support from problem to producible capability
- High-cooperation engineering collaboration