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Key Technical Specifications
Since public datasheets for this exact part are unavailable, the specs below are based on the Motorola MVME family pattern and similar industrial PCB cards:
- Manufacturer: Motorola (Motorola Solutions / Motorola Embedded Computing)
- Primary Part Number: 01-W3950B 04B
- Secondary Part Number: 84-W8950B01D
- FAB Revision: A
- Board Type: Industrial PCB / embedded controller card
- Likely Bus Standard: VMEbus (based on MVME series naming)
- Application: Industrial automation, telecom, semiconductor equipment, or robot controller cabinets
- Typical Form Factor: VME card (6U or 3U, depending on series)
- Condition: Surplus; typically used or removed from service
- Availability: Very limited; check multiple surplus vendors
Product Introduction
Motorola 01-W3950B 04B (84-W8950B01D, FAB REV A) is an industrial PCB card, most likely part of the Motorola MVME embedded controller family used in VMEbus-based control systems. It appears in industrial automation, telecom, and semiconductor equipment applications
This board is typically sourced as surplus for repair or restoration of legacy control cabinets. The exact function depends on the host system, but MVME-style cards commonly serve as CPU, I/O, communications, or signal-processing boards. Buyers usually search by all identifiers (01-W3950B 04B, 84-W8950B01D, FAB REV A) to ensure exact match.
- 01-W3950B 04B 84-W8950B01D FAB REV A
- 01-W3950B 04B 84-W8950B01D FAB REV A
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| System will not boot | Board fault or poor backplane seating | ✅ High | Power down, reseat board, inspect backplane connectors and pins | Replace if boot failure follows the board |
| Random resets or lockups | Internal component failure or power instability | ✅ High | Measure supply rails (5 V, ±12 V, etc.), check for thermal issues | Verify power quality, then replace if issue persists |
| No communication on bus | VMEbus interface or firmware fault | ✅ High | Check bus termination, master/slave config, and bus LEDs | Replace if communication test fails with known-good backplane |
| Board overheats | Internal short or failed component | ✅ High | Thermal check after power-up; compare against known-good unit | Pull from service and replace immediately |
| Physical damage or burn marks | Electrical fault or prior failure event | ✅ High | Visual inspection under bright light, check for charred areas | Do not reinstall; replace immediately |
| Intermittent errors | Contamination or connector corrosion | ✅ Medium | Clean connectors, inspect for corrosion, retest under load | Clean and retest; replace if errors continue |
If you are stuck, contact technical support with photos of the board, system LEDs, and any alarm logs.
Frequently Asked Questions
Q: Is 01-W3950B 04B a direct replacement for my existing board?
A: Only if your system uses the exact same Motorola part number, secondary ID (84-W8950B01D), and FAB revision (A). Small revision differences can cause boot or communication failures.
Q: Is this part new or used?
A: This model is typically sold as surplus or tested used stock, not factory new. That is normal for older Motorola embedded controller boards, and pricing is lower because supply is limited and the part is obsolete.
Q: Can I hot-swap this board?
A: No. These VMEbus-style boards are not hot-swappable unless the OEM manual explicitly allows it. Power down before removal or installation.
Q: Will this fix a system that will not boot?
A: Maybe. A bad power supply, backplane, or master controller can look the same. Check supply rails, reseat the board, and confirm the fault follows the part before replacing it.
Q: Do I need to reprogram the board after replacement?
A: It depends on the board function. If it’s a CPU or communications controller, firmware and configuration may need to match the rest of the system. Always back up existing config before swapping.
Q: Why is this cheaper than OEM factory stock?
A: Because it is surplus, pulled from service, or tested used stock. The lower price reflects availability, not necessarily lower quality.
Q: What should I verify before ordering?
A: Match the primary part number (01-W3950B 04B), secondary ID (84-W8950B01D), FAB revision (A), and the physical board layout. A small mismatch here can stop the system from booting or communicating correctly.
