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Key Technical Specifications
- Processor: MC68040
- CPU Speed: 25 MHz
- Cache: 8 KB on-chip cache
- Memory: 8 MB DRAM
- SRAM: 512 KB battery-backed SRAM
- Flash: 1 MB onboard flash memory
- VME Interface: A32/D64 master/slave with system controller support
- Expansion: 4 IndustryPack slots
- Communications: Ethernet and two serial ports
- Form Factor: 6U VME single-board computer
Product Introduction
Motorola MVME162-042 is a 6U VME single-board computer built around a 25 MHz MC68040 processor with 8 MB DRAM. It is used in legacy industrial control, test systems, and OEM VME racks where exact board fit and bus behavior matter.
This board is selected when the site needs Ethernet, serial I/O, and IndustryPack expansion in a proven VME form factor. The onboard flash, battery-backed SRAM, and system-controller-capable VME interface make it a common replacement for older Motorola-based automation platforms.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs on power-up | Rack power, not CPU failure | ❌ Low | Measure backplane rails at the slot: +5 V, +12 V, -12 V | Verify PSU and backplane fuses before replacing the board |
| Board boots to monitor but not application | Corrupt flash, bad boot image, or wrong configuration | ✅ High | Connect to serial console and check 162Bug output | Reflash or restore the correct image before condemning hardware |
| Ethernet link absent | Cable issue, transceiver mismatch, or damaged PHY section | ✅ Medium | Check link LED and test with a known-good cable and switch port | Confirm the network option and physical interface revision |
| Serial console shows unreadable characters | Baud rate or terminal setting mismatch | ✅ Medium | Verify terminal speed, parity, and stop bits | Match the original site settings exactly |
| IP modules not recognized | Bad IP card, slot issue, or missing power on carrier | ✅ Medium | Reseat the IP module and check voltages on the IP carrier | Inspect carrier wiring and slot configuration |
| Random resets after warm-up | Battery failure, thermal stress, or unstable supply | ✅ Medium | Check battery voltage, airflow, and rail ripple | Replace the battery and verify cooling before hardware swap |
Contact technical support with photos of the board, jumper settings, console output, and rack details if the fault is still unclear.
- MVME162-042
Frequently Asked Questions
Q: Is MVME162-042 a direct replacement for every MVME162 board?
A: No. It is a specific configuration of the MVME162 family, and compatibility depends on CPU option, memory size, Ethernet presence, and installed IP hardware. Match the exact suffix and board revision before ordering.
Q: Can I hot-swap this board?
A: No. Power down the rack first. Legacy VME CPU boards were not meant to be pulled live, and doing so can stress the backplane or corrupt attached hardware.
Q: Will my existing software run on it?
A: Often yes, if the boot ROM, memory map, serial settings, and IP hardware match the old board. The real risk is configuration drift, not just CPU compatibility.
Q: Why is this cheaper than factory-new hardware?
A: Because MVME162-042 is an obsolete legacy part. Units in the market are usually surplus, pulled from service, or refurbished, so pricing reflects availability, age, and test status rather than current production.
Q: What condition should I expect?
A: Most sellers list it as New Surplus or Refurbished and tested. Ask for the test report, serial number, and actual photos, not just a stock image.
Q: What are the common failure points?
A: Battery-backed SRAM loss, bad flash contents, aged electrolytic capacitors, and network or serial configuration errors. In the field, many “bad board” calls turn out to be power, jumper, or software issues.
Q: What warranty is realistic for a board like this?
A: Limited warranty is normal for surplus industrial electronics, often 30 to 365 days depending on seller policy and test depth. Get the warranty terms in writing before you commit.
