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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Processor | PowerPC 750GX @ 1 GHz |
| Card Power | 30 W typical (+5 VDC & +3.3 VDC) |
| Clock / Memory | RTC with 8 Kbits NVRAM |
| CompactFlash | Industrial grade (FMC-128 or larger) |
| Front Serial Port | 1 × RS-232 (9600–300K baud, maintenance) |
| TMPU Serial Ports | 4 × RS-485 (9600–300K baud, ESD protected) |
| Matching Transition Module | TMPU-1002 |
| Compatible IOCs | IOC-555-S / IOC-555-D (Revision L and later) |
| Operating System | OS 2.14 or later |
| Interchangeability | Fully interchangeable with MCP-1002 |
| Not Compatible With | MPU-750 / TMPU-750 |
4. Product Introduction
The Honeywell MCP-1004 (Compressor Controls Corporation) is the main processor card for Series 5 Vanguard systems used in simplex and duplex compressor control applications. It features a PowerPC 750GX processor running at 1 GHz and draws approximately 30 W from the +5 V and +3.3 V supplies.
The MCP-1004 is functionally identical to the MCP-1002 and uses the same TMPU-1002 transition module. It supports industrial CompactFlash cards and requires OS 2.14 or later. It is not interchangeable with the older MPU-750 processor family; mixing the two in the same chassis can damage the cards. Compatible I/O controllers are IOC-555-S and IOC-555-D at Revision L or higher.
MCP-1004
MCP-1004
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No power / no LEDs | Missing +5 V / +3.3 V supply | ❌ Low | Measure voltages at backplane | Verify power supply and chassis wiring first |
| Processor fails to boot | Corrupted CompactFlash or OS issue | ✅ High | Check CompactFlash presence and OS version ≥ 2.14 | Replace CompactFlash with known-good industrial card |
| Communication loss on RS-485 | TMPU-1002 fault or cabling | ✅ Medium | Inspect TMPU-1002 and RS-485 connections | Verify transition module and cable integrity |
| System will not run with IOC | IOC revision too old | ✅ High | Confirm IOC-555-S/D is Revision L or later | Upgrade IOC to compatible revision |
| Card damage after install | Mixed with MPU-750 | ✅ High | Check for presence of MPU-750 in same chassis | Never mix MCP-100x with MPU-750 family |
| Intermittent resets | Faulty RTC battery or NVRAM | ✅ Medium | Check RTC and battery status | Replace processor if NVRAM fails |
If the fault remains after these checks, provide clear photos of the card label, CompactFlash status, and any diagnostic LEDs or error codes to technical support.
6. Frequently Asked Questions (FAQ)
Q: Are the MCP-1004 and MCP-1002 interchangeable?
A: Yes. They are functionally equivalent and completely interchangeable. Both use the TMPU-1002 transition module.
Q: Can I use this processor with an older MPU-750 system?
A: No. The MCP-1004 is not compatible with the MPU-750 processor or TMPU-750 transition module. Mixing them can damage the cards.
Q: What operating system is required?
A: OS 2.14 or later. Earlier OS versions are not supported.
Q: What CompactFlash card is needed?
A: Industrial-grade CompactFlash, part number FMC-128 or larger. Consumer-grade cards are not recommended.
Q: Which I/O controllers work with the MCP-1004?
A: Simplex IOC-555-S and Duplex IOC-555-D at Revision L and later.
Q: Is this product still in production?
A: No. The Series 5 Vanguard MCP-1004 is discontinued. Available units are New Surplus or professionally tested stock.
Q: Do you provide test documentation?
A: Yes. Units are verified for power-up, processor operation, CompactFlash recognition, and basic communication. Test reports and photos are available on request.
