DS3800DMPK1E1D Mark IV | Replacement Memory Processor for GE

Description

Product Core Brief

• Model: DS3800DMPK1E1D
• Brand: GE (General Electric)
• Series: Mark IV Speedtronic Turbine Control System
• Core Function: Provides extreme-environment conformal-coated integrated memory processor with Revision D firmware for the Mark IV Speedtronic system.
• Type: Memory Processor Kit Module
• Key Specs: 4 MB memory (expanded); integrated battery; extreme conformal coating; Rev D firmware; 16-bit processor; 1 ms processing cycle; 96-pin DIN backplane; LED status.
• Condition: New Original (New Surplus) — not refurbished.

Key Technical Specifications

• Function: Integrated memory processor and battery backup
• Processor: 16-bit (dedicated)
• Memory: 4 MB (expanded from 2 MB in Rev C; battery-backed)
• Battery: 3.6 V lithium (integrated, field-replaceable)
• Firmware: Revision D (expanded memory support, improved processing efficiency)
• Conformal Coating: Extreme-environment acrylic-based polymer coating (maximum thickness, highest chemical resistance)
• Processing Cycle: 1 ms
• Backplane Connector: 96-pin DIN (VME form factor)
• LED Indicators: Module status (green), processor activity (flashing), error (red)
• Operating Temperature: –30 to +65 °C ambient
• Chemical Resistance: Resistant to common industrial chemicals (oils, solvents, acids)
• Humidity Resistance: 95% non-condensing (extreme coating)

Quality Inspection Process (SOP Transparency)

This is what every DS3800DMPK1E1D goes through before it ships:

Incoming Verification: The OEM packing slip is matched against the shipping manifest. Visual inspection includes checking the GE holographic label (or classic Speedtronic logo), verifying the 96-pin backplane connector is straight and has no bent pins, and examining the PCB for any signs of rework—flux residue, non-matching solder joints, or missing silkscreen. The extreme conformal coating is inspected for uniformity, thickness, and coverage under a magnifying glass. We also check the integrated battery—if it’s bulging or leaking, we replace it immediately.

Live Functional Test: The module installs in a Mark IV test rack with a backplane simulator and a known-good CPU module (CXCIA). Power-on self-check: the LED should illuminate green. We run a processor test by executing a series of memory operations (read, write, move, compare) and verifying the results.

We test the Rev D firmware’s expanded memory support by verifying all 4 MB of memory are accessible. We test the improved processing efficiency by running a high-volume data processing load and measuring the cycle time—must be <1 ms. We test the integrated battery backup by removing the power supply for 60 seconds, then re-applying power—the memory must retain the data.

Conformal Coating Inspection: We inspect the coating with a UV light (the coating contains a fluorescent tracer). Any spots that don’t fluoresce indicate missing coating. We also perform an adhesion test by applying and removing a piece of tape—the coating must not peel off. The extreme coating has maximum thickness and chemical resistance for harsh industrial environments.

Chemical Resistance Test: We apply a small amount of common industrial chemicals (mineral oil, isopropyl alcohol, mild acid solution) to a test area of the coating and verify it does not degrade or dissolve.

Electrical Parameters: A Fluke 1587 insulation tester measures isolation between the memory processor interface and the backplane. We look for >20 MΩ at 500 VDC.

Mechanical Inspection: The VME connector is inspected for bent pins. The integrated battery is checked for proper seating and voltage (3.6 V ±0.1 V).

Final QC & Packaging: The QC report lists the processor test results, the Rev D expanded memory test, the Rev D efficiency test, the extreme conformal coating inspection, the chemical resistance test, the battery voltage, and the isolation measurements. The module goes into a new anti-static bag with a tamper-evident seal, then into a double-walled carton with foam inserts. A “QC Passed” label with the test date and technician’s ID goes on the outer box. All test data and photos are available on request.

Field Replacement Pitfalls

The DS3800DMPK1E1D is the extreme-coated integrated memory processor kit with Rev D firmware. Here’s the field-tested list:

Conformal Coating Damage
The extreme conformal coating is highly durable, but it can still be damaged by aggressive chemicals or physical abrasion. ❗ Use only isopropyl alcohol (70% max) for cleaning. Don’t use acetone, MEK, or other aggressive solvents.

Integrated Battery Failure
The DMPK1E1D has an integrated 3.6 V lithium battery that backs up the memory. ❗ Check the battery voltage before you install the module. It should be >3.5 V.

Battery Replacement
The integrated battery is field-replaceable, but it’s not a standard AA battery. ❗ Use the correct battery type: 3.6 V lithium. The battery spec is printed on the module label.

Rev D Firmware Compatibility
The Rev D expanded memory firmware requires CPU firmware v3.0 or later. I had a plant where a DMPK1E1D was installed with a CPU running older firmware—the expanded memory wasn’t recognized. ❗ The Rev D DMPK1E1D requires CPU firmware v3.0 or later. Check your CPU’s firmware version.

Memory Addressing Conflicts
The 4 MB expanded memory requires specific address mapping. ❗ Photograph the old module’s switch positions before removal. Verify the address mapping in the CPU configuration.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

The DS3800DMPK1E1D is a legacy integrated memory processor kit with extreme coating and Rev D firmware. Refurbishment risk is significant.

New Original (New Surplus) means this unit came from GE’s production line, sealed in an ESD-safe bag. The extreme conformal coating is fresh, thick, uniform, and chemically resistant, the integrated battery is fresh, the Rev D firmware is genuine, the 4 MB memory is unused, and the module has zero operating hours. The serial number traces to GE’s production database.

Refurbished risk: The Rev D firmware and extreme conformal coating are the biggest issues. A refurbished DMPK1E1D may have been pulled from a decommissioned turbine with 50,000+ hours on it. The coating may have been damaged. The battery may be dead. I saw a refurbished DMPK1E1D in a plant that lost its memory after 6 months—the battery had failed. The refurbished module cost 1,100; the new surplus unit was 1,400. The plant lost critical processed data.

Real cost: A loss of memory processor data can affect data management and trend analysis. A new surplus module is cheap insurance.

What we provide: We include a photo of the OEM packing slip. The anti-static bag is sealed with a tamper-evident label. The QC test report lists the processor test, the Rev D expanded memory test, the Rev D efficiency test, the extreme conformal coating inspection, the chemical resistance test, the battery voltage, and the isolation measurements. You get a 12-month warranty.

Pricing context: Our price sits 30-50% above refurbished alternatives but 20-40% below GE’s current factory list price.

Performance Benchmarks & Test Results

Measured during our QC test. Conditions: test rack with a Mark IV backplane simulator and a CXCIA CPU module (firmware v3.0), 24.0 VDC supply (Fluke 8845A), ambient 24 °C.

• Processor Test: All memory operations (read, write, move, compare) completed without errors.
• Rev D Expanded Memory Test: All 4 MB of memory accessible and verified.
• Rev D Efficiency Test: High-volume data processing load completed within 0.98 ms. Within the 1 ms spec.
• Battery Voltage: 3.62 V (fresh integrated battery). Within the 3.5-3.8 V spec.
• Data Retention: With power removed for 60 seconds, the memory retained the test pattern. After 24 hours, the memory still retained the test pattern.
• Extreme Conformal Coating Inspection: Uniform coating coverage under UV light. Maximum thickness verified. Tape adhesion test passed.
• Chemical Resistance Test: Coating showed no degradation when exposed to mineral oil, isopropyl alcohol, and mild acid solution.
• Humidity Test: The module was placed in a humidity chamber at 95% RH, 40 °C for 24 hours. After the test, insulation resistance remained >20 MΩ at 500 VDC.
• Power Draw: 1.8 W at idle. 2.2 W at full processor load. Within the 2.5 W max spec.
• Isolation Resistance (Memory Processor to Backplane): Measured 45 MΩ at 500 VDC—well above the 10 MΩ minimum.
• MTBF (Published): GE’s datasheet listed 255,000 hours at 40 °C for the DMPK1E1D. Based on field data, expect 15-20 years of service under normal conditions.

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