GE DS3800HMPK1J1J Mark IV Microprocessor Board

The GE DS3800HMPK1J1J is a microprocessor board designed for the General Electric Mark IV DS3800 control system. It contains an onboard microprocessor and EPROM devices for processing and program storage. The board also features front-visible status indicators, modular connections, and retention levers for installation in the control rack.

Hardware Configuration and Board Features

The DS3800HMPK1J1J combines microprocessor circuitry with EPROM memory devices on a printed circuit board assembly. The EPROM devices store program data required by the board, while the processor executes the associated control logic within the Mark IV system.

Visible hardware features include:

• Onboard microprocessor
• EPROM memory devices
• Three red indicator LEDs
• One amber status LED
• Modular connector
• Board retention levers

The board also has multiple connectors for rack and board-level connections. Exact signal assignments should be verified against the applicable Mark IV documentation.

Status Indicators and Diagnostics

The front-visible LEDs provide status information during board initialization and operation. The amber I'M OK indicator is particularly useful during startup checks. According to the available product-specific troubleshooting information, it should illuminate briefly, turn off briefly, and then remain illuminated after initialization.

An incorrect indicator sequence can warrant inspection of the board seating, Berg jumper positions, and PROM installation on the associated daughterboard. These checks help distinguish initialization problems from potential hardware or memory-related faults.

Installation and Maintenance Considerations

The board uses a modular connector at one end and retention levers at the other. These mechanical features support installation and retention in the Mark IV rack assembly.

Before handling or replacing the board, isolate the relevant electrical supplies and verify that the drive is de-energized. The Mark IV drive may contain multiple AC and DC power sources, so removing only one supply does not necessarily eliminate all electrical hazards.

Technical Specifications

Frequently Asked Questions

Q: What is the function of the GE DS3800HMPK1J1J?

A: The DS3800HMPK1J1J is a microprocessor board for the GE Mark IV DS3800 control system. Its onboard processor and EPROM devices provide processing and program-storage functions within the control architecture.

Q: What should the amber I'M OK LED indicate during startup?

A: The documented startup sequence is a brief illumination, a brief period off, and then continuous illumination. If this sequence is not observed, check the board installation, Berg jumper positions, and PROM seating on the associated daughterboard.

Q: Can the DS3800HMPK1J1J be replaced with another DS3800HMPK revision?

A: Do not assume interchangeability based on the shared DS3800HMPK base designation. Confirm the complete part number, hardware configuration, EPROM arrangement, and applicable system requirements before selecting a replacement.