DS3800DFPH1D1B: Factory-Packaged New Surplus

This DS3800DFPH1D1B is new-surplus stock, still in its factory packaging and never placed into service, with a one-year warranty. It is a GE Speedtronic Mark IV control board assembly from the DS3800 series — GE's first turbine control platform to combine triple modular redundant (TMR) architecture with digital control calculations across gas and steam machines.

In the Mark IV cabinet, three control processors — <R>, <S> and <T> — run the control logic in parallel and reach decisions by two-out-of-three voting, while a <C> communications processor exchanges data with the CRT operator interface. The DFPH assembly is one of the DS3800 boards seated in that rack and wired to its neighbors through ribbon cables and backplane connectors. Since DFPH designates a defined slot in the lineup, verify the board's precise function in your unit's elementary drawings before you order; we do not state channel counts, pinouts or voltages unless they are printed on the board itself.

Reading the 1D1B Group Code

The part number splits into DS3800 (the Mark IV family), DFPH (the card function) and 1D1B (the group and revision). The 1D group distinguishes this board from earlier 1A and 1B groups of the same DFPH card, and the trailing 1B is its revision within that group. Those differences can matter for configuration or firmware, so match the whole suffix to the board you are replacing rather than assuming any DFPH will drop in. For a step-by-step breakdown of how GE composes these numbers, see the GE Speedtronic Part Number Decoder.

Rule Out the Common Look-Alikes First

Before you install a replacement, make sure the board you are removing is genuinely the problem. On Mark IV panels these are the usual imposters:

• Power supply. A failing DS3800 supply or an out-of-tolerance DC rail can throw symptoms across several cards at once — check the rails before anything else.
• Ribbon and connector. Reseat the board and inspect the cable and backplane for bent pins, corrosion or a loose latch; these cause most intermittent faults.
• Core voting. Determine whether <R>, <S> or <T> is the odd one out; a single disagreeing core narrows the fault dramatically.
• Companion cards. The board that shares signals with the DFPH can be the true source of an alarm.
• Calibration state. A new board with default trim settings must be adjusted to your site before it will read correctly.

Neighboring Boards in the Mark IV Cabinet

The DFPH is one member of a large DS3800 family that also includes microprocessor boards, memory cards, communication boards and power supplies. Our GE Mark IV DS3800 Boards collection brings them together, while the broader GE Speedtronic Turbine Control Boards catalog covers other Speedtronic generations. If obsolescence planning is on your mind, Mark V vs Mark VI: DS200 to IS200 outlines the move from DS-series to IS-series hardware.

Send These Details for Your Quote

• The complete part number with suffix (DS3800DFPH1D1B);
• Board revision and any label or silkscreen markings — a photo speeds verification;
• Turbine frame and confirmation that the panel is Mark IV;
• Quantity and urgency, whether an outage replacement or a planned spare.

Request a Quote Today

This DS3800DFPH1D1B is offered as sealed new surplus in factory packaging with a one-year warranty. Hit Request a Quote and expect a response within 24 hours. We ship worldwide on DDP terms and welcome purchase orders from qualified buyers; a label photo and your turbine details let us confirm the exact match before you commit.