DS3800NDAC1E1F: A Later Revision in the NDAC Line

Across the DS3800NDAC family you'll see production/revision codes like 1A1A, 1B1B, and 1D1E. This unit carries 1E1F — run "E," revision "F," placing it among the later revision letters documented for this board. GE structured its Speedtronic part numbers the same way across the DS3800 line: the DS3800 prefix names the board family, the four letters that follow (NDAC) name the function, and the trailing characters track production run and engineering revision. GE never published a public explanation of exactly what each individual revision letter changed, so we won't speculate about specifics we can't confirm — what's documented is that GE's part-number conventions are typically addressed in the Renewal/Warranty Replacement section of the hardware manual, and that matching the full suffix to your existing board matters more than matching the base part number alone. If you're unsure whether your rack can accept a different suffix than what's currently installed, send us a photo of your existing board's label and we'll help confirm compatibility before you order. Our GE Speedtronic Part Number Decoder covers this logic in more detail.

Its Job Inside the Mark IV Panel

The DS3800NDAC is the analog output board in GE's Speedtronic Mark IV control system — the first Speedtronic platform built on triple modular redundant (TMR) control, running three parallel processors (documented as <R>, <S>, and <T>) alongside a <C> communications processor, with two-out-of-three voting on outputs. The board's function is to take the digital control values this architecture produces and convert them into the analog voltage or current signals that drive valves, actuators, and other final control elements on the turbine. This DS3800NDAC1E1F is a used board, cleaned and tested, with a 1-year warranty.

Check These Before Assuming This Board Has Failed

An analog output fault at the panel doesn't automatically mean this card needs replacing:

• Ribbon cables and terminal connections to the field device — corrosion and loose seating are common on aging racks and can mimic a failed channel.
• The actuator and its feedback instrument — a faulty LVDT or sticking valve can look identical to a bad output signal from the rack.
• Power quality feeding the rack — marginal supply voltage can cause card-like symptoms that disappear once corrected, without any board being swapped.
• The specific channel alarming — with two-out-of-three voting across <R>, <S>, and <T>, a single-channel fault can raise a diagnostic without a trip. Confirm the channel before deciding which card to pull.

Replace the board once wiring, the field device, and power have all been ruled out.

Boards That Belong to the Same Analog Chain

The DS3800NADA is the complementary analog-to-digital board on the input side of the same signal path, and other "N"-prefixed DS3800 cards handle current-loop and thermocouple inputs. Confirm against your elementary diagrams which specific card is carrying the loop you're troubleshooting before you order a replacement. Our GE Mark IV DS3800 Boards collection lists the wider DS3800 family for reference.

Details to Send With Your Quote Request

• The complete part number and suffix as printed on the board label
• A photo of the label if there's any doubt about a character or revision letter
• Turbine model and confirmation the control system is Mark IV Speedtronic
• Quantity and urgency — routine stocking or an active outage

We respond to quote requests within 24 hours, ship worldwide on a DDP basis, and accept purchase orders. Click Request a Quote to begin.

General Information about the Product
Part Number	DS3800NDAC1E1F Mark IV DS3800
Description	DS3800NDAC1E1F by GE General Electric DS3800NDAC Analog Output Board Mark IV
Condition	used Cleaned and Tested. With 1 Year Warranty.