The Question to Answer First: Is It Actually the Board?

Of everything in this listing, this is the part worth reading before you place an order. On a GE Speedtronic Mark IV panel, a valve that won't move correctly or an analog reading that looks wrong is commonly blamed on the DS3800NDAC analog output card by default — but the card is only one point in a longer signal path, and swapping it doesn't help if the real problem is elsewhere:

• Ribbon cables and terminal connections between the rack and the field device are a frequent culprit on panels of this age. Corrosion or a connector that has worked loose can present exactly like a dead output channel.
• The actuator or its feedback device (an LVDT, for example) can fail in a way that looks identical to a bad analog signal, even though the card itself is outputting correctly.
• Power quality into the rack matters — this card depends on clean, regulated supply like every other card in the panel, and marginal power can cause symptoms that vanish once corrected, with no board ever needing replacement.
• Which processor is actually alarming. Mark IV runs triple modular redundant control across three processors — documented as <R>, <S>, and <T>, with a <C> communications processor — voting two-out-of-three. A fault confined to one channel can raise a diagnostic without tripping the turbine, so confirm which channel before deciding which physical card to pull.

If you've worked through wiring, the field device, and power, and the fault still points squarely at this board, then a replacement DS3800NDAC1E1E is the right next step.

What This Board Does

The DS3800NDAC converts the digital output values calculated by the Mark IV control system into the analog voltage or current signals used to drive valves, actuators, and similar final control elements on the turbine and its auxiliaries. This unit, DS3800NDAC1E1E, is supplied used, cleaned and functionally tested, with a 60-day warranty.

What "1E1E" Means — and Doesn't Mean

DS3800 identifies the board family, NDAC identifies the analog output function, and 1E1E identifies the production run and revision — run "E," revision "E." GE never published a public table of what changed letter-by-letter, so we're not going to guess. What's documented is that GE's own conventions for these production/revision codes are typically referenced in the Renewal/Warranty Replacement section of the hardware manual, and that later runs aren't automatically drop-in compatible with earlier ones. Match the full suffix to your existing board's label; if you're not sure, send a photo and ask us before ordering. See our GE Speedtronic Part Number Decoder for the broader logic behind this numbering across Mark IV, V, and VI.

Companion Boards Worth Knowing About

The input-side counterpart to the DS3800NDAC is the DS3800NADA, which handles analog-to-digital conversion; other "N"-prefixed DS3800 cards cover current-loop and thermocouple inputs elsewhere in the same rack. If it's not certain the fault is on the output side specifically, check your panel's elementary drawings before ordering. Our GE Mark IV DS3800 Boards collection covers the surrounding family, and our Mark V vs Mark VI: DS200 to IS200 guide is useful if you're evaluating a broader migration away from Mark IV hardware.

What We'll Ask For When You Request a Quote

• The full part number and suffix exactly as printed on the label
• A photo of the label, especially if it's worn or has handwritten markings
• Turbine model and confirmation the system is Mark IV Speedtronic
• Quantity and urgency — planned spares or unit down now

Quotes are turned around within 24 hours, shipping is worldwide DDP so import duties are already handled, and we accept purchase orders. Use the Request a Quote button to get started.

General Information about the Product
Part Number	DS3800NDAC1E1E Mark IV DS3800
Description	DS3800NDAC1E1E by GE General Electric DS3800NDAC Analog Output Board Mark IV
Condition	used Cleaned and Tested. With 60 Day Warranty.