When a GE Speedtronic Mark IV panel stops exchanging data with its neighbors, the DS3800HDRA1A1A line driver/receiver board is one of the parts that makes that exchange possible in the first place. This listing is a used board, cleaned and tested, with a one-year warranty.

What a line driver/receiver board does in Mark IV

Every serial link in a Mark IV needs something to launch the signal at one end and recover it at the other. That is the job of the HDRA: it drives outgoing data with enough strength to cross the distance between cabinets and receives incoming data while filtering the interference typical of a generating station. In the redundant Mark IV architecture the control cores <R>, <S> and <T> must stay in step and report to the <C> communicator, and driver/receiver boards form the wired path that lets them. The card is recognizable by its two front-facing 40-pin connectors, two configuration jumpers, and lever-style retainers; like all DS3800 boards it is sensitive to static discharge.

Troubleshooting communication faults before swapping boards

The costliest mistake with a communication problem is to replace the visible board and then discover the fault was elsewhere. Run these checks first:

• Cabling: reseat both 40-pin connectors and inspect the harness for damage or a connector backed partway out.
• Jumpers: record the two jumper positions on the existing board and reproduce them exactly on any replacement.
• Far end: test or substitute the device at the opposite end of the link; a fault there mimics a fault here.
• Power: confirm the rack supply voltages are healthy, because marginal power weakens the line drive.
• Seating: make sure the retention levers are fully closed and the board is bottomed in its slot.

If the link still fails only when this card is installed, you have isolated the HDRA.

The role of the 1A1A group code

The suffix on a DS3800 number is not decoration. In DS3800HDRA1A1A, the DS3800 names the Mark IV series, HDRA identifies the line-driver/receiver function, and 1A1A is the group/revision that distinguishes this hardware build from others. Match that suffix to your removed board where you can; where you cannot, contact us and we will tell you whether a different revision — a 1B1B, say — is a valid substitute for your configuration. The GE Speedtronic Part Number Decoder explains how to read the whole string.

Companion communication hardware

The HDRA does not work alone. It shares the Mark IV communication subsystem with the media-access hardware — the DS3800HMAC media access board and the DS3820MAUD module it mounts in — which govern access to the system bus while the HDRA drives and receives the actual line signals. If you are servicing a communication problem, it is worth checking those companion parts at the same time. Explore related stock in the GE Mark IV DS3800 Boards collection or the full GE Speedtronic Turbine Control Boards range.

How to get an accurate DS3800HDRA1A1A quote

Help us match your board on the first pass by sending:

• The complete number with suffix, DS3800HDRA1A1A.
• A clear photo of the board label and its revision codes.
• The Mark IV panel, turbine model, and where the board sits in the link.
• Quantity and the urgency of the need.

Request a Quote for a reply within 24 hours. We deliver worldwide on DDP terms, accept purchase orders from established accounts, and can quote companion communication boards alongside this one.

General Information about the Product
Part Number	DS3800HDRA1A1A Mark IV DS3800
Description	GE General Electric DS3800HDRA1A1A DS3800HDRA Line Driver And Receiver Board
Condition	used Cleaned and Tested. With 1 Year Warranty.