The Group 2 Variant of the Mark V Extended Analog Board

Group 2 TCQB boards serve the same extended analog role as their Group 1 siblings — with a variant build that must be matched deliberately, never assumed. This listing is a new surplus DS200TCQBG2A, full revision DS200TCQBG2AEB, in original factory packaging. Like every TCQB, it belongs at location 3 of the Speedtronic Mark V control cores (<R> alone on Simplex; <R>, <S>, and <T> on TMR), working as the extension partner of the TCQA primary analog I/O card. Its input groups per the Mark V application documentation: proximitor channels, LVDT/LVDR feedback, LM vibration inputs, and two regulator milliamp outputs — the mix found on steam Simplex panels and proximitor-equipped TMR units.

Configuration Jumpers and Why They Matter

Fifteen hardware jumpers configure this card, and the ones that bite are on the first three proximitor points, PRX01–PRX03. Those inputs accept either proximity transducers or accelerometers; the jumper positions and the I/O configuration constants must both agree with the sensor actually wired in. Set for the wrong type, the channel does not fail cleanly — it reads convincingly wrong, which is worse. The board also carries labeled TP test points for bench diagnostics, a side-visible OK LED, a 50-pin connector, and socketed EPROM firmware discussed below. After any sensor replacement or panel work near the card, an eyes-on jumper audit against the application documentation is cheaper than any hardware change.

Diagnosing Analog Channel Problems First

Before this G2A leaves our shelf for your site, make sure the fault is on the card:

• TMR panels: the same channel read in three cores is a built-in test instrument. One deviant core — suspect that core's card. Three matching-but-wrong readings — suspect the field side.
• Field loop before logic: probe gap and condition, extension cables, junction boxes, termination tightness.
• Core power before card: a dark OK LED with a live core sends you to card seating and the TCPS supply's ribbon cables — the documented culprit in a widely read Mark V rebooting-core case that was finally closed by a TCPS swap.
• Firmware before hardware: reseat aging socketed EPROMs (wrist strap mandatory); corroded pins imitate board failure intermittently, which is the most expensive way to fail.

Breaking Down DS200TCQBG2AEB

Reading the string: DS200 marks the GE board series; TCQB the extended analog I/O function; G2 the Group 2 build — the compatibility boundary separating this board from the G1A and G1B stock we also carry; A the base functional revision; EB the later revision letters (a subsequent functional revision E and artwork revision B, as the trade reads them). If your label says G2A with any trailing letters, quote it exactly; if it says G1-anything, do not order a G2 — groups are different builds, exactly as a G-prefix part is never an H-prefix part. Method and worked examples: GE Speedtronic Part Number Decoder.

Firmware note: replacement boards ship without application EPROMs installed. Your code transfers from the outgoing board's modules, or a DS200TCQBF1-series PROM set at the correct revision supplies it — available to quote together with this board.

Speedtronic Context and Successor Platforms

The TCQB shares the analog workload with TCQA (primary) and TCQC (expander) — both documented on this site — inside the Mark V's core-based architecture; the Mark VI generation redistributed those functions across IS200-series hardware. Context reading: GE Mark V DS200 Boards Explained and Mark V vs Mark VI: DS200 to IS200. Stock overview: GE Mark V DS200 Boards.

Quotes in 24 Hours, Worldwide DDP

Request a Quote with the full label part number (DS200TCQBG2AEB), a label photo, panel configuration (Simplex or TMR), turbine application, firmware plan, quantity, and destination. Our answer — availability, condition, lead time — arrives within 24 hours. Delivery is DDP to your plant anywhere we serve worldwide; purchase orders accepted. Condition and warranty for this factory-packaged surplus board are stated below.

General Information about the Product
Part Number	DS200TCQBG2A Mark V DS200
Description	GE DS200TCQBG2A DS200TCQBG2AEB RST Extended Analog I/O Board Mark NEW
Condition	newSurplusFactoryPackage Original Factory Packaged. With 1 Year Warranty.