Location 3: Where the TCQB Sits in <R>, <S>, and <T>

Location 3 of the Mark V control cores is reserved for a card many operators never think about until an LVDT or proximitor channel goes quiet. That card is the TCQB — the RST Extended Analog I/O board — and this listing is a cleaned and tested DS200TCQBG1BBA. In a TMR panel there are three of them, one per control core; a Simplex panel carries a single board in <R>. The TCQB is an optional card in the architecture: panels are fitted with it when the application needs analog capacity beyond the primary TCQA card, which it partners directly. Mark V application material (GEH-6195) assigns it proximitor inputs, LVDT/LVDR position feedback, LM vibration inputs, and a pair of regulator milliamp outputs, with steam Simplex units and proximitor-equipped TMR units as the typical hosts.

Troubleshooting Analog I/O Faults Before Buying a Board

The fastest way to waste an outage window is to replace a healthy analog card. Mark V field history suggests this order of investigation:

• Compare across cores (TMR). One core's reading disagreeing with its siblings implicates that core's hardware; all three agreeing on a wrong value implicates the transducer or wiring. This single check prevents most unnecessary board purchases.
• Walk the loop. Probe or LVDT, extension cabling, terminations, then the card. Decades-old field wiring fails far more often than socketed logic boards.
• Look at the OK LED from the side of the rack. Dark with the core powered? Check card seating and the ribbon cables from the core's TCPS power supply before condemning the card — documented field cases have traced "failed" analog cards to a single loose power ribbon, and one repeat-rebooting core was finally fixed by a TCPS replacement.
• Reseat socketed firmware. Corroded EPROM pins produce intermittent diagnostics that mimic board failure. Wrist strap on, reseat, retest.
• Read the alarm text precisely. TCQA, TCQB, and TCQC are distinct cards living in the same cores. Confirm which one your diagnostic actually names before you order.

When the card is genuinely at fault, this tested G1BBA replaces like-numbered boards directly — with one critical step covered below.

How to Read DS200TCQBG1BBA

Field by field: DS200 identifies the GE board series; TCQB the extended analog I/O function; G1B is Group 1 at base functional revision B; and BA closes the string with the later revision letters — by trade convention, a subsequent functional revision B and artwork revision A. The group-plus-base-revision (G1B here) is the line that must match your installed board; we also hold G1A, other G1B revisions, and G2A stock, so the exact label string determines what we quote. See the GE Speedtronic Part Number Decoder for the complete framework, including why groups (and G versus H prefixes) are never interchangeable.

The EPROM step: your unit's firmware lives in socketed EPROM modules on the old board. Replacement boards do not arrive with your application code; the modules transfer across (with anti-static precautions — wrist strap, static bag, careful prying clear of neighboring components) or a matching DS200TCQBF1-series PROM set provides them. Plan that step into the outage before the board arrives on site.

Working Partners of the TCQB Card

In order of appearance in most investigations: TCQA (primary analog I/O, the card TCQB extends), TCQC (analog expander), the core's TCPS power supply, and the termination hardware the field wiring lands on. All are part of the GE Mark V DS200 Boards collection; the platform tour in GE Mark V DS200 Boards Explained shows how the analog family divides the work, and Mark V vs Mark VI: DS200 to IS200 covers the successor platform's approach to the same signals.

Your RFQ Checklist

• Part number exactly as labeled: DS200TCQBG1BBA — all letters matter
• Photo of the board label
• Simplex or TMR, and the turbine type the panel controls
• Firmware plan: transferring EPROMs, or a PROM set quoted alongside
• Quantity, urgency, delivery country

Tested Stock, Quoted in 24 Hours

This used DS200TCQBG1BBA is cleaned, tested, and warranted as stated in the table below. Send a Request a Quote with your checklist details; a firm response with availability follows within 24 hours. We ship DDP worldwide and accept purchase orders — from single boards for a forced outage to full multi-core sets for TMR panels.

General Information about the Product
Part Number	DS200TCQBG1B
Description	GE DS200TCQBG1B DS200TCQBG1BBA RST Extended Analog I/O Board Mark V
Condition	used Clean and Tested. With 1 Year Warranty.