Proximitor, LVDT, and Vibration I/O on One Card

Proximity probes, LVDT position feedback, LM vibration inputs, and a pair of regulator output loops all terminate, electrically speaking, on a single Mark V card: the TCQB extended analog I/O board. This listing is a used, cleaned and tested DS200TCQBG1BCB. The card rides at location 3 in each control core — <R>, <S>, and <T> on TMR panels, <R> alone on Simplex — where it extends the analog capacity of the primary TCQA card. Its presence is application-dependent: GE fitted it on steam Simplex units and on TMR units that needed proximitor coverage, per the Mark V application manual (GEH-6195).

A configuration detail that matters in service: the first three proximitor inputs, PRX01 through PRX03, are dual-purpose. Hardware jumpers on the card — fifteen in total — plus matching I/O configuration constants switch those points between proximity transducers and accelerometers. The Mark V both excites accelerometer sensors and scales their feedback, so a card configured for the wrong sensor type produces plausible-looking garbage rather than an obvious fault.

Five Checks Before You Condemn the TCQB

• 1. Cross-core comparison. On TMR, pull up the same channel in <R>, <S>, and <T>. A lone dissenter implicates one card; unanimous nonsense implicates the probe or wiring.
• 2. Field loop integrity. Probe gap, extension cable, connector corrosion, termination screws. The card is the last element in the chain, not the first.
• 3. Jumper audit. Any recent sensor work on inputs 1–3? Confirm the jumper positions match the sensor type actually connected before blaming hardware.
• 4. Power and seating. OK LED dark? Reseat the card and inspect the ribbon cables from the core's TCPS supply — a documented Mark V case saw cards vanish from the I/O status list because one power ribbon was loose, and the durable fix was a new TCPS, not new I/O cards.
• 5. EPROM condition. Socketed firmware chips develop pin corrosion with age; intermittent configuration or diagnostic errors sometimes end with a careful reseat. And if a previous board swap skipped the EPROM transfer, the symptoms are immediate and total.

Suffix Logic Behind DS200TCQBG1BCB

Split the number: DS200 (GE board series) + TCQB (extended analog I/O) + G1B (Group 1, base functional revision B) + CB (later revisions — a subsequent functional revision C and artwork revision B, by the surplus trade's reading). Compatibility runs on the group and base revision: a G1B board answers for G1B positions; G1A and G2A are separate builds we stock and quote separately, and no G-group number ever answers for an H-group label. Copy the label string exactly — including that final pair of letters — into your RFQ. The framework, with worked examples across the DS200 and IS200 lines, is in our GE Speedtronic Part Number Decoder.

From Mark V Analog Cards to Mark VI I/O

The TCQA/TCQB/TCQC division of analog labor is a Mark V signature; the Mark VI platform reorganized these functions onto IS200-series boards with a different I/O architecture. Plants running both generations — or planning the jump — can orient with Mark V vs Mark VI: DS200 to IS200. For staying the course on Mark V, the GE Mark V DS200 Boards collection covers the analog family and its neighbors, mapped out in GE Mark V DS200 Boards Explained.

What to Put in Your Quote Request

• Full label part number: DS200TCQBG1BCB
• Label photo — plus a shot of the jumper area if configuration questions are open
• Panel: Simplex or TMR; turbine: steam or gas; sensor types on inputs 1–3 if known
• EPROM plan — transfer from the old board, or PROM set needed alongside
• Quantity, urgency, and DDP destination

Same-Day RFQ Handling, Worldwide DDP

Hit Request a Quote with the details above; our team answers within 24 hours, often sooner during forced outages. This board ships cleaned and tested with the warranty stated below, DDP to your site anywhere in the world, against your purchase order.

General Information about the Product
Part Number	DS200TCQBG1B
Description	GE DS200TCQBG1B DS200TCQBG1BCB RST Extended Analog I/O Board Mark V
Condition	used Clean and Tested. With 1 Year Warranty.