Between the VSVO servo processor in a Mark VI rack and the hydraulic hardware it commands sits one dedicated piece of interconnect: the TSVO Servo Terminal Board. This listing is for the IS200TSVOH1BBB — base number IS200TSVOH1B at the BB revision — a used and tested example of the board that carries servo drive signals out to the valves and LVDT position feedback back into the control system.

How TSVO Connects to the VSVO Processor

Per GE-derived documentation, each TSVO interfaces with two electro-hydraulic servo valves — the actuators positioning steam or fuel valves — with valve position measured by LVDTs terminated on the same board. Two cables tie the board to the VSVO I/O processor: one lands on the J5 plug on the VSVO front panel, the other on the J3/J4 connectors of the VME rack. Redundancy is handled at the connector level: a simplex system takes its signals through JR1 alone, while a TMR system distributes them through JR1, JS1, and JT1 so the <R>, <S>, and <T> channels each work from the same field data. Plugs JD1 and JD2 provide the landing point for an external trip from the protection module.

Three Faults the Board Reports — and What They Usually Mean

GE's documentation lists three diagnostic categories for this board, and each has a most-likely real cause:

• Servo current out of limits, or servo non-responsive. Usually the valve: an open or shorted coil, a connector problem in the run, or a hydraulically stuck spool. Measure coil resistance at the terminal block and review hydraulic fluid condition before touching the electronics.
• Regulator feedback out of limits. Usually the LVDT or its wiring — lost excitation, an open secondary, or transposed conductors after maintenance. Verify the transducer circuit end to end.
• Failed ID chip. This one genuinely lives on the terminal board; the system reads the chip to verify hardware identity, and a failure here raises hardware-incompatibility flags that a new board resolves.

The pattern to remember: two of the three standard faults start in the field, not on the board. Replace the TSVO when the evidence has excluded the valve, the LVDTs, the cabling, and the servo processor — or when the board itself is visibly damaged or reporting an identity fault.

Breaking Down the IS200TSVOH1BBB Number

Reading left to right: IS200 is the Speedtronic board series, TSVO the functional acronym for the Servo Terminal Board, H1B the hardware group and version, and the final BB the production revision — which is why listings show both IS200TSVOH1B and IS200TSVOH1BBB for the same physical part. Order against the longest string on your label. Our GE Speedtronic Part Number Decoder explains each field of GE's numbering across the IS200 catalog.

Cross-Generation Notes: From VME Cards to I/O Packs

The TSVO concept outlived the VME rack. In Mark VIe systems, GE's IS220PSVO Servo Control I/O pack is documented as the electrical interface between a TSVO terminal board and one or two I/O Ethernet networks, running two servo valve position loops — and GE notes the pack must be manually reconfigured when the terminal board under it changes. That continuity is good news for plants mid-upgrade: the field wiring practice stays familiar even as the processing electronics move generations. Background reading is in Mark V vs Mark VI: DS200 to IS200, and the hardware itself is collected under GE Mark VI IS200 Boards and GE Speedtronic Turbine Control Boards.

Preparing a Precise Quote Request

• Full part number from the label — IS200TSVOH1BBB — including every revision letter
• A legible photo of the label or nameplate
• Turbine model and frame, and the mating electronics (VSVO card or PSVO pack)
• Whether the loop is simplex or TMR
• Quantity needed and the delivery window you are working against

Why Buyers Source This Board from Us

Because the answer comes fast and the logistics are handled: submit a Request a Quote and receive a response within 24 hours, place the order on a standard purchase order, and take delivery anywhere in the world on DDP terms with customs already cleared. The exact condition and warranty of this unit appear in the table below.

General Information about the Product
Part Number	IS200TSVOH1B Mark VI IS200
Description	GE General Electric IS200TSVOH1B IS200TSVOH1BBB Terminal PC Board Mark VI
Condition	used Clean and Tested. With 1 Year Warranty