DS200TCQCG1BKG: Same Function, One More Layer of Revision

Located in position 4 of the Mark V's <R>, <S>, and <T> cores, the TCQC works alongside the TCQA to handle a core's analog load — supplying excitation for the position LVDTs and digitally converting the fuel flow requested by the control system into an analog signal. GE itself documents this board under two names: RST Overflow Board and Analog IO Expander Board.

Why Check the TCQA First

Since the TCQC depends on the TCQA (and the TCQB, when present) installed on the same core to operate, a problem that at first looks like a TCQC issue — a wrong analog reading, unstable LVDT excitation — can actually originate on the TCQA. Start the diagnosis there.

Diagnose Before You Buy

• Verify the TCQA on the same core is operating normally before suspecting the TCQC.
• If the alarm involves an out-of-spec voltage on the diagnostic screen, check the core power supply's (TCPS) fuses and the consistency of the system's calibration file with the boards/PROMs installed before swapping any hardware.
• Physically confirm, by looking at the core, that the TCQC is actually installed — not every Mark V configuration uses this board.
• Inspect the 34- and 40-pin flat cables and their connectors before assuming an internal board fault.

Reading the Part Number

DS200TCQCG1B is the base reference (DS200 family, TCQC function, G1 group, B revision); DS200TCQCG1BKG is the full revision stamped on the physical label — KG identifies this specific combination of functional and layout revisions. Always provide the complete code when requesting a quote.

This Unit

Used, cleaned and tested, with a 1-year warranty.

Details for Your Quote

• Full part number with suffix (photo of the label)
• Affected core and the status of the corresponding TCQA
• Mark V Simplex or TMR
• Urgency

Request a quote through Request a Quote: response within 24 hours, worldwide DDP dispatch, purchase orders accepted.

• GE Mark V DS200 boards explained
• All GE Speedtronic boards