IC3600SLEH1G1C Logic Element Card by GE Speedtronic

Part number IC3600SLEH1G1C is a Mark I-II (IC3600) logic element card from GE's original Speedtronic turbine-control line, offered here as a clean, tested, used unit. It carries the "1C" revision of the SLEH1G board the same logic-element function as the earlier 1B dash, at a later hardware revision. For engineers maintaining vintage Speedtronic panels, matching that revision correctly is the whole game.

Role of the Logic Element Card in Mark I and Mark II Turbine Control

Before GE moved turbine logic into microprocessors, the Mark I and Mark II systems implemented their permissive and protective decisions with plug-in logic cards. The SLEH is one of those cards. Reference descriptions credit it with three identical logic circuits, each formed by an 'OR' element gated by two 'AND' gates: the output goes true only when all inputs to one of the AND gates are true. Each circuit drives a relay or driver output to a common terminal, the inputs are high-level, and an OR-E expander input allows a gate to be expanded (for example with an LLXA expander). The board is described on a 51-pin edge connector, with provision for external annunciator connections.

Confirm the Real Problem Before Replacing the Card

A logic card is easy to blame and often innocent. When a Mark I-II output misbehaves, run these checks before you swap the SLEH:

• Look at the inputs. The output is a strict function of the inputs; if the card is holding an output low, first prove that all the required inputs are actually present. A missing upstream signal produces exactly the same symptom as a "bad" card.
• Verify the DC logic supply. Confirm the power-supply cards feeding the nest are within tolerance.
• Service the connector. Reseat the card and clean the edge fingers; connector oxidation is a leading cause of intermittent logic on decades-old boards.
• Prove the load. A relay or annunciator that will not actuate can be a coil or wiring fault downstream of the card.
• Narrow to one of three circuits. Establish which circuit is at fault so you test the right signal path.

Only when inputs, supply, connector and load all check out should the card be treated as the failed item.

What Changes Between the "1G1C" and Other SLEH Dash Numbers

The code reads as function (IC3600SLEH), variant (1G), and revision (1C). The 1C is a later revision than 1B on the same base card; other references list SLEH1 and SLEH1F variants. Trailing characters track hardware revisions and dash levels, so order to the complete number and confirm the revision on your board. See the GE Speedtronic Part Number Decoder for the field-by-field breakdown.

Related Boards You May Need Alongside the SLEH

Expander cards such as the LLXA extend the SLEH's gate inputs, and the surrounding nest holds other IC3600 logic and interface boards. If you are refurbishing a panel, our GE Mark I-II IC3600 Cards collection and the broader GE Speedtronic Turbine Control Boards range are good starting points for matching companions.

Information to Include With Your Request

For a first-time-right match, send the full part number (IC3600SLEH1G1C), the revision on the label, a clear photo of the card, your turbine model and Speedtronic generation (Mark I or Mark II), the quantity, and whether the machine is down. The more of this you provide, the tighter our quote.

Request Your IC3600SLEH1G1C Quote

We supply worldwide with DDP delivery and accept purchase orders. Hit Request a Quote with your details and expect a response within 24 hours for the IC3600SLEH1G1C in the revision and condition you need.

General Information about the Product
Part Number	IC3600SLEH1G1C Mark I-II IC3600
Description	IC3600SLEH1G1C By GE Speedtronic IC3600SLEH Logic Element Card
Condition	used Clean and Tested With 1 Year Warranty.