IC3600SLEH1G1B (New Surplus): Logic Element Card for Early Speedtronic Turbines

Sourcing a dependable logic card for a Mark I or Mark II Speedtronic panel usually comes down to finding good, matched hardware for a system GE stopped building decades ago. This listing is the IC3600SLEH1G1B in new-surplus, no-box condition an unused board from the IC3600 logic family, offered with a one-year warranty for operators keeping early Speedtronic turbines running.

How the Three-Circuit Logic Element Works

Reference documentation for the SLEH describes a compact, repeatable logic building block, replicated three times on the one card.

The basic gate

Each circuit centers on an 'OR' logic element controlled by two 'AND' gates. If either AND gate receives all '1' inputs, the output (OUT) becomes '1'. The inputs are high-level signals, so expander gates can be applied directly on the standard inputs, and an OR-E expander input is provided for use with the LLXA expander card.

Three circuits, three outputs

The card houses three of these circuits, each acting as a relay or driver output. The relay-driver portion makes an electrical connection to a common terminal whenever its OUT signal is '1'. There is also provision for integrating the logic with external annunciators. Reference listings place the SLEH on a 51-pin edge connector.

Troubleshooting Steps That Come Before Ordering a Replacement

Even when you are buying new-surplus stock as a spare, it pays to confirm the card in service is genuinely the problem. A logic-output fault frequently traces back to something other than the SLEH:

• Missing input, not a dead gate. The output is only '1' when an AND gate's inputs are all '1'. A stuck-low output is often correct logic reacting to an absent input from an upstream card or field device.
• Power rails first. Check the DC supply feeding the logic nest before suspecting the card.
• Edge-connector oxidation. Clean and reseat the card; tarnished fingers on aged connectors cause a large share of "board failures."
• Downstream load. Verify the driven relay or annunciator coil and its wiring.
• Expander path. If the OR-E input and an LLXA expander are used, include them in your checks.

Decoding the SLEH Suffix: Variant Versus Revision

In IC3600SLEH1G1B, "IC3600SLEH" is the function code, "1G" is the variant group, and the trailing "B" is the hardware revision. The related 1G1C carries a later revision letter on the same base card. Because a different trailing character can mean a different dash level, match the complete number to your installed board. Our GE Speedtronic Part Number Decoder explains how these fields are laid out.

Cross-Referencing Other Mark I-II Logic and Expander Boards

The SLEH shares its card nest with expander and logic-element boards such as the LLXA. If you are rebuilding or stocking a panel, it is often worth confirming those companions at the same time. Browse the family on our GE Mark I-II IC3600 Cards collection or the complete GE Speedtronic Turbine Control Boards range.

Details That Speed Up Your New-Surplus Quote

Please give us the full part number (IC3600SLEH1G1B), the revision printed on your board, a photo of the label, your turbine frame and Speedtronic generation, the quantity, and your urgency. New-surplus quantities can be limited, so the sooner we know your target revision, the sooner we can confirm availability.

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General Information about the Product
Part Number	IC3600SLEH1G1B Mark I-II IC3600
Description	IC3600SLEH1G1B By GE Speedtronic IC3600SLEH Logic Element Card NSNB
Condition	newSurplusNoBox With 1 Year Warranty.