Title: Johnson Controls Cardkey CK721-700 Network Controller | 27-4805-05 | Faulty/For Parts
Faulty/for parts Johnson Controls CK721-700 (PN 27-4805-05) Network Controller. Central hub for legacy Cardkey C-CURE 700/7000 security systems. Sold as-is for repair, salvage, or component recovery.
Product Overview:
This listing is for a non-working, faulty Johnson Controls (formerly Cardkey) CK721-700 Network Controller with manufacturer part number 27-4805-05. This device served as the critical communications hub for the legacy Cardkey C-CURE 700 and 7000 physical access control systems.
As a core component of now-obsolete systems, this unit is offered for parts, repair, or technical salvage only. It is ideal for technicians, refurbishers, or organizations maintaining legacy systems who need components, boards, or chassis for repair projects.
Key Features & Specifications:
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Manufacturer: Johnson Controls (originally branded as Cardkey Systems).
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Model: CK721-700 Network Controller.
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Johnson Controls Part Number: 27-4805-05 (primary identifier).
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Legacy Part Number: Often referenced as CK721-700.
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Application: Designed for the C-CURE 700 & 7000 software platform.
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Function: Acted as the primary network controller, managing communication between the host PC/server running C-CURE software and downstream field hardware (e.g., reader interface modules, door controllers).
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Form Factor: Standard 19″ rack-mount chassis.
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Condition: FAULTY / NON-FUNCTIONAL. Sold for parts, repair, or component recovery only. Not guaranteed to be operational.
Common Faults & Notes for Buyers:
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These units are often decommissioned due to system upgrades to newer platforms like C-CURE 8000/9000 or due to age-related failures.
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Typical failure points include power supply issues, failed internal batteries (for memory backup), corrupted firmware, or damaged communication ports.
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Important: This is a legacy system component. Software, firmware, and integration support from Johnson Controls are no longer available for new installations.
Intended Use:
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Parts Harvesting: For technicians to salvage working components (boards, connectors, power supplies) to repair other units.
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Legacy System Support: For organizations with an active, aging C-CURE 700/7000 system that requires spare parts to maintain operations.
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Technical Training & Repair Projects: For educational or bench repair practice.
