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Key Technical Specifications
| Parameter | Specification |
| Model Number | MC-603-01A |
| OEM Part Number | 885 72739837 |
| Manufacturer | NABCO (Nabtesco Corporation) |
| Primary Application | Marine main engine remote control & propulsion safety systems |
| Board Function | Command logic processing, signal interlock, and output relay control |
| Power Supply Voltage | 24 V DC (±10%) |
| Input Channels | Opto-isolated digital inputs for bridge/ECR control commands |
| Output Channels | High-reliability relay contacts and solid-state driver outputs |
| Operating Temperature | -10°C to +70°C (14°F to 158°F) |
| Protection Standard | Moisture, salt-spray, and vibration-resistant conformal coating |
| Weight | 0.42 kg (0.93 lbs) |
Product Introduction & Supply Chain Strategy
The NABCO MC-603-01A 885 72739837 is an output driver and command logic processing circuit board designed for NABCO main engine remote control consoles. It routes directional commands, interlock signals, and valve drive outputs between the bridge telegraph, Engine Control Room (ECR), and main engine pneumatic actuator systems.
Carrying this module as a New Surplus spare is an essential risk mitigation strategy for ship operators. Logic driver card failures lead to dead-in-water (DIW) scenarios, preventing main engine starting or reversing during critical maneuvering. Sourcing genuine New Surplus guarantees zero contact wear and fresh capacitors, eliminating the high failure rates of second-hand units while bypassing extended factory lead times.
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Power Lockout: De-energize the 24V DC main power supply feeds to the propulsion control rack. Use a digital multimeter to confirm zero potential across terminals.
- ESD Protection: Wear a grounded ESD wrist strap before handling the replacement PCB.
- Configuration Check: Document and photograph all DIP switch locations, pin jumpers, and terminal connections on the old board.
Stage 2: Removal
- Unplug card-edge wire harnesses and screw-terminal connectors. Avoid pulling on single wires.
- Undo the chassis mounting screws securing the PCB to the enclosure plate.
- Slide the card out horizontally to prevent bending the rear backplane interface pins.
Stage 3: Installation (Clone & Seat)
- Duplicate all DIP switch positions and jumper links from the original unit onto the new MC-603-01A card.
- Seat the module into the card guide rails and slide it firmly into the backplane connector.
- Fasten mounting screws to 0.8 N·m to protect against engine room vibration.
Stage 4: Power-On & Testing
- Re-apply 24V DC power. Verify the main status LED lights up solid green without fault codes.
- Execute a simulated start/ahead/astern sequence from the ECR desk to confirm relay actuation.
- Validate interlock safety logic before returning the system to operational readiness.
MC-603-01A 885 72739837
MC-603-01A 885 72739837
MC-603-01A 885 72739837
Firmware/Software Versions & Upgrade Notes
- Hardware Logic: The MC-603-01A utilizes discrete hardware logic arrays and factory-programmed ICs. No external software flasher or laptop connection is required.
- Part Number Matching: Confirm that the primary part number matches
885 72739837. Variations in the middle digits can indicate alternate relay contact configurations or voltage handling specs. - Interchangeability Warning: Do not substitute “01A” variants with “01B” or “02A” revisions without verifying terminal pinout schematics, as internal logic gating differs between sub-revisions.
Frequently Asked Questions (FAQ)
Is this NABCO MC-603-01A 885 72739837 unit original and unused?
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned vessel, and not refurbished. All modules undergo quality inspection to ensure OEM-level reliability.
Why buy New Surplus instead of a cheaper refurbished card?
Refurbished relay driver cards frequently suffer from pitted relay contacts, dried electrolytic capacitors, and solder fractures caused by continuous marine vibration. A failed refurbished board during vessel maneuvering can lead to emergency port delays or collisions. New Surplus provides full 10–15 year component longevity and absolute reliability at a fraction of factory list price.
Does this board require field software programming during replacement?
No software installation is required. System configuration is handled entirely through onboard hardware jumpers and DIP switches.
Can this board be hot-swapped while the system is powered on?
No. Always isolate 24V DC power to the cabinet before installing or removing the MC-603-01A to prevent voltage spikes that could damage sensitive logic gates.
What warranty is included with this PCB card?
Every NABCO MC-603-01A card supplied from our New Surplus stock includes a full 1-year functional replacement warranty.
