Maddox Enterprises MEI-039-900D Relay/Power supply board Repair Service

Professional diagnostic and board-level repair service for this Maddox Enterprises MEI-039-900D Relay/Power supply board.

The MEI‑039‑900D is a relay and power‑supply module used in Maddox Enterprises industrial control systems to provide isolated coil drive and regulated DC output (typically 5 V via a 7805 regulator). Common failure points for this class of boards include burned or tripped relays, degraded bridge rectifier diodes, overheating of the voltage regulator, and loose solder joints on the relay driver traces. First‑check diagnostics: verify input AC voltage and correct polarity; test the output rails with a multimeter to confirm 5 V regulation; visually inspect for burnt components or cracked PCB pads, especially around the relay coil contacts and rectifier area. Post Comment

Need your Maddox Enterprises MEI-039-900D Relay/Power supply board repaired?

Ship your unit to our North Carolina repair shop for component-level diagnostics and a repair estimate. We service industrial control electronics and power systems nationwide.

• ⚙️ Board-level diagnostics – Troubleshooting beyond simple module replacement
• 🔁 Clear approval process – No repair begins without your approval
• 🧰 Expert Technicians – Decades of board-level experience
• ✅ 1-Year Warranty – Included with completed repairs

Start a Repair Request   Call 1-336-969-0110

Nationwide service • Industrial-grade testing • 1-year warranty on completed repairs

Owner-Operated • Practical Pricing • 1-Year Warranty • Nationwide Service

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