Larko Mark 4E circuit board
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The Larko Mark 4E is a gate‑operator control board used in swing‑gate and garage‑door systems. Common failure modes include degraded power‑supply rails (brownouts or overvoltage), blown input/output fuses, damaged ICs on the main logic chip, and relay contacts that have corroded or failed to actuate. First‑check diagnostics: verify 24 V DC supply stability with a multimeter; inspect all fuses and replace any that are blown; visually examine the board for burn marks, cracked solder joints, or damaged components; and review the gate controller’s diagnostic LED pattern or error code display for specific fault indications.[oss-gpt-20b] |
Need your Larko repaired or tested?
We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.
- ⚙️ Fast Diagnostics – Same-day evaluation available
- 🔁 Reliable Turnaround – Most jobs ship within 5–10 business days
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- 🔧 Board-level diagnostics (shorts, VRM, memory, fan, thermals)
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- ✅ 1-Year warranty on completed repairs
Free Estimates • Industrial-grade testing • 1-Year Warranty • Nationwide Service
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Industrial Electronic Repair
145 Rockwell Place Ct
Tobaccoville, NC 27050
🚑 Rush repair shipments only — no walk-ins.
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📦Mailing Address🚛
Industrial Electronic Repair
931-E S. Main St #204
Kernersville, NC 27284
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