Linear Pro Access LOCKPCB Automatic Gate Lock Control Board for FM144 and Mighty Mule FM143 Locks
The LOCKPCB is the replacement lock control board used with the FM143/FM144 electric automatic gate lock family. In a working automatic gate lock installation, the board helps coordinate the release of the lock before the operator starts moving the gate and helps the lock re-secure when the gate closes against the proper stop. A bad board may show up as a gate that tries to move while still locked, a lock that does not trigger consistently, or a lock control circuit that has been damaged by moisture, wiring faults, or age. Because automatic gate locks rely on good alignment and proper sequencing, the board should be replaced only after confirming that the lock body, lock pin, bracket position, power source, and operator output are correct.
Compatible With
Compatible Lock Models
- Mighty Mule FM143 electric automatic gate lock
- Linear Pro Access FM144 electric automatic gate lock
- GTO/PRO automatic gate lock assemblies sold under the FM143/FM144 family
- Bulldog automatic gate lock references only when specifically tied to the FM143/FM144 lock control board family
Common Operator Applications
- Single swing gate operators using an FM143/FM144 lock and compatible lock output
- Dual swing gate systems using proper gate sequencing so the locked leaf opens and closes in the correct order
- GTO, Mighty Mule, and Linear Pro Access gate opener installations where the lock manual calls for this board
Use Caution With
- Pedestrian FM145 Bulldog gate locks, which are a separate product family
- Locks with damaged solenoids, broken wiring, or mechanical misalignment
- Custom lock wiring or older control boards with different connector layouts
Features and Specifications
| Manufacturer | Linear Pro Access / GTO / Mighty Mule |
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| Product Type | Automatic gate lock control board |
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| Part Number | LOCKPCB |
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| Related Service Number | R4483 commonly referenced with this board family |
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| Application | FM143/FM144 electric automatic gate lock service replacement |
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| Voltage | 12V DC lock-control application when used in the proper lock assembly |
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| Compatible Operator Type | Swing gate operators using the FM143/FM144 automatic gate lock |
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| Notes | Board replacement does not correct lock misalignment, missing stops, or incorrect dual-gate sequencing |
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Also Known As / Related Part Numbers
- LOCKPCB
- LOCK PCB
- R4483
- FM143 lock board
- FM144 lock board
- Mighty Mule LOCKPCB
- GTO LOCKPCB
- Linear Pro Access LOCKPCB
- automatic gate lock control board
Technician Note
Before replacing the LOCKPCB, confirm the gate closes firmly against a positive stop and that the lock pin enters the receiver cleanly. A misaligned lock can mimic a failed board and can damage the gate opener.
Before Ordering
- Confirm the lock model is FM143 or FM144.
- Compare the old board and connector layout to the replacement.
- Check lock wiring for cuts, corrosion, or loose terminals.
- Verify the gate has a proper positive stop and correct lock alignment.
- On dual gates, verify the programmed sequencing before cycling the system.
Professional Advisory
Automatic gate lock wiring and sequencing should be handled carefully. If the gate tries to move while locked, stops hard, or has high-voltage wiring concerns nearby, have a qualified gate technician inspect the system.
Questions and Answers
What lock models use the LOCKPCB board?
The LOCKPCB is used with the FM143 and FM144 automatic gate lock family, including Mighty Mule, GTO, and Linear Pro Access branded versions.
Is LOCKPCB the same as R4483?
R4483 is commonly searched and referenced with the LOCKPCB lock control board family. Match the original board and lock model before treating it as a direct replacement.
What does this board do in the gate lock?
It controls the timing and operation of the electric automatic gate lock so the lock releases and re-engages in the correct sequence with the gate opener.
Can this board fix a lock that will not release?
It can help when the original lock board has failed, but lock alignment, wiring, battery condition, operator sequencing, and the positive stop should also be checked.
Should the gate lock be bypassed if the board fails?
No. Do not bypass required lock or safety wiring to keep the gate running. A failed lock control board should be replaced or diagnosed by a qualified gate technician.
