Nice Apollo TB585A Encoder Board for M-BAR and L-BAR Barrier Operators
The Nice Apollo TB585A is the encoder board sub-assembly used in select M-BAR and L-BAR barrier gate operator service repairs. In these barrier systems, the encoder circuit provides position feedback from the motor/gearbox area to the operator control electronics, helping the control board understand where the barrier arm is during the open and close cycle.
This board is commonly searched when an M-BAR or L-BAR arm does not stop consistently, loses travel reference, faults during movement, or behaves differently after a motor or gearbox repair. Correct fitment matters because the encoder board works with the operator generation, motor feedback harness, and control board logic. A similar-looking board from another Nice barrier series should not be assumed to interchange unless the parts diagram confirms the same service number.
Compatible With
Use the list below as a fitment guide. Similar Nice Apollo barrier and slide gate parts can look alike, so the original part number, operator model, arm profile, and parts diagram should be checked before ordering.
- Select Nice Apollo M-BAR barrier gate operators
- Select Nice Apollo L-BAR barrier gate operators
- M/LBAR R10 encoder board service applications
- Barrier operator systems using the compatible BCU1 control platform and matching encoder harness
- Commonly associated with M3BAR, M5BAR, M7BAR, and LBAR service families when the parts diagram calls for TB585A
- Not intended as a replacement for unrelated Nice, Apollo, HySecurity, swing gate, or slide gate control boards
Features and Specifications
| Manufacturer | Nice Apollo |
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| Product Type | Encoder board / motor feedback board |
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| Part Number | TB585A |
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| Application | Barrier gate operator motor position feedback |
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| Compatible Operator Type | Select Nice Apollo M-BAR and L-BAR barrier operators |
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| Voltage | Low-voltage board signal circuit; verify by operator wiring diagram |
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| Safety Monitoring | Works as part of the operator control system; does not replace required safety devices |
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| Included Components | Encoder board sub-assembly only unless the supplier package states otherwise |
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| Notes | Confirm board number, harness connection, and operator family before ordering |
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Also Known As / Related Part Numbers
- TB585A
- NICE-TB585A
- NIC-TB585A
- Nice TB585A
- Apollo TB585A
- M/LBAR R10 encoder board
- M-BAR encoder board
- L-BAR encoder board
- MBar LBar encoder board
Technician Note
Encoder-related symptoms are not always caused by the encoder board alone. A loose harness, damaged motor, gearbox drag, incorrect arm balance, or control board fault can create similar travel errors, so the full barrier system should be checked before parts are replaced.
Before Ordering Checklist
- Match the TB585A part number to the existing encoder board or official parts diagram.
- Confirm the operator is an M-BAR or L-BAR family barrier operator.
- Inspect the motor feedback harness and connector before assuming the board is the only failed part.
- Check for mechanical binding, spring imbalance, or gearbox damage that can cause encoder-related symptoms.
- Do not bypass monitored safety devices or operate a damaged barrier arm during diagnosis.
Important Ordering Warnings
This is not a universal Nice Apollo control board. Verify TB585A against the operator parts diagram before replacing boards in M-BAR, L-BAR, WIDE, S-BAR, or other similar Nice barrier systems.
Professional Advisory
Barrier gate operators and slide gate operators can move heavy hardware and may include monitored safety devices, springs, drive components, and line-voltage wiring. For electrical diagnosis, unstable arm movement, damaged gate hardware, or missing safety protection, use a qualified gate technician.
Product Questions and Answers
What does the TB585A encoder board do?
The TB585A helps the compatible barrier operator read motor and arm position feedback during travel so the controller can manage movement, stopping, and cycle reference.
Does this board fit every Nice Apollo barrier gate?
No. It is used with select M-BAR and L-BAR service applications. Check the operator parts diagram and the original board number before ordering.
Can an encoder board cause inconsistent arm stopping?
It can be involved, but inconsistent stopping can also come from a loose harness, damaged motor, mechanical binding, spring imbalance, or a control board issue.
Is TB585A the same as the main control board?
No. TB585A is an encoder/feedback board, not the main BCU1-style barrier control board.
Should this board be installed by a technician?
A qualified gate technician is recommended when the operator has electrical faults, uncontrolled arm movement, or repeated travel errors.
