One of the most common mechanical faults in street basketball arcade machines is a ball gate (pintu gerbang bola) that continuously moves up and down without stopping.
When the ball gate cycles endlessly, the machine cannot lock into play mode or standby mode, rendering the game unplayable. Here is a technical breakdown of why this happens, how to isolate the root cause, and how to repair the sensor system.
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| Street basketball |
How the Ball Gate Mechanism Works
The ball gate relies on a motor driven by a limit switch or proximity sensor feedback loop. The game control board relies on two critical position signals:
Gate OPEN Position (Up): Signals the mainboard to stop the motor when the gate reaches the top, allowing balls to roll to the player.
Gate CLOSED Position (Down): Signals the mainboard to stop the motor when the gate reaches the bottom at game over.
+------------------------+
| GAME CONTROL BOARD |
+-----------+------------+
|
+---------------+---------------+
| Command Motor | Read Position |
v v v
[Gate Motor] <---> [Ball Gate] ---> [Position Sensors]
(Upper & Lower Limit)
The Core Problem: If the control board never receives the signal from the position sensor (because the sensor is damaged or a wire is severed), it assumes the gate has not reached its target position yet. As a result, it keeps driving the motor indefinitely, causing the gate to move up and down continuously.
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| Sensor trouble / kabel putus |
Primary Causes of Continuous Gate Movement
| Root Cause | Specific Defect | Impact on Machine |
| Wiring Harness Failure | Broken/severed sensor signal or power wire inside the flex cable | Board receives 0V / no signal from position sensors. |
| Sensor Hardware Defect | Damaged inductive/capacitive proximity switch or mechanical limit switch | Sensor fails to trigger even when the gate flange passes by. |
| Physical Misalignment | Loose mounting bracket shifted due to mechanical vibration | Sensor distance exceeds maximum sensing range ($>5\text{ mm}$). |
| Debris Accumulation | Metal dust or grease buildup on inductive sensor face | Sensor gets stuck in continuous ON or OFF state. |
Step-by-Step Sensor Inspection & Diagnostic Procedure
Follow this troubleshooting sequence to isolate whether the issue is a failed sensor, broken wiring, or mechanical alignment error:
[Fault: Ball Gate Moves Up & Down Continuously]
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v
[Inspect Gate Position Sensors]
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+---------------+---------------+
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[LED Indicator OFF] [LED Indicator ON]
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v v
Check Wiring & Supply Manually trigger sensor
Voltage (10-30V DC) with metal plate / object
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+----+----+ +----+----+
| | | |
[No Volt] [Power OK] [Toggles] [Stuck State]
| | | |
v v v v
Fix Cable Sensor Defect Check Gate Replace Sensor
Harness (Replace) Alignment Module
1. Visual Inspection & LED Status Check
Locate the Upper Limit and Lower Limit sensors mounted on the gate crank/lever assembly inside the cabinet.
Power on the machine and manually cycle the gate lever toward each sensor:
Normal State: The sensor LED should light up (or turn off, depending on NO/NC configuration) as the metal actuator plate passes the sensing face.
Fault State 1 (No Power): The LED remains unlit at all times $\rightarrow$ Indicates a broken wire or power loss.
Fault State 2 (No Sensing): The LED stays in one state regardless of gate position $\rightarrow$ Indicates internal sensor failure or excessive gap.
2. Wiring Harness & Voltage Test
Because the gate mechanism vibrates intensely during movement, copper wires often snap inside the insulation near movement joints.
Set your multimeter to DC Volts ($V_{DC}$).
Check power supply across VCC (Brown) and GND (Blue) wires at the sensor plug:
Expect 10–30V DC (or 5V DC depending on board architecture).
Check signal wire voltage across Signal OUT (Black) and GND (Blue) while manually placing a metal object in front of the sensor face:
Target Present: Should read 0V (or VCC voltage depending on active-low/high logic).
Target Absent: Should read 5V / VCC (or 0V).
If voltage does not change during the manual target test, test wire continuity back to the main control board. Resolder or replace any severed wires in the cable harness.
3. Sensor Gap & Mechanical Realignment
Inductive proximity sensors typically require a sensing distance of $1\text{ mm}$ to $4\text{ mm}$.
Check if mechanical vibration has loosened the mounting nuts.
Re-adjust the gap between the metal actuator arm and the sensor face to approximately $2\text{ mm}$.
Firmly tighten the lock nuts and secure the wire harness with zip ties to prevent cable strain during gate movement.
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| Gate bola streetbasket ball |
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| Gate bola streetbasket ball |
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| Inisialisasi pin input |
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| Inisialisasi komponen |
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| Inisialisasi komponen, Led sensor miring |
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| Cara kerja sensor sinar infra red dari transmiter (tx) ke reciever (rx) harus lurus |
Sensor Repair & Maintenance Summary Table
+-----------------------------------------------------------------------+
| BALL GATE SENSOR SERVICE SUMMARY |
+-------------------+---------------------------------------------------+
| Component | Inductive Proximity Switch / Limit Switch |
| Operating Volts | 10–30V DC (Standard Arcade Board Logic) |
| Normal Behavior | LED toggles state when metal flag hits limit point |
| Failure Symptom | Gate moves up/down infinitely without stopping |
| Quick Solution | 1. Re-solder severed flex cable wires |
| | 2. Re-align sensing gap to 2mm |
| | 3. Clean metallic dust off sensor face |
| | 4. Replace sensor if internal driver is blown |
+-------------------+---------------------------------------------------+
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