In street basketball arcade games, Stage 2 introduces increased difficulty by activating the moving rim mechanism (ring basket bergerak). The basket rim sways horizontally from left to right to challenge the player's timing and accuracy.
A very common mechanical failure during Stage 2 is "Ring Tidak Gerak" (The Hoop Fails to Move) while the game music and timer continue normally. Here is a step-by-step guide to diagnosing this issue, identifying loose motor mounting bolts, and performing a permanent fix.
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| stage 2 ring tidak gerak |
How the Moving Rim Mechanism Works
The horizontal movement of the basketball rim relies on a mechanical drive system driven by a gear motor behind the backboard.
[AC / DC Gear Motor] ---> [Crank Arm / Linkage] ---> [Moving Rim Assembly]
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[Mounting Bolts] [Position Sensors]
(Holds Motor to Frame) (Left/Right Limits)
Activation Signal: When the player reaches Stage 2 (or a specific score threshold), the mainboard sends power to the rim drive motor.
Mechanical Linkage: The motor rotates a crank arm connected to a push-rod or slider linkage, translating rotational motion into side-to-side linear sliding.
Limit Feedback: Left and right limit sensors detect the end positions to ensure smooth direction reversals or continuous oscillation.
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| Motor ring basket bautnya lepas |
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| Motor ring basket bautnya lepas |
Root Cause Analysis: Loose or Missing Motor Mounting Bolts (Baut Motor Ring Basket Lepas)
Because street basketball machines endure non-stop physical impacts from heavy basketballs hitting the rim and backboard, vibration is the primary enemy of mechanical fasteners.
Heavy Ball Impact on Rim
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High-Frequency Mechanical Vibration
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Motor Mounting Bolts Loosen / Back Out
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Motor Shifts Position / Disengages Gears
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[Stage 2: Motor Spins, but Rim Remains Stationary]
What Happens When Motor Bolts Come Loose:
Gear Disengagement: As the mounting bolts backing the motor bracket loosen, the motor shifts away from the drive linkage or gear teeth. The motor spins internally, but no torque reaches the rim linkage.
Mechanical Jamming: A partially backed-out bolt can catch on surrounding brackets, physically locking the crank arm and preventing rotation.
Wiring Strain: If the motor drops completely off its mounting plate, its weight hangs on the electrical harness, risking snapped wires or short circuits.
Step-by-Step Diagnostic & Repair Procedure
Follow this technical workflow to inspect, secure, and test the Stage 2 rim movement mechanism:
[Fault: Stage 2 Starts, but Rim Does Not Move]
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[Access Backboard Rear Drive Housing]
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+---------------+---------------+
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[Motor Bolts Loose / Fallen] [Motor Bolts Tight]
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v v
Re-align Motor & Apply Test Motor Voltage (12V/24V/110V)
Threadlocker (Loctite 242) & Relay Output on Mainboard
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v v
Tighten Lock Washers & Bolts Check Limit Sensors & Cables
1. Accessing the Motor Housing
Power off the machine and disconnect the main power cable for safety.
Open the back access door behind the backboard display cabinet.
Locate the rim motor assembly attached to the rear structural steel frame.
2. Inspecting and Re-mounting the Motor
Check Bolt Condition: Inspect the 3 or 4 main mounting bolts holding the gear motor bracket to the cabinet frame.
Inspect the Linkage: Verify whether the crank arm pin, bushings, or connecting rods suffered deformation due to the motor shifting angle.
Apply Medium-Strength Threadlocker:
Clean the bolt threads of oil, dust, and metal filings.
Apply 1–2 drops of blue threadlocker (e.g., Loctite 242) to each bolt thread. This prevents future loosening caused by severe ball vibration.
Use Lock Washers / Nylon Lock Nuts: Always install spring lock washers or nylon insert lock nuts underneath the bolt heads for vibration damping.
Torque Down Securely: Re-align the motor drive pinion with the linkage arm and tighten all mounting bolts firmly using a socket wrench.
3. Functional & Limit Sensor Testing
Power on the basketball machine and enter Service / Test Mode.
Run the Motor Test / Moving Rim Test from the service menu.
Observe the movement:
The rim should slide smoothly from left to right without gear grinding, squeaking, or physical resistance.
Verify that the Left Limit and Right Limit position sensors light up cleanly at each end of the movement cycle.
Run a trial game into Stage 2 to confirm the rim begins swaying automatically when Stage 2 starts.
Preventative Maintenance Checklist: Moving Rim Assembly
To prevent unexpected Stage 2 failures during peak operating hours in malls, perform these checks during routine servicing:
| Maintenance Task | Recommended Frequency | Action |
| Motor Bolt Tightness | Monthly | Check mounting bolt torque; re-apply threadlocker if loose. |
| Linkage Lubrication | Bi-weekly | Apply lithium grease or Teflon spray to sliding rails and crank joints. |
| Limit Sensor Alignment | Monthly | Inspect proximity/limit switches on left and right stops for dust buildup. |
| Wiring Harness Inspection | Monthly | Ensure motor power wires are strain-relieved with zip ties away from moving arms. |
Master Summary: Common Street Basketball Mechanical & Electrical Faults
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| STREET BASKETBALL TROUBLESHOOTING QUICK REFERENCE TABLE |
+----------------------+--------------------------+---------------------------------+
| Symptom | Primary Root Cause | Key Technical Fix |
+----------------------+--------------------------+---------------------------------+
| No Score Registered | Dirty/Broken IR Sensor | Clean reflector; check NO/NC LED|
| Gate Moves Continuously| Broken Sensor Harness | Repair cable; adjust gap to 2mm |
| Stage 2 Rim Static | Loose Motor Mounting Bolts| Apply Loctite 242; tighten bolts|
| Balls Not Elevator-Fed| Fallen Hologram Reflector| Re-stick hologram plate; clean |
+----------------------+--------------------------+---------------------------------+
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