Understanding & Troubleshooting Arcade Photo Sensors (Infrared TX-RX) and Vibration Sensors

In arcade engineering, photoelectric sensors (photo sensors) and vibration/impact sensors are fundamental input devices. They detect ball passes, coin/token drops, target hits, and gun recoil feedback.

Understanding how these sensors operate—and mastering quick diagnostic techniques using LED indicators, multimeters, and smartphone cameras—allows field technicians to quickly resolve scoring faults across various game types.

Pemancar dan penerima inframerah ini disebut sebagai pasangan IR TX-RX

1. What is an Infrared Photo Sensor (IR TX-RX)?

An optical photo sensor detects objects using infrared light emitted at specific wavelengths outside the visible spectrum. The system operates as a matched pair:

• IR Transmitter (TX): An Infrared Light Emitting Diode (LED) that continuously broadcasts an invisible infrared light beam.

• IR Receiver (RX): A phototransistor or photodiode that detects the presence or interruption of the emitted infrared beam.

infrared sensor module

infrared sensor module

 

Photo sensor | infra red

Sensor Types & Configurations:

1. Through-Beam / Direct Pass: TX and RX are mounted on opposite sides of a channel or lane (e.g., scoring gates, ticket notch readers).

2. Reflective Type: The TX and RX are housed inside a single unit, firing an IR beam against a dedicated reflector mirror/plate on the opposite side.

3. Diffused Reflective (No Reflector): The sensor bounces the IR beam directly off passing target objects (e.g., basketballs, plastic targets).

2. Quick Diagnostic Methods for Optical Photo Sensors

Field technicians can test photo sensor health without removing the board using three simple diagnostic methods:

                  ┌─────────────────────────────────────────┐
                  │       PHOTO SENSOR DIAGNOSTIC FLOW      │
                  └────────────────────┬────────────────────┘
                                       │
        ┌──────────────────────────────┼──────────────────────────────┐
        ▼                              ▼                              ▼
 [ 1. LED INDICATOR TEST ]    [ 2. MULTIMETER OUT VOLTAGE ]   [ 3. CAMERA TX BEAM TEST ]
 Observe state change on PCB  Measure OUT pin to GND          View IR TX LED via phone
 LED: OPEN vs CLOSE           0V vs 5V (Active LOW / HIGH)    Purple glow = Emitting OK

Method 1: LED State Indicator (NO / NC Logic)

Most arcade sensor modules include an onboard diagnostic LED indicator that functions like a Normally Open (NO) or Normally Closed (NC) switch contact:

• Active-Low Configuration:

  • Unblocked Beam (OPEN): Indicator LED is OFF → Output signal is High ($\approx 5\text{V DC}$).

  • Blocked Beam (CLOSE): Target cuts beam → Indicator LED turns ON → Output signal pulls Low ($\approx 0\text{V DC}$).

• Active-High Configuration:

  • Unblocked Beam (OPEN): Indicator LED is ON → Output signal is Low ($\approx 0\text{V DC}$).

  • Blocked Beam (CLOSE): Target cuts beam → Indicator LED turns OFF → Output signal pulls High ($\approx 5\text{V DC}$).

• Diagnosis: If blocking the sensor changes the LED state predictably, the sensor optical trigger is functioning.

Method 2: Voltmeter / Multimeter Signal Measurement

To confirm the signal reaches the CPU/mainboard logic circuit:

1. Connect the multimeter Black Probe to Ground (GND).

2. Place the Red Probe on the sensor's Signal Output (OUT / DRIVE) pin while supplying power (+5V or +12V).

3. Test State Change:

   • Clear Path: Voltage reads 5V DC (or 0V depending on active mode).

   • Blocked Path: Pass a card or object through the beam; voltage drops instantly to 0V DC (or jumps to 5V).

• Diagnosis: If voltage remains stuck at 5V or 0V regardless of object presence, the phototransistor or output pull-up resistor is damaged.

Method 3: Testing IR Emitters (TX) with a Smartphone Camera

Because human eyes cannot see infrared light, verifying whether an IR Emitter LED is burnt out can be difficult.

• Procedure: Open your smartphone's camera app (front-facing selfie cameras often work best as they lack strong IR blocking filters) and point it directly at the IR Transmitter (TX) LED eye.

• Result: A functional IR Emitter appears as a glowing violet/purple light on the phone screen. If no light shows, the TX LED is dead, unpowered, or has broken wiring.

3. Vibration Sensors in Arcade Machines

In addition to optical photo sensors, arcade games frequently utilize vibration sensors (piezoelectric / spring-ball impact sensors) to register mechanical collisions or physical play.

       [ Spring-Ball Vibration Sensor ]           [ Piezoelectric Impact Sensor ]
          Outer Metal Casing                        Piezo Ceramic Disc
             ┌──────────┐                               ┌──────────┐
             │  Spring  │                               │  Piezo   │
             │   (o) <──┼─ Floating Contacts            │ Element  │
             └────┬─────┘                               └────┬─────┘
                  │                                          │
       Shaking/Impact closes contact            Vibration generates micro-voltage spike

• Application Examples: Target shooting games (Police Action gun recoil and cabinet shake detection), carnival hammer/redemption games (Yenox Happy Zoo animal target hits), and pinball tilt mechanisms.

• Mechanism:

  1. Spring-Ball Type: A metallic ball inside a spring cage moves during vibration, momentarily bridging contacts to pull a signal pin to GND.

  2. Piezoelectric Type: Physical impacts flex a ceramic element, generating a small analog voltage pulse processed by an operational amplifier (Op-Amp) circuit on the PCB.

4. Platform Troubleshooting Case Studies

A. Happy Forest (Photo Sensor / Ticket Sensor Faults)

• Symptom: Balls fall into scoring holes, but no score registers on the display.

• Root Cause: Dust and paper fibers from ticket rolls coating the IR lenses, or a dead IR Emitter LED.

• Fix: Clean the IR TX and RX eyes using 70%+ Isopropyl Alcohol and a microfiber swab. Test TX output with a smartphone camera.

B. Police Action (Gun Sight Optics & Impact Vibration Sensors)

• Symptom: Gun screen tracking misses targets, or recoil feedback triggers false "tilt/vibration" errors.

• Root Cause:

  1. Optical Sight Tracking: IR LEDs along the screen bezel are dirty, misaligned, or obscured by bezel acrylic.

  2. Vibration Sensor: The gun stock internal vibration/impact sensor spring has fatigued or oxidized, leaving contacts permanently closed.

• Fix: Re-align screen edge IR transmitter LEDs. Disassemble the gun housing, clean spring-ball vibration sensor contacts with contact cleaner, or adjust the sensitivity potentiometer on the impact amplifier board.

C. Yenox Happy Zoo (Target Hit Photo & Vibration Sensors)

• Symptom: Hitting animal targets does not yield points, or one specific target scores continuously without being struck.

• Root Cause: Mechanical target arms failing to break the through-beam photo interrupter, or a shorted vibration sensor module mounted on the target frame.

• Fix: Inspect the physical target return spring to ensure the mechanical flag fully breaks the photo sensor gap when at rest. Check the sensor's signal wire voltage using a multimeter to confirm a clean $0\text{V}\leftrightarrow 5\text{V}$ transition upon impact.

📌 Sensor Troubleshooting Summary Table

Sensor Category	Detection Method	Diagnostic Technique	Common Fault & Fix
Infrared Photo Sensor (TX-RX)	Optical Beam Cut / Reflection	1. Phone Camera (check purple TX glow) 2. Multimeter ($0\text{V}\leftrightarrow 5\text{V}$ check)	Dust buildup or dead TX LED $\to$ Clean lenses; replace TX LED
U-Shape Photo Interrupter	Direct Slot Obstruction	Check onboard PCB diagnostic LED (OPEN vs CLOSE)	Paper dust in slot $\to$ Clean slot with IPA & cotton swab
Vibration / Impact Sensor	Physical Collision / Shake	Continuity/Voltage test across contacts while shaking cabinet	Oxidized spring or shorted contacts $\to$ Clean w/ contact cleaner or replace module

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In street basketball arcade games, precise score tracking relies on a fast, reliable detection mechanism. The heart of this system is the infrared (IR) sensor module. Understanding how these sensors operate, how they are installed, and how to troubleshoot them ensures your machines stay fully operational, keeping player engagement high and maintenance downtime low.

The Core Principle: Beam Interruption Detection

An infrared sensor system uses infrared light as the transmission medium between an emitter (transmitter) and a receiver.

Unlike standard optical sensors that constantly search for a reflecting signal, an arcade basketball sensor operates on the principle of beam interruption:

1. The transmitter continuously projects an invisible infrared beam toward a target point.

2. Under normal conditions, the receiver constantly detects this light beam.

3. When a basketball passes through the hoop, it blocks the infrared beam.

4. The sudden loss of signal alerts the main control board to register a successful score.

[IR Transmitter] ---- (Infrared Beam) ----> [Reflector / Receiver]
                                 |
                          [Basketball Passes]
                                 |
                       (Beam Blocked = Score!)

Sensor Installation & Hardware Configuration

Street basketball arcade sensors are custom-engineered into consolidated single-module units built to withstand constant vibration and environmental exposure.

A standard basketball hoop installation consists of:

• 2 Sensor Modules: Mounted strategically along the rim to cover the basket's entry zone accurately.

• 1 Reflector: Positioned directly opposite or aligned with the modules to bounce back or complete the beam path.

This multi-sensor setup prevents false triggers—such as a player’s hand grazing the net—and ensures that only an object with the full diameter of a basketball breaks the beam paths to trigger a point.

How to Test and Diagnose Basketball Hoop Sensors

Testing your IR sensor module is simple and requires no specialized equipment. You can verify its functionality using a manual hand test while observing the module’s LED status indicators.

Step-by-Step Manual Test Procedure:

1. Power On: Ensure the arcade machine is powered on and in standby mode.

2. Block the Beam: Place your hand directly in front of the sensor module to interrupt the infrared beam.

3. Unblock the Beam: Remove your hand to let the signal reconnect.

4. Observe the LED: Watch the indicator LEDs on the back or side of the sensor module during both states.

Decoding LED Status (NO vs. NC Configurations)

Depending on the manufacturer, the sensor module will display different LED patterns to indicate state changes:

Configuration / Type	Beam Unblocked (Normal)	Beam Blocked (Hand / Ball)
Standard Single LED (NO)	LED OFF	LED ON
Standard Single LED (NC)	LED ON	LED OFF
Dual-LED Indicator (Common)	Green or Red LED (NC/Idle)	Yellow or Green LED (NO/Triggered)

Note: Consult your machine’s service manual if the LED behavior does not match standard Normally Open (NO) or Normally Closed (NC) switching logic.

Common Sensor Failure Modes & Quick Fixes

When a basketball goes through the hoop but the machine fails to register points, the infrared sensor system is usually the main culprit. Here are the most common issues and how to resolve them:

1. Dirty or Misaligned Reflector

• Symptom: Points fail to register, or points register continuously without a ball passing through.

• Cause: Dust, grease, or fingerprints on the reflector surface scatter the infrared beam.

• Fix: Wipe the reflector lens and sensor module face with a micro-fiber cloth and mild glass cleaner. Ensure the reflector is precisely aligned with the sensor optical axis.

2. Broken or Loose Wiring Harness

• Symptom: LED indicators stay completely unlit regardless of hand testing.

• Cause: Constant vibration from rim impacts can loosen connector pins or snap signal/power wires inside the harness.

• Fix: Check continuity using a digital multimeter. Resolder severed wires or replace the wiring harness assembly.

3. Module Physical Damage or Component Degradation

• Symptom: LED indicators flicker inconsistently or fail to change state when the beam is broken.

• Cause: Internal IR diode degradation or structural damage from heavy ball impacts.

• Fix: Replace the faulty sensor module with an OEM-compatible unit.

Keep Your Arcade Machines Revenue-Ready

A non-scoring basketball game leads to frustrated players and lost revenue. By performing routine checks on your infrared sensor modules—cleaning reflectors, inspecting cables, and verifying LED indicator states—you can prevent unexpected downtime and maintain peak equipment performance.

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