When servicing these cabinets in high-traffic entertainment centers, technicians frequently encounter three major categories of failure: incorrect scores/ticket payouts, tickets failing to dispense, and balls failing to elevate.
Below is a detailed diagnostic guide for identifying and resolving these cross-platform faults.
1. Score Errors & Inaccurate Ticket Payouts
In this failure scenario, the game registers incorrect score values or dispenses the wrong number of tickets compared to where the ball or target actually landed. Diagnostics depend on whether the play wheel (turntable) rotates smoothly or stutters.
[INACCURATE SCORE / TICKET PAYOUT]
│
┌─────────────────────────────┴─────────────────────────────┐
▼ ▼
[Play Wheel Rotates Stuttery / Jerky] [Play Wheel Rotates Smoothly]
│ │
┌─────────┴─────────┐ ┌─────────┴─────────┐
│ Check Yenox Optical│ │ • Check Drive Pulley/Belt│
│ Position Sensor │ │ • Test Stepper Motor │
└───────────────────┘ └──────────────────────────┘
Case A: Play Wheel Rotation Stutters or Jerks
Root Cause: Dirty, misaligned, or defective Yenox optical sensor.
Diagnostic Detail: The CPU uses the Yenox rotary sensor to calculate the exact timing and angular position of the score disk. When grime or dust coats the optical lenses, the sensor drops positioning pulses. The motor controller stutters as it tries to re-sync, causing the CPU to miscalculate which target segment was active when the ball dropped.
Fix: Clean the optical channel of the Yenox sensor using 99% Isopropyl Alcohol (IPA) and a cotton swab. If rotation remains erratic, verify the output signal voltage with a multimeter ($0\text{V}$ to $5\text{V}$ toggling); replace the sensor board if voltage remains static.
Case B: Play Wheel Rotates Smoothly, But Score Is Still Incorrect
If the wheel turns evenly without stuttering, the positioning sensor is receiving a clean signal, but mechanical slipping or motor torque loss is throwing off the physical alignment:
Worn, Stiff, or Stretched Drive Pulley Belt:
Over time, rubber drive belts lose elasticity, dry rot, or wear down.
When the motor starts or stops, the pulley slips against the belt. The motor turns, but the play wheel lags behind, creating a offset between the physical target and the CPU's internal position count.
Fix: Inspect pulley belt tension. Replace stretched or hardened rubber belts and clean oil/grease off the drive pulley wheels.
Weak or Damaged Stepper Motor:
Internal coil degradation or bearing drag inside the stepper motor causes it to skip steps under load.
Quick Field Test (Comparison Swap): Swap the suspect stepper motor with a known working motor from an adjacent machine. If the fault moves to the second machine, replace the stepper motor.
Loose Wheel Mounting Hardware:
Verify that set-screws securing the central play wheel hub to the drive shaft are tight. A slipping shaft hub causes position drift even with a healthy motor and sensor.
2. Tickets Not Dispensing
When players complete a game or hit a target but no tickets pay out, the failure can stem from the initial physical hit detection down to the PCB driver logic.
Primary Causes & Diagnostic Steps
Faulty or Disconnected Score Outlet Needle Switch:
Symptom: Target hole is hit, but the score display does not update and no payout signal is generated.
Fix: Inspect the whisker/needle microswitch inside the target chute. Check if the wire lever is bent, snapped, or if the harness socket has vibrated loose. Measure continuity across the COM and NO terminals while pressing the arm; replace the switch if resistance exceeds $0\,\Omega$.
Defective or Jammed Ticket Dispenser Module:
Symptom: Mainboard triggers payout (display shows score or error code
HLP/Err-Tk), but tickets fail to feed.Fix: Inspect rubber drive rollers for paper dust or wear. Clean the optical notch sensor using compressed air and IPA. Check $+12\text{V DC}$ motor supply wires.
Damaged Mainboard Logic IC (e.g., 74HC245 or ULN Driver):
Symptom: Ticket dispenser motor and needle switches test fine on a bench setup, but the mainboard fails to read inputs or fire the dispenser output.
Fix: Trace circuit traces from the cabinet harness header to the board buffer chips. Replace burned 74HC245 TTL buffer ICs or ULN2003/2803 Darlington driver arrays.
3. Balls Fail to Elevate / Balls Not Rising
In games like Slam A Winner and Ocean Park, an elevator mechanism (motorized vertical vanbelt or corkscrew lift) raises balls from the bottom collection bin to the top release tray.
[BALLS FAIL TO ELEVATE]
│
┌─────────────────────────────────┼─────────────────────────────────┐
▼ ▼ ▼
[Ball Standby Switch] [Vanbelt / Roller Slippage] [Elevator Drive Motor]
│ │ │
┌─────┴─────┐ ┌─────┴─────┐ ┌─────┴─────┐
│ Test COM │ │ Inspect │ │ Test power│
│ to NO/NC │ │ tension, │ │ input & │
│ continuity│ │ check for │ │ Compare │
│ & socket │ │ snapped │ │ motor to │
└───────────┘ │ vanbelt │ │ next bay │
└───────────┘ └───────────┘
Primary Causes & Diagnostic Steps
Malfunctioning Ball Standby Switch:
How it Works: A microswitch located at the bottom of the ball hopper detects when a ball is waiting to be lifted. If this switch does not close, the CPU assumes no balls are present and will not energize the elevator motor.
Fix: Inspect the standby switch lever for physical binding. Check for loose harness sockets. Measure continuity across the switch terminals when a ball rests against the lever.
Snapped or Slipping Vanbelt Assembly:
Symptom: Elevator motor spins, but the lifting belt does not move or stalls when loaded with balls.
Fix: Inspect the vertical vanbelt for snaps or tears. Clean accumulated grease from drive rollers. Adjust belt tensioning brackets so the roller grips the belt without binding the motor shaft.
Faulty Elevator Stepper / Drive Motor:
Symptom: Elevator motor hums, gets hot, or remains completely stationary when energized.
Fix: Check power input ($+12\text{V DC}$ or $+24\text{V DC}$ depending on cabinet model). Swap the motor assembly with an adjacent working machine bay to confirm winding failure.
Master Troubleshooting Reference Table
| Machine Model | Problem | Suspect Component | Quick Field Test / Solution |
| Hole in One / Slam A Winner / Ocean Park | Inaccurate score / jerky wheel | Yenox Optical Sensor | Clean optical gap with 99% IPA. Check output signal pin for $0\text{V}$–$5\text{V}$ toggling. |
| Hole in One / Slam A Winner / Ocean Park | Inaccurate score / smooth wheel | Drive Pulley / Stepper Motor | Check belt tension and shaft set-screws. Swap stepper motor with adjacent unit to verify. |
| Hole in One / Slam A Winner / Ocean Park | Tickets not dispensing | Target Needle Switch / TTL IC | Test COM $\rightarrow$ NO continuity on score switch. Inspect 74HC245 logic chip on PCB. |
| Slam A Winner / Ocean Park | Balls fail to elevate | Standby Switch / Vanbelt | Verify hopper standby switch closes when ball is present. Inspect elevator belt tension and drive rollers. |
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