Just like the turntable indexing issue on Hole in One, when the mainboard loses track of the home optical pulse, the motor controller stutters as it attempts to re-calibrate its absolute zero point mid-cycle.
Sensor Placement & Architecture
To locate and service the Home Sensor, access the rear of the main wheel housing inside the upper cabinet marquee.
[REAR OF MAIN WHEEL ASSEMBLY]
│
┌────────────────────────────┴────────────────────────────┐
▼ ▼
[Outer Perimeter Tab] [Central Drive Hub]
│ │
┌─────────────┴─────────────┐ ┌─────────────┴─────────────┐
│ U-shaped photo-interrupter│ │ Optical encoder board │
│ mounted at 12 o'clock or │ │ mounted directly behind │
│ 6 o'clock on the frame. │ │ the stepper motor pulley. │
└───────────────────────────┘ └───────────────────────────┘
Outer Perimeter Indexing (Standard Setup):
Location: Mounted on the stationary backplate behind the wheel disc, usually fixed at the 12 o'clock or 6 o'clock position.
Mechanism: A metal or plastic actuator tab attached to the back of the rotating wheel passes through the gap of a U-shaped optical photo-interrupter (grooved IR sensor) once per complete revolution.
Central Axle Indexing (Drive Assembly Setup):
Location: Mounted directly onto the bracket housing behind the main drive pulley / motor shaft.
Mechanism: Reads a slotted timing disc mounted directly on the central axle to send both continuous pulse counts and a single home reference pulse back to the main CPU.
Why Sensor Failure Causes Stuttering & Wrong Scores
 |
| Sensor pada Super Match 2 terletak di belakang mesin |
The CPU determines which score segment the wheel lands on by counting stepper motor micro-steps relative to a known starting point.
Clean Signal (Normal): Every time the wheel completes a turn, the actuator tab breaks the IR beam on the Home Sensor. This sends a single $+5\text{V DC} \rightarrow 0\text{V DC}$ reset pulse to the CPU, resetting the step counter to absolute zero.
Dirty / Damaged Sensor (Fault): If dust, oil, or paper fibers block the IR emitter, or if the sensor chip fails, the CPU misses the reset pulse. The game engine realizes the step count does not match the expected index, causing the motor driver to jerk or stutter as it attempts to hunt for the missing home signal. As a result, the game registers the wrong target segment when the ball or pointer stops.
Step-by-Step Diagnostic & Cleaning Sequence
Quick Diagnostic Matrix: Super Match Wheel Errors
| Symptom | Primary Suspect | Action / Solution |
| Wheel stutters + Score incorrect | Dirty / Blocked Home Sensor | Clean sensor slot with IPA; verify tab passes centered through the gap. |
| Wheel rotates smooth + Score incorrect | Loose drive pulley set-screw or stretched belt | Tighten wheel hub mounting screws; adjust or replace drive belt. |
| Wheel locks up / Error code displayed | Defective Home Sensor IC or severed harness | Test signal toggling ($0\text{V}$ to $+5\text{V}$). Replace sensor module if voltage is static. |
| Scores correct + Tickets fail to pay | Ticket switch / dispenser motor | Test ticket notch sensor, roller grip, and dispenser drive logic ICs. |
