Create a comprehensive troubleshooting summary table combining all covered machines (HockeyZoo, Slam A Winner, Hole in One).

 Here is a comprehensive troubleshooting summary table combining all the diagnostic cases, root causes, and solutions covered across HockeyZoo, Slam A Winner, and Hole in One.

Master Troubleshooting & Repair Matrix

Game Title	Symptom / Reported Issue	Root Cause	Failure Analysis	Recommended Diagnostic & Repair Action
HockeyZoo	Unreadable score / LED display fails to update when a goal is scored	Dirty or defective Yenox optical sensor near goal line	Dust/paper lint blocks optical IR beam gap, or IR LED inside Yenox housing degraded	Clean sensor channel with 99% IPA using a cotton swab. If voltage across signal pin fails to toggle (0V to 5V), desolder and replace the Yenox sensor board.
Slam A Winner	Stuttering / jerky score wheel (turn table) rotation	Dirty or defective Yenox rotary sensor	Grime on optical lenses prevents precise timing gear/target disk tracking, causing controller hesitation	Clean Yenox optical gap and timing gear. Check signal pin output with a multimeter; replace Yenox module if signal toggling remains erratic.
Slam A Winner	Multi-system fault: Coin slot unresponsive, turn table stutters, and ball elevator vanbelt stutters simultaneously	Damaged 74HC245 TTL Logic IC on mainboard PCB	Static electricity or voltage spikes damaged the input buffer IC, blinding the CPU to external inputs	Verify wiring continuity to PCB. Trace input lines to the 74HC245 IC. Desolder the faulty chip, install a 20-pin DIP socket, and insert a new 74HC245 buffer IC.
Slam A Winner	Ticket dispenser fails to pay out tickets (Error code displayed / motor spins endlessly)	Jammed paper path or dirty/faulty IR ticket notch sensor	Roller build-up prevents paper feed, or optic sensor fails to register ticket notches to CPU	Clear paper jam and clean rubber rollers with IPA. Clean optical notch sensor channel; if the status LED on the dispenser board doesn't flash during feed, replace the ticket sensor board.
Slam A Winner	Score not registered and no tickets dispensed when ball enters target chute	Misaligned, oxidized, or broken Needle (Whisker) Switch	Bended needle misses ball impact, or contact oxidation prevents electrical continuity across COM $\rightarrow$ NO	Inspect needle position in chute. Test switch with multimeter in resistance mode (COM to NO); if reading exceeds $0\,\Omega$ when manually pressed, adjust arm or replace switch.
Hole in One	Score unread upon ball entry; ticket payout is delayed until game timer expires	Broken Needle Switch in scoring hole/cup	Snapped wire lever prevents score pulse. CPU holds until game timer expires, then issues fallback Mercy Tickets	Inspect target switch lever. Verify COM to NO continuity with multimeter. Replace broken whisker switch and verify DIP switch timer configuration on PCB.

Quick Diagnostic Reference Checklist for Arcade Technicians

                                  [SYSTEM ISSUE DETECTED]
                                             │
               ┌─────────────────────────────┴─────────────────────────────┐
               ▼                                                           ▼
     [Mechanical/Optical Sensor Issue]                            [Mainboard Signal Fault]
               │                                                           │
 ┌─────────────┴─────────────┐                               ┌─────────────┴─────────────┐
 │ • Clean Yenox/IR Lens     │                               │ • Test wiring continuity  │
 │ • Test COM to NO/NC Switch│                               │ • Check 74HC245 Buffer IC │
 │ • Check needle alignment  │                               │ • Inspect DIP switch map  │
 └───────────────────────────┘                               └───────────────────────────┘

1. Optical Sensors (Yenox / IR): Always clean lenses with 99% Isopropyl Alcohol (IPA) before condemning hardware.

2. Microswitches (Needle / Whisker): Measure continuity across COM and NO terminals while manually actuating the arm. It should drop cleanly to near $0\,\Omega$.

3. Multi-Input Failures: If independent switches and sensors fail simultaneously, check power rails ($+5\text{V}$, $+12\text{V}$) and signal buffer ICs (74HC245) on the mainboard PCB.