Monster Drop Arcade Repair: Ball Fails to Rise / Empty Ball Chamber Fault

Monster Drop by Benchmark Games is one of the highest-revenue ticket redemption arcade games in the industry. The gameplay revolves around dropping a physical ball through a rotating rim onto a high-value ticket wheel.

Mesin redemption monster drop

A frequent technical fault reported by field technicians is "Bola Tidak Naik" (Ball Fails to Elevate / Chamber Empty). When this occurs, the game cannot feed balls to the launcher mechanism, bringing play to a complete halt.

Plat hologram utk sinyal sensor terjatuh

Plat hologram utk sinyal sensor terjatuh
Sensor tidak mendapat sinyal,
 menyebabkan motor tidak dapat bergerak

Technical Overview: The Hologram Reflector & Optical Sensor System

To track and manage physical balls inside the lift mechanism, Monster Drop uses an optical reflective sensor system paired with a special hologram reflector sticker/plate.

                           +------------------------+
                           |  MAIN CONTROL BOARD    |
                           +-----------+------------+
                                       |
                               (Optical Signal)
                                       |
                                       v
[Optical Sensor / Transmitter] ---> [Hologram Reflector] ---> [Sensor Receiver]
                                           |
                                   (Ball Blocks Beam)
                                           |
                              [Signals Motor to Lift Ball]

• The Hologram Reflector: Acts as a specialized mirror that reflects the sensor light back to the optical receiver pin with high accuracy under cabinet lighting.

• The Sensor Mechanism: When a ball enters the lift channel, it breaks or changes the reflected light path off the hologram background. This alerts the game controller to run the elevator motor and deliver the ball up to the dropping chute.

Sensor home bola,
sensor infrared menggunakan reflektor hologram
(seperti pada sensor ring street basketball)

Saat standby (bola kosong) terukur 5 Volt pada pin OUT
motor travel bola berputar membawa bola keatas

Root Cause Analysis: Fallen Hologram Reflector

When the ball lift mechanism stops working and balls remain trapped at the bottom, the most common root cause is a fallen or detached hologram reflector plate/sticker (reflektor hologram jatuh).

Why the Ball Fails to Elevate:

1. Loss of Light Reflection: Over time, ball impact vibrations, dust, or adhesive degradation cause the reflective hologram backing to loosen and fall off its mounting position.

2. False Sensor Reading: Without the hologram reflector in place, the optical receiver registers a continuous "no reflection" or "blocked beam" state.

3. Elevator Timeout Protection: The main control board senses a continuous fault state on the optical circuit and disables the ball lift motor to prevent mechanical jamming or gear strip damage.

4. Result: The game display registers an empty ball state, and no balls are lifted to the player chamber.

Step-by-Step Diagnostic & Repair Procedure

Follow this technical workflow to diagnose and permanently fix the "Ball Fails to Rise" fault in Monster Drop:

[Fault: Ball Fails to Rise / Ball Chamber Empty]
                       |
                       v
       [Inspect Ball Lift Sensor Area]
                       |
       +---------------+---------------+
       |                               |
[Hologram Reflector Missing/Fallen]  [Hologram Reflector In Place]
       |                               |
       v                               v
 Re-attach / Replace Hologram     Inspect Optical Sensor Lenses
 Reflector Plate                  (Check for dust, loose wires,
       |                          or burnt IR emitter)
       v                               |
 Verify Hand Test Signal               v
 (Block & Unblock Beam)           Test DC Voltage & Harness

1. Visual & Physical Inspection

• Open the lower access door or lift channel assembly of the Monster Drop cabinet.

• Locate the optical sensor path at the base of the ball elevator channel.

• Inspect the Reflector: Check if the hologram reflector sheet/plate is still securely affixed directly opposite the sensor eyes.

• Look for the fallen piece: If the hologram sheet has unglued, it will typically be lying at the bottom of the cabinet or caught in the ball track.

2. Hologram Reflector Replacement & Repair

• Cleaning: If the original hologram reflector is recovered, clean the mounting surface thoroughly with isopropyl alcohol to remove old adhesive, grease, and dust.

• Re-application: Apply high-tack industrial double-sided tape or silicone adhesive to the back of the hologram reflector plate.

• Alignment: Re-mount the hologram reflector so it aligns 100% directly opposite the optical sensor transmitter/receiver head.

• Replacement: If the hologram surface is scratched or missing, replace it with an OEM Benchmark Games hologram reflector sheet (or high-reflectivity prism tape).

3. Sensor Testing & Calibration

• Power on the Monster Drop machine into test mode.

• Hand / Ball Test: Pass a ball or your hand between the sensor head and the newly mounted hologram reflector.

• Observe Indicator LED:

  • Unblocked State: Sensor status LED remains solid (indicating clear optical signal reflection off the hologram).

  • Blocked State (Ball Present): Sensor status LED toggles state (indicating beam break / target detection).

• Verify Motor Activation: Ensure the elevator motor engages smoothly once the sensor registers ball presence.

Preventative Maintenance Checklist for Monster Drop

Inspection Point	Frequency	Action Required
Hologram Reflector Surface	Weekly	Wipe off dust/fingerprints with a dry microfiber cloth. Check adhesive edges.
Optical Sensor Lenses	Monthly	Gently clean sensor lenses using cotton swabs dipped in isopropyl alcohol.
Elevator Belt & Gears	Monthly	Check drive belt tension and gear teeth for wear caused by jammed balls.
Cable Harness Strain	Quarterly	Inspect wiring connectors near the lift motor for pin backing or cable wear.

Summary of Arcade Sensor Types Across All Modules

With Monster Drop added, here is the complete reference spectrum for arcade sensors:

+-----------------------------------------------------------------------------------+
|                        MASTER ARCADE SENSOR REFERENCE SUMMARY                      |
+----------------------+--------------------+---------------------------------------+
| Game Machine         | Sensor Type        | Critical Diagnostic Focus             |
+----------------------+--------------------+---------------------------------------+
| Street Basketball    | IR Beam Module     | Clean 1x Reflector; Check NO/NC LEDs  |
| Dream Shooter        | Dual IR Module     | Green (Standby) -> Yellow (Score)     |
| Firefighter / Dino   | Inductive Prox.    | Metal target detection; 0V-5V OUT     |
| Basketball Gate      | Limit / Prox.      | Continuous movement = Broken harness  |
| Monster Drop         | Hologram Optical   | Inspect for fallen hologram reflector |
+----------------------+--------------------+---------------------------------------+

Inspection Point

Frequency

Action Required

Hologram Reflector Surface

Weekly

Wipe off dust/fingerprints with a dry microfiber cloth. Check adhesive edges.

Optical Sensor Lenses

Monthly

Gently clean sensor lenses using cotton swabs dipped in isopropyl alcohol.

Elevator Belt & Gears

Monthly

Check drive belt tension and gear teeth for wear caused by jammed balls.

Cable Harness Strain

Quarterly

Inspect wiring connectors near the lift motor for pin backing or cable wear.

Saat aktif (bola terisi) terukur 0 Volt pada pin OUT
motor travel bola berhenti berputar

Continue

Cats & mice error 10

Cats & mice error 10

Continue

Funny duck - E 01

Funny duck - E 01

Continue

All about timing - Er - 4

All about timing - Er - 4

Continue

Street Basketball Arcade Repair: Stage 2 Hoop / Rim Not Moving (Loose Motor Bolts)

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.

stage 2 ring tidak gerak

Continue

toy storage - tidak menjapit

toy storage - tidak menjapit 

Continue

Crazy clok - eror 1 eror 2

Crazy clok eror 1 eror 2

Continue