Gryphon Coin Mech: Loud Motor and Coin Rejection... | terminalfaults.org

Technical Background:

Coin mechanisms typically use a 24V DC motor to drive coin acceptance and dispensing. Optical or inductive sensors detect coin presence and validate diameter/material. Sensor data is processed by a microcontroller to determine coin acceptance. A solenoid-actuated gate either accepts or rejects the coin based on the microcontroller's decision. Cold temperatures (-40C) can increase motor viscosity, leading to higher current draw and reduced torque.

Symptoms:

The Gryphon coin mechanism exhibits a loud motor noise during operation, accompanied by the rejection of inserted coins.

Possible Causes:

Foreign object lodged in the coin path obstructing sensor view.
Optical sensor malfunction or contamination causing incorrect coin validation.
Motor bearing failure resulting in increased friction and noise.
Solenoid failure preventing proper coin acceptance gate operation.
Corrosion on sensor contacts due to environmental exposure.
Low voltage condition affecting motor torque and sensor accuracy.

Solution:

1

Visually inspect the coin entry and exit points for any obstructions. Use a flashlight to illuminate the internal coin path.
2

Use compressed air to gently blow out any dust or debris from the coin mechanism, particularly around the sensors.
3

Inspect the wiring harness connecting the coin mechanism to the kiosk's power supply and control system. Check for loose connections or damaged wires.
4

Measure the 24V DC power supply voltage at the coin mechanism connector. Ensure voltage is within +/- 5% of nominal.
5

Cycle power to the kiosk and observe the coin mechanism's operation. Listen for any unusual noises or hesitations.
6

If possible, use a coin validator diagnostic tool (if available) to test sensor functionality and identify error codes.
7

Document all observations and actions taken.

Safety Warning:

This coin mechanism operates on 24V DC. Before performing any maintenance, ensure the kiosk power is disconnected and locked out using Lockout/Tagout (LOTO) procedures. Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.

Prevention:

Regularly inspect and clean the coin mechanism, coin path and sensors. Schedule preventative maintenance every 3-6 months, including inspection for loose wiring and corrosion. Consider installing a desiccant pack inside the kiosk enclosure to reduce humidity.

Expert Tip:

A common issue is that the coin validator sensors are extremely sensitive to ambient light. If the unit is in direct sunlight, temporarily shield the coin validator with a dark cloth to eliminate stray light affecting coin validation. Check the coin mech's ground connection; a poor ground can cause erratic behaviour.

Frequently Asked Questions

•What diagnostic tool is recommended for testing the coin validator sensors?

The specific diagnostic tool depends on the Gryphon Coin Mech model. Consult the manufacturer's documentation for compatible tools. Multimeters and logic probes can also be used for basic sensor testing.

•What is the typical lifespan of the 24V DC motor in the coin mechanism?

The lifespan depends on usage frequency and environmental conditions. Under normal usage, the motor should last 3-5 years. Extreme temperatures or high usage can shorten its lifespan.

•What type of lubricant is recommended for the coin mechanism moving parts?

Use a dry PTFE lubricant sparingly on moving parts to reduce friction without attracting dust or debris. Avoid oil-based lubricants, as they can attract contaminants.

Gryphon Coin Mech: Loud Motor and Coin Rejection Diagnostic

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What diagnostic tool is recommended for testing the coin validator sensors?

•What is the typical lifespan of the 24V DC motor in the coin mechanism?

•What type of lubricant is recommended for the coin mechanism moving parts?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: