MEI Gryphon Coin Mechanism Battery Backup Failure... | terminalfaults.org

Technical Background:

The MEI Gryphon coin mechanism uses a 24V DC power supply. During normal operation, this supply powers the coin dispensing solenoids and logic. A battery backup system, typically a rechargeable NiMH or Lithium-Ion battery pack, provides temporary power to these solenoids and logic upon loss of the primary 24V DC input. The charging circuit monitors the primary power and charges the battery when available. The dispensing solenoids require sufficient voltage (typically >18V DC) and current to actuate. Low battery voltage, a failed charging circuit, or a faulty battery connection can prevent dispensing during a power outage.

Symptoms:

Coin mechanism fails to dispense change during a power outage. Specifically, the battery backup system is not maintaining power to the dispensing mechanism.

Possible Causes:

Defective battery: The battery may be unable to hold a sufficient charge to operate the dispensing solenoids.
Failed charging circuit: The charging circuit may not be properly charging the battery.
Corroded battery terminals: Corrosion on the battery terminals can increase resistance and reduce current flow.
Loose battery connector: The connector between the battery and the coin mechanism's circuit board may be loose or disconnected.
Solenoid failure: One or more of the dispensing solenoids may be faulty or jammed, requiring more power than the battery can provide.
Internal component failure: Failure within the coin mechanism's control board affecting battery monitoring or switching circuitry.

Solution:

1

Inspect the battery terminals for corrosion. Clean any corrosion with a wire brush and apply a corrosion inhibitor.
2

Measure the battery voltage with a multimeter. A fully charged battery should read above its nominal voltage (e.g., 3.6V for a 3.7V Li-Ion battery).
3

Disconnect and reconnect the battery connector to ensure a secure connection.
4

If possible, test the battery's capacity with a battery analyzer. Replace the battery if its capacity is significantly reduced.
5

Check the voltage at the solenoid connectors when power is removed. If the voltage is significantly lower than the battery voltage, there may be a wiring issue or a fault on the circuit board.
6

Observe the coin mechanism during a simulated power outage (disconnect the main power). If the solenoids attempt to actuate but fail, the battery may be weak or there may be a mechanical obstruction.
7

Consult the MEI Gryphon service manual for specific troubleshooting steps and component testing procedures.

Safety Warning:

This device operates on 24V DC power. Ensure the power supply is disconnected before performing any maintenance or troubleshooting. Avoid contact with exposed wires or components. Refer to the MEI Gryphon service manual for detailed safety instructions.

Prevention:

Regularly inspect the battery terminals for corrosion.,Replace the battery every 2-3 years, or as recommended by the manufacturer.,Ensure the coin mechanism is protected from extreme temperatures, which can shorten battery life.,Periodically test the battery backup system by simulating a power outage.,Keep the coin mechanism clean and free of debris to prevent mechanical obstructions.

Expert Tip:

A common failure point is the battery connector itself. Even if it appears connected, the crimp connections within the connector can degrade over time. Try gently wiggling the connector while monitoring the voltage at the solenoid to see if the voltage fluctuates.

Frequently Asked Questions

•What is the battery type used in the MEI Gryphon coin mechanism?

The MEI Gryphon typically uses a rechargeable NiMH or Lithium-Ion battery pack. Refer to the device's documentation for the specific battery type and voltage.

•Where can I find the MEI Gryphon service manual?

The MEI Gryphon service manual can usually be obtained from the manufacturer's website or by contacting their technical support department.

•What is the expected lifespan of the battery in the MEI Gryphon?

The expected lifespan of the battery is typically 2-3 years, depending on usage and environmental conditions.

MEI Gryphon Coin Mechanism Battery Backup Failure Analysis

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the battery type used in the MEI Gryphon coin mechanism?

•Where can I find the MEI Gryphon service manual?

•What is the expected lifespan of the battery in the MEI Gryphon?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: