G-13 Coin Acceptance Sensitivity Adjustment Procedure -... | terminalfaults.org

Technical Background:

Coin acceptance relies on inductive sensors detecting metallic composition, diameter, and thickness. The G-13 likely uses a 24V DC power supply for its solenoid-driven coin routing mechanism and sensor array. Changes in ambient temperature affect the sensor readings and solenoid response times. Signal attenuation in the sensor cables can also contribute to reduced sensitivity. ESD events can disrupt the microcontroller's analog-to-digital conversion process for coin discrimination.

Symptoms:

The G-13 coin acceptor exhibits inconsistent acceptance rates. Certain coin denominations are frequently rejected, while others are consistently accepted. The issue appears intermittent, fluctuating with environmental conditions.

Possible Causes:

1. Sensor calibration drift due to environmental factors (temperature fluctuations).
2. Accumulation of dust or debris on the coin sensor heads, interfering with accurate readings.
3. Corrosion or oxidation on the coin sensor electrical contacts, causing signal attenuation.
4. Fluctuations in the 24V DC power supply voltage, affecting sensor performance.
5. Solenoid malfunction due to wear or contamination.
6. Damaged or loose sensor wiring harness.

Solution:

1

Verify the 24V DC power supply output voltage is within the manufacturer's specified range (typically +/- 5%).
2

Visually inspect the coin acceptor sensor heads for any visible dust, debris, or corrosion. Clean gently with a dry, lint-free cloth.
3

Check the coin acceptor wiring harness for any loose connections, frayed wires, or damage.
4

Perform a coin acceptor diagnostic test, if available, through the kiosk's maintenance menu.
5

If the kiosk has a software-adjustable coin sensitivity setting, incrementally adjust the sensitivity according to the manufacturer's instructions.
6

Review the event logs for any error codes related to the coin acceptor.
7

If sensitivity problems persist, consider replacing the coin acceptor unit.

Safety Warning:

The G-13 kiosk operates on 24V DC. Before performing any maintenance, ensure the kiosk power is disconnected via appropriate Lockout/Tagout (LOTO) procedures to prevent electrical shock. Exercise caution when handling electrical components. Wear appropriate personal protective equipment (PPE), such as insulated gloves.

Prevention:

Implement a regular cleaning schedule for the coin acceptor, especially in high-traffic or dusty environments. Ensure the kiosk enclosure provides adequate protection from extreme temperature fluctuations. Periodically inspect the wiring harness for signs of wear or damage. Apply dielectric grease to electrical connections to prevent corrosion.

Expert Tip:

Check for common ground loops with other kiosk components or nearby equipment. Insufficient grounding of the kiosk can cause spurious signals, and coin validator errors. Inspect the grounding strap to the metal frame.

Frequently Asked Questions

•What is the specific range of the 24V DC power supply for the G-13?

Consult the G-13's technical documentation for the specific voltage range, typically 23-25V.

•Where can I find the coin acceptor diagnostic test in the kiosk's maintenance menu?

The location and name of the diagnostic test will vary depending on the kiosk's software. Consult the kiosk's operating manual.

•What type of dielectric grease should be used on the coin sensor electrical contacts?

Use a non-silicone based dielectric grease specifically designed for electrical connections.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the specific range of the 24V DC power supply for the G-13?

•Where can I find the coin acceptor diagnostic test in the kiosk's maintenance menu?

•What type of dielectric grease should be used on the coin sensor electrical contacts?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: