G-13 Product Dispensing Failure: Technical Diagnosis and... | terminalfaults.org

Technical Background:

The G-13 dispensing mechanism relies on 24V DC solenoids or a DC motor to release products. The logic controller monitors coin validation signals and, upon sufficient credit, triggers the corresponding dispensing circuit. Failures can stem from voltage drops, solenoid coil burnout, or mechanical obstructions in the dispensing path. Cold temperatures (-40C) can increase the viscosity of lubricants, increasing mechanical resistance. Bill validator is outside the scope of the presented fault.

Symptoms:

Unit accepts coin validation but fails to initiate the product dispensing mechanism. No mechanical response observed from the dispensing solenoids or motor. Power is confirmed to the unit.

Possible Causes:

1. Solenoid coil failure: Open circuit or short circuit within the dispensing solenoid.
2. Mechanical obstruction: Product jammed in the dispensing mechanism, preventing movement.
3. Low voltage: Insufficient 24V DC supply reaching the solenoids or motor due to wiring issues or power supply degradation.
4. Logic controller failure: Faulty signal from the logic controller preventing solenoid activation.
5. Wiring harness fault: Damaged or disconnected wiring between the logic controller and the dispensing mechanism (corrosion or vandal damage).
6. Motor failure (if applicable): Worn brushes, commutator damage, or winding failure in the DC dispensing motor.

Solution:

1

Perform a visual inspection of the dispensing area for any obvious obstructions or damage.
2

Use a multimeter to verify the 24V DC power supply is providing the correct voltage at the input to the dispensing mechanism. Note any voltage sag when the dispensing mechanism is supposed to activate.
3

Check the wiring harness and connectors between the logic controller and the dispensing mechanism for loose connections, corrosion, or damage. Reseat connectors securely.
4

Manually actuate each dispensing mechanism, if possible, to determine if the issue is isolated to a specific product selection.
5

Using a multimeter in resistance mode, test the solenoid coil(s) for continuity. An open circuit indicates a failed solenoid.
6

If applicable, check the DC dispensing motor's brushes for wear. If worn, replace the brushes.
7

Consult the G-13 service manual for diagnostic codes and troubleshooting procedures specific to the dispensing mechanism.

Safety Warning:

High-voltage electrical components are present within the G-13. Always disconnect the power supply before performing any maintenance or troubleshooting. Ensure the unit is stable and cannot tip over during maintenance. Be cautious of sharp edges and pinch points within the dispensing mechanism. Extreme cold weather can increase the risk of frostbite when handling metal components.

Prevention:

Regularly inspect the dispensing area for obstructions and clear any jams promptly. Periodically clean and lubricate the dispensing mechanism according to the manufacturer's recommendations, using a lubricant suitable for low-temperature operation. Inspect wiring harnesses for wear and corrosion annually. Schedule preventative maintenance every six months.

Expert Tip:

If the dispensing mechanism only fails intermittently, suspect a thermal issue affecting a component on the logic board or within a solenoid. Use a thermal camera or freeze spray to isolate the failing component. Check for cold solder joints on the logic board, especially around power supply components and connectors.

Frequently Asked Questions

•What type of lubricant is recommended for the dispensing mechanism in cold weather conditions?

Use a low-temperature, synthetic grease designed for electromechanical components. Refer to the G-13 service manual for specific recommendations.

•How can I prevent vandalism to the wiring harness?

Use conduit or flexible tubing to protect exposed wiring. Secure the wiring harness to the chassis with cable ties or clamps to prevent tampering.

•What is the typical lifespan of the dispensing solenoids?

The lifespan of the dispensing solenoids depends on the frequency of use and environmental conditions. Expect a lifespan of 500,000 to 1,000,000 cycles under normal operating conditions. Replace solenoids as part of a preventative maintenance schedule.

G-13 Product Dispensing Failure: Technical Diagnosis and Solution

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What type of lubricant is recommended for the dispensing mechanism in cold weather conditions?

•How can I prevent vandalism to the wiring harness?

•What is the typical lifespan of the dispensing solenoids?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: