G-13 Coin Sensor Calibration Procedure - Solar Faults | terminalfaults.org

Technical Background:

Coin validation relies on inductive sensors measuring coin diameter, thickness, and metallic composition. Sensor output is converted to a digital signal by an internal analog-to-digital converter (ADC). Signal drift can occur due to temperature fluctuations, power supply variations (+24VDC), or component aging. Baud rate for data transmission between the coin validator and the host system is typically 9600. ESD events can damage sensor circuitry or corrupt calibration data.

Symptoms:

The G-13 coin validator is registering incorrect coin values or rejecting valid coins. Coin acceptance rates are below the specified threshold (default 95%). Frequency of 'invalid coin' errors has increased. Coin path appears unobstructed but coin value errors persist.

Possible Causes:

Sensor drift due to environmental temperature fluctuations exceeding operating specifications (-40C to +60C).
Accumulation of dust or debris on coin sensor heads, attenuating the inductive signal.
Voltage instability in the 24VDC power supply, leading to inaccurate ADC readings.
Loose or corroded connector(s) on the coin sensor harness (attenuated signal).
Software corruption within the coin validator's internal memory, affecting calibration parameters.
Electromagnetic Interference (EMI) from nearby equipment affecting sensor readings.

Solution:

1

Verify input voltage: Confirm the G-13 is receiving a stable 24VDC power supply using a multimeter. Measure voltage at the validator input terminals.
2

Clean sensor heads: Use compressed air and a soft brush to carefully remove dust and debris from the coin sensor heads. Avoid using liquids.
3

Run diagnostics: Initiate the G-13's built-in diagnostic mode (refer to the G-13 service manual for the specific key combination or procedure). Note any error codes.
4

Download calibration data: Obtain the latest calibration data file for the G-13 from the manufacturer's website or authorized distributor.
5

Upload calibration data: Use a compatible programming tool (typically a serial communication interface via USB) to upload the calibration data to the G-13. Follow the manufacturer's instructions precisely.
6

Test with coin set: Cycle the validator with a full set of test coins, verifying correct identification and value registration for each denomination.
7

Monitor performance: Track coin acceptance rates and error frequencies over a 24-hour period to ensure calibration stability.

Safety Warning:

The G-13 operates on 24VDC. Disconnect power before performing any cleaning or maintenance. Use caution when working around electrical components. Ensure the kiosk is securely mounted to prevent tipping or accidental damage. Avoid operating the G-13 in excessively humid environments, which can promote corrosion and electrical shorts.

Prevention:

Regularly clean the coin validator's sensor heads (every 3 months). Implement a scheduled preventative maintenance program to check power supply voltage and connector integrity (every 6 months). Ensure proper grounding of the cash kiosk to minimize ESD risks. Apply strain relief to all cable connections to prevent loosening.

Expert Tip:

If calibration fails repeatedly, check for physical damage to the sensor heads (scratches, cracks). Slight damage can be enough to cause sensor drift even after calibration. Use a known good power supply to rule out voltage fluctuations as a source of the calibration issues.

Frequently Asked Questions

•Where can I find the G-13 service manual?

Contact the manufacturer directly or an authorized distributor.

•What type of programming tool is required to upload calibration data?

Consult the G-13 service manual for the specific communication interface and software requirements. Typically a serial to USB adapter and a proprietary software from the validator manufacturer are needed.

•How often should I replace the test coin set?

Replace the test coin set if the coins exhibit significant wear or corrosion. Damaged or altered coins can lead to inaccurate calibration.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where can I find the G-13 service manual?

•What type of programming tool is required to upload calibration data?

•How often should I replace the test coin set?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: