ICT L70 Bill Acceptor: Diagnosing Intermittent... | terminalfaults.org

Technical Background:

The ICT L70 communicates via a serial or USB interface (depending on the model). Communication errors can be caused by voltage drops below the required 24V DC, signal attenuation due to cable degradation, electrostatic discharge (ESD) events affecting the communication IC, or baud rate mismatches between the acceptor and the host. Polymer bill residue and mechanical path obstructions contribute to internal solenoid load and voltage fluctuations.

Symptoms:

Intermittent communication loss between the ICT L70 bill acceptor and the host system. Symptoms may include the bill acceptor intermittently failing to respond to commands, reporting errors, or being undetectable by the host system.

Possible Causes:

Damaged or improperly shielded interface cable resulting in signal attenuation and interference.
Loose or corroded connector pins on the interface cable or the acceptor's communication port.
Voltage drops in the 24V DC power supply line affecting the acceptor's communication IC.
Electrostatic discharge (ESD) events damaging the communication IC within the acceptor.
Environmental factors, such as extreme temperature (-40C) causing cable embrittlement or connector oxidation.
Cable strain or damage due to vandalism or repeated movement of the kiosk.

Solution:

1

Power cycle the ICT L70 bill acceptor by disconnecting and reconnecting the 24V DC power supply. Monitor for recurrence of the error.
2

Inspect the interface cable for visible damage, such as cuts, kinks, or frayed shielding. Replace the cable if damage is present.
3

Verify that the interface cable is securely connected to both the bill acceptor and the host system. Reseat the connectors and ensure they are properly latched.
4

Use a multimeter to measure the voltage at the bill acceptor's power input terminals. Verify that the voltage is within the specified range (typically 24V DC +/- 10%).
5

Clean the connector pins on the interface cable and the acceptor's communication port with a contact cleaner specifically designed for electronic components. Ensure all components are completely dry before reconnecting.
6

Check the host system's communication settings (baud rate, parity, data bits, stop bits) and ensure they match the ICT L70's specifications. Consult the ICT L70's technical manual for correct settings.
7

If the error persists, try a different interface cable known to be functional. This helps isolate whether the cable itself is the source of the problem.

Safety Warning:

This device operates on 24V DC. Ensure the power supply is disconnected before performing any maintenance or troubleshooting. Avoid contact with exposed wiring. Commercial Kiosk environment: High vandalism risk. Report any signs of tampering. Ensure adequate ventilation to prevent overheating.

Prevention:

Regularly inspect the interface cable for damage and replace it as needed.,Ensure that the interface cable is properly shielded and routed away from potential sources of electromagnetic interference.,Secure the interface cable to prevent strain or damage from movement or vandalism. Use cable ties or other strain relief devices.,Periodically clean the connector pins on the interface cable and the acceptor's communication port.,Apply a thin coat of dielectric grease to the connector pins to prevent corrosion.,Monitor the 24V DC power supply voltage to ensure it remains within the specified range. Replace the power supply if it is consistently producing low voltage.

Expert Tip:

Intermittent communication errors can sometimes be caused by marginal power supplies. Even if the voltage appears to be within the specified range, the power supply may be unable to provide sufficient current under load. Temporarily replace the existing power supply with a known-good power supply of equal or greater current capacity to rule out this possibility.

Frequently Asked Questions

•What is the recommended interface cable type for the ICT L70 in a high-vandalism environment?

A shielded, heavy-duty cable with locking connectors is recommended to prevent damage and tampering.

•How often should the interface cable and connectors be cleaned in a commercial kiosk setting?

At least once every three months, or more frequently in dusty or humid environments. Follow the cleaning procedures outlined in the ICT L70's technical manual.

•What are the typical baud rate settings for the ICT L70 when communicating with a host system?

The default baud rate is typically 9600, but this may vary depending on the host system and configuration. Consult the ICT L70's technical manual for the specific baud rate settings required.

ICT L70 Bill Acceptor: Diagnosing Intermittent Communication Errors via Interface Cable

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the recommended interface cable type for the ICT L70 in a high-vandalism environment?

•How often should the interface cable and connectors be cleaned in a commercial kiosk setting?

•What are the typical baud rate settings for the ICT L70 when communicating with a host system?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: