Self-service Touch Screen Machine

After-Service Maintenance Guide: Thermal Printer Replacement & Wireless Signal Debugging FAQ
1. Thermal Printer Maintenance
1.1 Basic Specifications

Model: RP-320 (Industrial-grade)

Speed: 200mm/s

Resolution: 203dpi

Paper roll: φ83mm×φ40mm

1.2 Troubleshooting

1.3 Consumable Replacement

1.Power off and open cover

2.Remove old roll, clean debris

3.Load new roll (arrow direction, thermal side out)

4.Thread 5cm paper through sensor slot

5.Press FEED button to test

2. Wireless Network Debugging

2.1 Signal Standards

Excellent: -50dBm to -60dBm

Acceptable: -60dBm to -70dBm

Poor: ＜-70dBm

2.2 Common Issues
Issue 1: Frequent disconnects

Checks:

1.Router channel congestion (use WiFi analyzer)

2.＞30m distance to AP

3.Metal obstructions

Solutions:

1.Fix 2.4G channel to 1/6/11

2.Add repeater

Issue 2: ＞5s call delay

Checks:

Network latency (ping＞100ms)

Terminal memory usage＞80%

Solutions:

Switch to 5GHz

Reboot terminal

2.3 Debug Toolkit

Essentials:

Portable AP (backup)

Network tester

Signal booster

Apps:

WiFi Analyzer (channel scan)

Fing (topology detection)

3. Preventive Maintenance

3.1 Daily Checks

Printer: Clean paper path

Network: Ping test 3x (packet loss＜1%)

3.2 Monthly

Replace dust filters

Tighten antenna connectors

Update SSID passwords

3.3 Annual

Replace print head (every 500k prints)

Update AP firmware

Battery capacity test

4. Emergency Protocols

4.1 Printer Failure

1.Activate backup printer

2.Switch to "manual tickets + voice calling"

3.Post outage notice with ETA

4.2 Network Outage

1.Enable 4G hotspot

2.Offline mode (local 500-record storage)

3.Auto-sync data post-recovery

5. Support Tiers

Level 1: 400 hotline guidance (24/7)

Level 2: Remote desktop (30-min response)

Level 3: On-site engineer (4hr arrival in capital cities)