The Canon G7020 is a high-capacity MegaTank inkjet printer designed for home and small office use, featuring refillable ink tanks, wireless connectivity, automatic duplex printing, and support for various media types. This service manual provides detailed information for qualified technicians regarding safety procedures, disassembly/assembly, maintenance, troubleshooting, and parts replacement. Below are key sections covering technical specifications, service precautions, maintenance procedures, and error code resolution.
Before servicing, read all safety instructions to prevent injury and equipment damage.
| Hazard Type | Precaution |
|---|---|
| Electrical Shock | Unplug the printer before disassembly. Discharge any static electricity. |
| Heat Hazard | Allow printer to cool completely after use before servicing internal components. |
| Ink Spills | Wear protective gloves. Handle ink tanks and print head carefully to avoid leaks. |
| Moving Parts | Keep hands clear of carriage assembly and paper feed rollers during operation. |
| Laser/UV Safety | This model does not contain laser scanning units. No special optical precautions required. |
WARNING! Service should only be performed by qualified Canon-certified technicians. Use genuine Canon parts.
Step-by-step guide for accessing internal components.
CAUTION! Label all cables and screws. Follow reverse order for reassembly. Ensure all connectors are firmly seated.
Routine maintenance procedures to ensure optimal performance.
Tip: Run a nozzle check pattern after cleaning to verify print quality.
| Error Code/ Symptom | Possible Cause | Corrective Action |
|---|---|---|
| E02, E03, E04 | Paper jam in different sections | Open covers, remove jammed paper carefully. Check for torn pieces. |
| E05 | Carriage movement error | Check for obstructions. Ensure carriage moves freely. Inspect encoder strip. |
| E13, E14, E15 | Ink system error (pump, tank detection) | Check ink tank installation. Inspect ink tubes for leaks/air bubbles. Run ink system purge. |
| E16 | Waste ink pad full | Enter service mode to reset counter (temporary). Replace waste ink absorber. |
| No Power | Power cord, main board, or power supply unit | Verify AC outlet. Check fuse on main board. Test DC outputs from power supply. |
| Poor Print Quality | Clogged nozzles, low ink, misaligned head | Perform head cleaning and alignment. Check ink levels. Replace print head if necessary. |
| Wireless Connection Fail | Router settings, distance, interference | Reset network settings on printer. Ensure correct SSID/password. Check for firmware updates. |
Key replaceable components and their part numbers (example references).
Note: Always verify part numbers with the latest Canon parts catalog. Exploded diagrams are included in the full PDF manual.
Instructions for updating printer firmware.
WARNING! An interrupted firmware update can render the printer inoperable.
Reference voltages at key test points on the main board (with printer powered on).
| Test Point | Signal Name | Normal Voltage (DC) |
|---|---|---|
| TP101 | +5V_LOGIC | +5.0V ±5% |
| TP102 | +3.3V | +3.3V ±5% |
| TP201 | +24V_MOTOR | +24V ±10% |
| TP202 | V_REF (Print Head) | +15.5V ±5% |
CAUTION! Measurements should be taken by a technician using proper grounding to avoid electrostatic discharge (ESD) damage.
Service mode functions for calibration.
Tip: Document any user settings before performing EEPROM initialization.
This product complies with relevant safety and EMC standards.
For technical support and service inquiries, contact Canon Authorized Service Centers or visit www.usa.canon.com/support.