Canon BJC-820 Service Manual page 61

Part 4: TROUBLESHOOTING
10. Head
Temperature
Error
<Measure>
Visually check ink tank
Is there ink ?
Yes
Leave printer for several
minutes with power off
Turn power on
Is error indicated?
Yes
1. Replace BJ cartridge
2. Replace logic board
<Cause>
The print head is too hot.
<Suspected parts>
Check if printing is being conducted with
an empty ink tank.
No
Replace ink tank
BJ cartridge head unit may have overheated.
No
END
4-10
BJ cartridge, logic board, empty ink tank.
BJC-8200