Detectable Problems From System Start To Exit - Canon S520 Service Manual

Part 2: Troubleshooting

2.2 Detectable Problems from System Start to Exit

Errors unresolvable by the user can be checked before system startup is completed.
AC power connection
controller initialization
home position obtained
CPU & printer
DRAM check
No
OK?
Yes
EEPROM check
Power ON
Power LED lights
Error check
Key input detection
prohibited
Sensor power ON
Interrupt error
detection starts
Head presence
detection
Paper feed encoder
Take the cartridge to the home
position.
To next
page
RAM error
Checksum
S520/S750 only
EEPROM error
ROM error
RAM error
S820/S900 only
VSEN ON
Cartridge error (a)
Abnormal internal
temperature error
Abnormal head
temperature error
2-6
S900 / S820 / S750 / S520
Orange lamp
lights
Orange/green
toggle blinking 9
times
Orange/green
toggle blinking 11
times
Orange/green
toggle blinking 10
times
Orange blinks 7
times
Orange/green
toggle blinking 6
times
Orange/green
toggle blinking 8
times