Brother MFC4820C Service Manual page 68

Purge timing
First automatic cleaning after
purchase
Cleaning initiated using the
function panel
Cleaning after test printing
After ink cartridge replacement
Periodical automatic cleaning
[ 3 ] Volume of ink in the ink cartridges
Type
Black ink cartridge
Color ink cartridge
[ 4 ] Positive pressure control purge system
To prevent air from flowing back into the head nozzles after a purge operation, the air pump
powered by the purge motor operates simultaneous to the purge being performed. This also serves
to improve ink jet-out reliability.
Drained ink reservoir
Purge type
Initial purge Normal purge
Capacity
16 cc
15 cc
Air
Purge
pump
pump
√
√
√
√
√
Usable ink volume
13.5 cc
12.5 cc
4 -2 7
Cyan
Reset purge substitute
purge
√ √
√
√
Compressed air
Color ink
Compressed air
Black ink
Reset purge
+ suction
√