Service manual

5-20 Samsung Electronics
¥ SURROUNDING TEMPERATURE SENSOR
DS1621S(DALLAS SEMI.) is applied to read the temperature around ink cartridge. It is used to get optimum
inking quality by keeping the viscosity of ink in the cartridge in the specified lerel. The way to read tem-
perature is similar to EEPROM, controlled by THM-CLK, THM-DATA LINE. Digital thermometer to check
the surrounding temperature is assembled along with home sensor in the frame of assembly CR. After each
line is printed, it reads the surrounding temperature and heats substrate heater in the ink cartridge during
the accelerating time of CR to keep the viscosity of ink in the specified lerel.
5-1-5-4. HEAD DRIVING TIMING
Control signal from MFP controller (KS32C6200:U15) enters the head driver and it becomes the level to be able
to drive the head nozzles (+11.75V). It is depicted in the following diagram.
BA
Signal
t
p(PD)
BP
Signal
Pre-Heat Pulse Width Fire Pulse Width
Fire Enable Timer
Pre-Heat Delay Width
Front End Delay
Back End Delay
Fig.5-1-16. HEAD DRIVING TIMING DIAGRAM