Samsung SF-4500 Service Manual page 38

6-1-2-7. INKJET HEAD CONTROLLER
This part produces major control signals used to
drive INKJET head. It consists of signals to drive
head nozzles, /HGA[13:1], HOE[16:1], /FAULT-
TEST, /HEAD-EN, and BIASOFF, and consists of sig-
nals to check the status of the head, HEAD-DATA.
/HGA
Signal
Pre-Heat Pulse Width
HOE
Signal
Front End Delay
Samsung Electronics
It has double height print head, system 208 nozzles
for mono and 192 nozzles for color, and uses
/HGA[13:1], HOE[16:1] signals and /HEAD-EN to
drive these nozzles. Fig.5-1-8 is timing diagram of
each signal.
Fire Enable Timer
t (PD)
p
Fire Pulse Width
Pr-Heat Delay Width
Fig.6-1-8 Timing Diagram to Drive Head
Back End Delay
6-7