Service manual

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