Samsung SF-4500 Service Manual page 48

Color Head
70°C
• HEAD DETECTION CIRCUIT
Babbage ink cartridge has 8-bit mask ROM I.D. to
check the type of cartridge. In order to detect the
head, HSM signal is used as ENABLE signal and
BA3 signal as START & STOP BIT, and BA1 and
BA2 as clock signal of each bit, and ID signal in the
HSM
(Pwr)
BA3
(Load)
BA1
(Clock1)
BA2
(Clock2)
HEAD-DATA
Head I.D read : HEAD-DATA
Mono : 07H
Color : 08H
Samsung Electronics
Fig.6-1-14. Temperature around Color Head
Min 500ns
bit7 bit6 bit5
Fig.6-1-15. HEAD DETECTION TIMING DIAGRAM
cartridge is put in HEAD-DATA port of KS32C6200
through BSF line. With each bit
controlled, 8bit I.D data is read and STOP bit is put
out of BA3(LOAD) port. Then it finishes.
If data is mono, it is 07H. If color, 08H.
Clock Delay
bit4 bit3 bit2 bit1 bit0
6-17