Specifications

REV.-A
(1) Charge/discharge circuit
Figure 2-44 shows the
chargeidischarge circuit,
VH
A
R35
~Mnchage
CHG
o
AAA
Q3
DCH
ALDCHG
HI-48
DSCHG
yPDl 6322 (IC8, 9)
Rs
o
G
o-
0-
- 1
GH
Figure 2-44. Charge/Discharge Circuit
< Charge pulse >
When the gate array
(E05A65) outputs HIGH pulse from CHG port, the transistors (Q3,9) go ON and
thus the Vh voltage charges the
piezoelectric elements (PZD) through the diode (DCH) and resistor (RCH).
Figure 2-45 shows the head condition at this time.
/
Piezoelectric Element
=
Figure 2-45. Head Charge Condition
< Discharge pulse >
The data for 48 nozzles stored in the gate array
(E05A65) is serially transmitted from HDDAT port to
the printhead drive
IC (pPD 16322). Following this, the discharge pulse is transmitted from E05A65
to
KPD 16322. The KPD 16322 then discharges PZD according to the print data to cause the nozzles
to inject ink.
(PZD is always charged by Vh.)
For cleaning operation, the
E05A65 sends ALDSCHG signal to pPD 16322, which automatically
discharges ail the
piezoelectric elements to cause all the nozzles to inject ink.
Figure 2-46 shows the nozzle in discharge condition.
Figure 2-46. Head Discharge Condition
2-35