Ezj125 Board (Nozzle Drive Board) - Hitachi IJ RX2 Service Manual

With respect to the
charging voltage
confirmation, refer to
"2.3.2 Charging voltage
confirmation".
With respect to the
excitation adjustment,
refer to "2.3.1 Excitation
adjustment".
With respect to the auto
phase gain adjustment,
refer to "2.3.4 Auto phase
gain adjustment".

3.3.6 EZJ125 board (Nozzle drive board)

[Function]
- Control of nozzle (charging voltage control, excitation voltage, APH detection, PTC
control and the like) is performed.
[Setting of switch/check point/LED display and the like]
- Setting of switch
Nozzle size
DSW1
Set both bits up.
DSW2
Set both bits up.
- Check point/ LED
Reference
number
TP1 APH signal
TP3 GND
TP12 Charging
signal
TP14 Excitation
signal
TP15 PTC signal
LED1 APH signal
[Note in case of the EZJ125 board replacement]
- When replacing boards, be sure to turn off the power.
- Set up DSW1 and DSW2 according to the nozzle diameter.
- After replacing the board, confirm the charging voltage.
- Perform the excitation adjustment and the auto phase gain adjustment.
- When removing the connector from CN2, CN3 and CN5, hold the socket housing and
pull it out in straight.
[Replacement procedure of EZJ125 board]
(1) Turn off the power.
(2) Remove the protective cover.
*) As the drawing below, push the hook of fixing spacer with finger and pull up the
protective cover. (Two spacers)
65µm
Mark
Mark
Name
Charged amount detection signal of ink drops
Ground
Character signal charging ink drops
Sine wave signal applied to a nozzle
PTC drive signal
For APH signal check with eyes
Hold the socket housing
Connector on board
Push the hook
Pull up
the cover
3-18
Contents
Protective cover
Spacer for fixing
the protective cover
EZJ125 board