Hitachi UX Twin Nozzle Service Manual page 29

№
The connection of the EZJ133 board and EZJ125 board is insufficient.
1
(Nozzle 1)
The connection of the EZJ133 board and EZJ134 board is insufficient.
(Nozzle 2)
The dip switch on the EZJ125 board is incorrectly set.(Nozzle 1)
2
The dip switch on the EZJ134 board is incorrectly set.(Nozzle 2)
The connection of the coaxial cable connector for excitation (EZJ125 CN5：
3
Nozzle 1, EZJ134 CN7：Nozzle2) is insufficient.
Replacement parts are out of order (EZJ133/EZJ125/EZJ134 board, nozzle,
4
head cable).
EZJ125 board work "A" and EZJ 125 work "B" is faultily installed the wrong way
5
around.
When you press Manual adjustment and manually input the excitation voltage adjustment
value, the excitation voltage value is increased or decreased. Check the waveform of TP14
(excitation voltage ： Nozzle 1) on the EZJ125 board and TP3(excitation voltage ： Nozzle 2) on
the EZJ134 board with an oscilloscope.
For the position of the board and test pins, refer to "3.3.5 EZJ125 board" and
"3.3.6 EZJ134 board".
[Waveform of excitation voltage]
Vp-p
Nozzle diameter (μm)
Main causes of automatic adjustment failure
Cause
65
2-7
V
p-p
360±20V