Hitachi IJ UX, Service Manual

Page: 93 / 308

3-13
3.3 Engine part
- With regard to the electric parts/control board of the engine part, the functional
outline, the setting of the switch, the list of the check point and the note at the
replacement are described.
3.3.1 EZJ126 board (MPU board)
[Function]
- Performs printing control, circulation system control, nozzle control (charge
voltage, excitation voltage, auto phase and the like) and communication.
- Stores the user data (printing data, substitution rules) and operation
management information.
- EZJ126 board with the revision "D" onwards must be used on UX series.
[Setting of the switch, Check point, LED display etc]
- There is no check point with regard to setting of the switch or LED display.
- Check point
Reference number Name Content
TP321 PGND Ground
TP787 Sensor-N Signal of senor
TP774 Encoder-N Signal of encoder
TP1427 Print-in-progress Signal of Print-in-progress
[Notes in case of the EZJ126 board replacement]
[ Replacement procedure of EZJ126 board ]
(1) Save the data on the USB memory by using the copy data function.
(From the IJP to the USB memory)
(2) Turn off the power.
(3) Open the control panel and remove connection cable and battery on the
EZJ126 board and EZJ125 board.
(4) Remove EZJ125 board. When EZJ130 board is installed, remove EZJ130.
(5) Remove the cover of High voltage power supply, and then remove the EZJ126
board.
(6) Remove the model key from old EZJ126 board and install that key to new
EZJ126 board (CN25).
(7) Replace the EZJ126 board.
(8) Attach the cover of High voltage power supply, then attach connection cable and
battery to the EZJ126 board and EZJ125 board.
(9) Turn on the power with system data USB memory inserted.
Downloading will be performed automatically.
(10) After turning on the IJP, the messages of
「
Memory Fault M
」
「
Print Data/Setting Notice
」
are displayed on screen display.
Please close the messages to touch the
「
Close
」
button.
(11) Execute “System reset” on the second page of the service maintenance screen.
(12) Confirm “Serial number” on the “Unit information” screen and then confirm the
date and time.
- When replacing EZJ126 board, system data USB memory is necessary.
System data USB memory is a memory that stores the latest version of software.
By executing download, software versions of EZJ128 and EZJ126 will be matched.
If download is not executed, it might cause unstable operation due to mismatching
of the software versions of EZJ128 and EZJ126.
- Saving of user data is necessary.
Save the data to USB memory by using the following procedure before replacing
the EZJ126 board, and recover the data after the replacement.
The same memory can be used for both System data USB memory and Backup
USB memory. Use USB memory (1GB or larger), which is commercially available.
- When replacing the EZJ126 board, be sure to perform “System reset” according to
the following procedure.
- Before replacing boards, be sure to turn off the power.
- After replacing boards, be sure to joint connectors to right places.
- Model key and Language key has the unit specific data. Be sure to remove the
model key and language key from old EZJ126 board and install that key to new
EZJ126 board.
Caution
!
As for the System
reset, see “2.8 System
reset”.
With respect to the
replacement procedure of
EZJ125, refer to “3.3.6
EZJ125 board”.
As for the copy data
function, see “2.9
Backup”.
As for the Unit
Information, see “2.10
Unit information”.
With respect to the
replacement procedure of
EZJ130, refer to “3.3.12
EZJ130 board”.