Hitachi IJ RX2 Service Manual Download

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3-12

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.

- Control panel for RX2-S is EZJ126A, control panel for RX2-B is EZJ126B

[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

「

」

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, ref

er to “3.3.6

EZJ125 board

”.

As for the copy data
function, see

“2.9

Backup