Hitachi UX Twin Nozzle Service Manual page 274

6.2.18b (N2)Ink Heating Unit Over Current
(N2)Ink Heating Unit
Over Current
Is the PTC resistance
measured (between the
EZJ133 board TP3 and TP24)
lower than 23 ?
Yes
Replace the heating unit.
▪ Clear the fault.
▪ From the maintenance screen, place
the heating unit in the operating mode. *)
▪ Restart the IJ printer.
Does the fault recur?
Yes
Replace the EZJ133 board*2.
▪ Clear the fault.
▪ From the maintenance screen, place
the heating unit in the operating mode. *)
▪ Restart the IJ printer.
Does the fault recur?
Yes
Replace the print head*3.
- On detecting this fault, the IJ printer automatically sets the "Ink temperature
correction" to (disable).
"System environment setup: Ink temperature correction (enable)  (disable)"
After getting rid of the fault, reset the Ink temperature correction to (enable).
"System environment setup: Ink temperature correction (disable)  (enable)"
- In the condition of the "Ink temperature correction (disable), " the "Ink Temperature
Correction Notice" message appears each time the power is turned on.
(See "1.6 Heating of Ink" in the Instruction manual".)
No
*1
No
No
Resume the
operation.
Caution
!
6-32
(*1): When you replace Heating unit, refer to "5.6 Heating
unit replacement".
(*2): When you replace EZJ133 board, refer to
procedures of EZJ133 board]
(MPU board)".
(*3)： When you replace the printhead, refer to
Head Replacement Procedure".
[Caution]
Be sure to check that there is no wrong connection of
harnesses by referring to
method of harnesses]
Diagram".
*) Refer to the
following caution.
*) Refer to the
following caution.
[Replacement
"3.3.1 EZJ133 board
in
"4.13 Print
[Connector numbers and Identifying
in "3.3.20 Electrical Connection