Hitachi UX Twin Nozzle, Service Manual

Page: 127 / 355

3-51
3.3.16 High Voltage Power Supply 1 and 2
[Function]
- Deflection voltage output : DC 5.7kV Max.
Charge signal source voltage output : DC500V
[Note at the replacement]
- When replacing the high voltage power supply, be sure to turn off the power.
- If the high voltage line is dusty, a fault may occur due to a leakage of high voltage.
Wipe the dust off the line in the case where it is dusty.
- When connecting the deflection voltage output connector, be sure to joint the connector
to right position.
[Replacement procedures of High voltage power supply1 and 2]
(1) Turn OFF the main power switch and open the maintenance door.
(2) Remove the protective cover
(3) Remove EZJ134 board with the metal plate which fixes the board.
(Refer to steps of (3) to (4) of [Replacement procedures of EZJ134board] in "3.3.6
EZJ134 board (Nozzle 2 drive board)")
(4) Remove the connectors of the control signal inputs the deflection voltage output, and the
charge source voltage output.
(5) Remove the fixing screws(2pcs) and the fixing spacers(2pcs), and the remove High
voltage power supply.
(Fixing positions and method are the same for High voltage power supply1 and 2.)
(6) Replace High voltage power supply with a new one, and then reassemble the removed
parts in the reverse order of the procedures above.
Check the clamping positions of the harnesses.
(7) Turn main power ON.
Check if the respective nozzle can conduct print operation properly
Caution against an electric shock
Be sure to turn main power OFF before accessing High voltage power supply in order to
avoid electric shock, because high voltage is applied on the areas of High voltage power
supply.
With respect to the
clamping position of wire
harness, r
efer to “3.3.20
Electrical connection
diagram
”.
Deflection voltage output
(DC5.7kV MAX)
Charge source
voltage output
(DC500V)
Fixing screw
Fixing spacer
Fixing
screw
Fixing screw
High voltage line
Control signal inputs
High voltage power supply1
：
Connect to CN6 on EZJ125
board
High voltage power supply2
：
Connect to CN37 on EZJ133
board
High voltage power supply1
：
Connect to CN4 on EZJ125
board
High voltage power supply2
：
Connect to CN2 on EZJ134
board
For the procedures of
EZJ134 board
replacement, refer to
"3.3.6 EZJ134
board(Nozzle 2 drive
board)".
High voltage
power supply1
High voltage
power supply2