Diagraph I.V./700, Service Manual

Page: 23 / 50

5750-212
Revision A
Page 23
coming from that channel, then the ink jet
orifice remains blocked. Remove the obstruc-
tion with a broach Kit (P/N 1902-857, shown
below).
Q12 The I.V./700 is printing the correct
message but all of the ink dots are too
small. Why?
S12 The ink pressure is too low. Follow the pro-
cedure in this section to adjust the regulator
and the ink flow in the printhead.
You will need a Phillips screwdriver, a multi-
meter and a fresh can of ink (5750-085) for
this adjustment. Disconnect the power be-
fore starting.
1. Remove the printhead cover to access test
points on the printhead driver board.
2. Attach the black lead from the multimeter
to the bare wire (pin 16, [A]) of the cable
connecting the CPU board to the driver board
(see diagram below).
3. Attach the red lead of the multimeter to
test point 3 (TP3, [B]) on the driver board.
4. Set the mulitmeter to DC voltage.
[A]
[B]
5. Install the new can of ink into the control-
ler recepticle.
6. Power ON the I.V./700 and wait for a menu
to appear.
7. Check the mulitimeter display; you should
see a value in the range of 5 to 8 volts DC.
8. Lift the lock ring on the regulator and
slowly turn the adjustment knob counterclock-
wise. The vol-tage reading should decrease
as you turn the knob.
9. Turn the knob counterclockwise until it
stops and shuts off the ink flow. The multi-
meter should show zero volts.
10. Place absorbent material or a container
in front of the printhead and purge until the
ink low lamp flashes.
11. Turn the regulator knob slowly clockwise and
watch the voltage increase on the multimeter.
12. Stop turning the knob when the multim-
eter reads 7.0 volts.
13. Press the regulator locking-ring back into
place; disconnect power and the multimeter
leads; and replace the printhead cover.
[8]
[13]