IJ4000 Impulse Jet
Section 4: Troubleshooting
5765-018 Operations Manual Rev J
Page 41
Impulse Jet Print Head (continued):
Photosensor Sensitivity Test
This test will determine if the photosensor sensitivity is adjusted correctly for the application.
1. Place object approximately 6,4mm (.25in) in front of photosensor; photosensor should sense object.
2. Place object near the center of the guide rails; photosensor should sense object.
3. Place object on far guide rail; photosensor should not sense object.
4. Check that objects on the far side of conveyor do not trip the photosensor.
5. Check that color differences in product do not cause multiple photosensor trips at the farthest sensing distance.
NOTE:
The test object should be a sample of the actual product. For photosensor sensitivity adjustment procedure, refer to the photosensor
manufacturer’s instructions.
NOTE:
If the red LED on the photosensor fails to illuminate when an object is placed in front of (but not touching) the photosensor, it indicates
that the photosensor is disconnected, or the power supply or photosensor has failed.
System Symptom
Possible Cause
Operational Test Method
Ink Reservoir in Print Head does not
refill, or no ink pumps out during an
ACS or Prime cycle. (768E)
(Continued.)
PC Board
Check the LED indicators on the board.
LED2: Green; indicates Print Head is requesting S
MART
-IDS to
turn Liquid Pump on.
LED9: Green; indicates Intake Solenoid Valve is open.
LED8: Green; indicates Print Head Reservoir is full.
LED3: Green; indicates Print Head Reservoir is low and Ink Out
Timer has expired.
Print Head will not print. (768E)
PC Board
Make sure all print head cables and the print engine cable are
seated at each end. Check the Test Points and LED indicators on
the board.
TP1: High voltage supply to driver IC (U9). The voltage level is
set via a sense resistor in the print engine (40-150 VDC).
LED6: Green; indicates high voltage is low.