SECTION 5 Troubleshooting
5–8 0855855eng 6/08
Symptom Possible Cause / Problem Reference / Action
Ink Delivery Module
(IDM) (continued)
Holding chamber Check that the filter screws 
are tightly secured to the 
holding chamber.
Check for broken filter O-ring. 
Replace if necessary.
Check for broken pump piston 
O-ring. Replace if necessary.
Ink line connection Tight or broken ink adapter 
fitting
IN, 2, Connecting the Ink Line 
Inside the Enclosure
Ink Delivery Module 
(IDM) Will Not Heat
Open hold or melt over-
temperature thermostat 
(device opens at 149°C).
Push appropriate thermostat 
button to reset.
Failed hold or melt thermistor 
(device should read 
approximately 100k ohms at 
25°C)
SE 4, Ink Delivery Module; 
Melt Thermistor
SE 4, Ink Delivery Module; 
Hold Thermistor
Failed hold heater (device 
should read 36 ohms)
SE 4, Ink Delivery Module; 
Hold Heater
Failed melt heater (device 
should read 72 ohms)
SE 4, Ink Delivery Module; 
Melt Heater
Electrical connection 5200/5400 Block Diagram
Failed I/O Panel assembly 
(backplane)
SE, 6, Replacing the I/O Panel 
Assembly
Incorrect line voltage IN, 2, Electrical
IN, 2, Changing the Voltage 
Configuration
Cannot Read Display
Heartbeat LED on
Control Board blinks
Incorrect contrast setting OP, 5, Unreadable Display
Hold down STOP key and 
press Up-Arrow to lighten or 
Down-Arrow to darken 
display.
SE, 4, User Interface; 
Contrast
Electrical connection 5200/5400 Block Diagram
Verify electrical connections 
inside User Interface 
enclosure and test for 14VDC 
at UI Interconnect Board.