Lexmark Jetprinter 4079-00 series, Service Manual

Page: 42 / 183

2-24
4079-00X
Ink Flow Service Check
Important: A long cleaning uses a significant amount of ink. To min-
imize ink flow while you troubleshoot ink flow problems, it is helpful
to be familiar with normal ink flow. If needed, study the
“Ink Supply
Diagram” on page 5-6 , and the text on the following page. Start with
the flow of ink from the ink cartridge.
It is also helpful to be familiar with this service check. Read the
entire service check to become familiar with the parts you need to
check. Check as many parts as possible during the long cleaning
rather than performing a long cleaning for each step.
Symptom Explanation
Conditions That Could Cause This
Symptom
You have no ink flow, with
no error code displayed. • Ink Cartridge Supply Lines
• Carriage supply and waste lines
• Purge waste lines
• Ink cartridge waste lines
• Purge Unit
• Ink supply assembly
• Printhead
FRU Action
1 • Carriage Ink
Supply
Assembly
• Ink Cartridge
Supply Lines
Perform a Long Cleaning. Be sure the carriage sup-
ply lines are full of ink at the cartridge assembly con-
nection (smaller lines). If they are not, check the
carriage ink supply line for blockage. Follow the lines
to see whether they are filled or empty.
2 Purge Unit Be sure the purge assembly motor is operating nor-
mally. If it is not, replace it.
Be sure the carriage waste lines at the purge
assembly connector are full of ink. If they are not,
replace the carriage ink supply assembly (Asm.
10-1).
Be sure ink flows through the large purge waste
lines when the purge motor runs. If it does not,
replace the purge unit.