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Unit 6: Maintenance
Lt408 Operator Manual
6-3 PN: 9001152A
REPLACEMENT PROCEDURES
This unit provides in-depth instruction on all primary component and assembly replacement, in addition to most
secondary components. Use the text in conjunction with their accompanied graphics to ensure complete
comprehension throughout the process. Especially observe all cautionary or warning notations.
FUSE REPLACEMENT
Fuse access may be gained externally without having to remove covers, etc. The fuse is located on the printer’s
underside adjacent to the power supply cord connector. To inspect or replace the fuse, simply twist off the cap and
the fuse will exist with it.
PRINT HEAD REPLACEMENT
If the print head becomes damaged or worn, it can be easily removed and replaced without having to make critical
adjustments. Before replacing the print head, check the head counter values by printing a test pattern. Instructions
relating to the Head Counter may be found in the Configuration unit of this manual.
1. Switch off the printer and observe applicable lockout-tagout procedures.
2. Open the front cover and the print head release lever.
3. Pull outward on print head release knob (1, Figure 6-2) to release defective print head (2) from print
assembly (3). Disconnect the two wiring harnesses.
4. Reconnect two wiring harnesses (not shown) to replacement print head (2).
5. Pull and hold outward on release knob (1) while applying replacement print head (2) to print assembly (3).
6. Restore power, reset the head counter, and test print.
Figure 6-2, Print Head Replacement
NOTE: Each of the printer’s wiring harness connectors are different from all others to
ensure proper mating. Mate each matching half for reconnection.
CAUTION: THE BRACKETS ON EACH END OF THE PRINT HEAD MUST SNAP
INTO POSITION ON THE RELEASE KNOB’S SHAFT. ENSURE THE PRINT HEAD
IS SECURELY AND PROPERLY INSTALLED PRIOR TO OPERATING THE
PRINTER TO PREVENT MECHANICAL DAMAGE.