Printronix SL4M User Manual

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14
Chapter
1
Thermal Printer Technology
Thermal Printer Technology
Quiet and fast, with excellent print quality, your multifunction thermal printer 
uses an inline thermal printhead. The thermal printer operates differently from 
a line matrix or laser printer, because the thermal printer uses a printhead with 
heating elements and special paper or ribbon.
The Printing Process
The thermal printhead allows two modes of operation:
Direct Thermal
During
 direct thermal printing, the thermal printhead selectively heats 
small, rectangular
 thermal dots. When these contact the coated thermal 
paper, the dyes and developers in the coating react to the heat and 
develop an image. This mode of printing is generally used for short-term 
labeling applications.
Thermal Transfer
During thermal 
transfer printing, the heated thermal dots contact a 
thermal ribbon. The heat reacts with the ribbon and bonds the image to 
the paper. This method is used especially for abrasive, long-storage 
applications and for specialized applications, such as in extreme 
environmental conditions or where tamper-proofing is required.
Manual Conventions
Operator panel keys are often shown by their symbol or icon (located on 
the control panel directly below the key).
Example: Press the 
 key for ENTER.
LCD fault messages display the specific fault in uppercase letters. 
A corrective action in upper and lowercase letters displays below the fault 
message.
Example: PAPER 
OUT
Load Paper
Key combinations are indicated by the + (plus) symbol.
Example: Press the Up key Down key at the same time
.