Part 4TECHNICALREFERENCEPage4 - 1 1. OVERVIEW4 - 1 1.1 Printer Block Diagram4 - 2 1.2 Initial Flowchart4 - 5 1.3 Power OFF Operation Flow4 - 6 1.4 Print Signal Flow4 - 7 1.5 BJ Cartridge Drive4 - 8 2. FIRMWARE4 - 8 2.1 Interface4 -10 2.2 Printing Modes4 -14 2.3 Optimum Printing Control4 -15 3. PRINTER MECHANISM4 -15 3.1 Overview of the Mechanical System4 -17 3.2 BJ Cartridge4 -24 3.3 Purge Unit4 -28 3.4 Cartridge Unit4 -30 3.5 Paper Feed/Sheet Feeder Section/Cassette Sections4 -36 4. PRINTER ELECTRICAL SYSTEM4 -36 4.1 Overview4 -37 4.2 Logic Section4 -41 4.3 Power Supply Section4 -43 5. DETECTION FUNCTIONS4 -43 5.1 Sensor Functions4 -45 5.2 Other Detection Functions