General - Brother MP-21C Service Manual

1. GENERAL ---------------------------------------------------------------------- II-1
1.1 Normal Interlace Processing (360dpi) ----------------------------------------------- II-1
1.2 Super Fine Interlace Processing (720dpi) ------------------------------------------ II-2
2. ELECTRONICS -------------------------------------------------------------- II-3
2.1 General Block Diagram (MP-21C/MP-21CDX) ------------------------------------ II-3
2.2 Electrical Configuration ------------------------------------------------------------------ II-4
2.3 Main PCB ----------------------------------------------------------------------------------- II-5
2.3.1 Data Reception -------------------------------------------------------------------- II-5
2.3.2 Control Panel ----------------------------------------------------------------------- II-5
2.3.3 Paper Feed and Carriage Motor Drive Circuit ------------------------------ II-6
2.3.4 Paper Sensor ----------------------------------------------------------------------- II-7
2.3.5 Cartridge Detection --------------------------------------------------------------- II-8
2.3.6 Head Voltage Control ------------------------------------------------------------ II-9
2.3.7 Home Position Detection of the Maintenance Mechanism -------------- II-9
2.3.8 Memory Circuit --------------------------------------------------------------------- II-9
2.4 Head PCB ---------------------------------------------------------------------------------- II-9
2.5 Carriage PCB ------------------------------------------------------------------------------ II-9
2.6 Carriage Sensor PCB -------------------------------------------------------------------- II-9
2.7 Power Supply ---------------------------------------------------------------------------- II-10
3. MECHANICS ---------------------------------------------------------------- II-11
3.1 Overview of Printing Mechanism ---------------------------------------------------- II-11
3.2 Print Head -------------------------------------------------------------------------------- II-12
3.3 Ink Cartridge ----------------------------------------------------------------------------- II-14
3.4 Head Maintenance Mechanism ----------------------------------------------------- II-15
3.4.1 Components and Functions -------------------------------------------------- II-15
3.4.2 Mechanism ----------------------------------------------------------------------- II-15
3.5 Sensors ----------------------------------------------------------------------------------- II-16
3.5.1 Top Cover Sensor --------------------------------------------------------------- II-16
3.5.2 Paper Feed Sensor, Paper Eject Sensor ---------------------------------- II-17
3.5.3 Maintenance Sensor (Purge Unit) ------------------------------------------- II-19
3.6 Carriage Drive Mechanism ----------------------------------------------------------- II-20
3.7 Paper Feed Mechanism --------------------------------------------------------------- II-21
CONTENTS
PR99052