Epson DLQ-3000+ Service Manual page 61

2.1 Printer Mechanism Operating Principles .......................................... 2-1
2.1.1 Printing Mechanism ................................................................... 2-1
2.1.2 CR (Carriage) Mechanism.......................................................... 2-3
2.1.3 PG (Platen Gap) Adjustment Mechanism ................................. 2-4
2.1.4 Ribbon Feed/Ribbon Shift Mechanism ..................................... 2-6
2.1.4.1 Ribbon Feed Mechanism.................................................. 2-7
2.1.4.2 Ribbon Shift Mechanism................................................... 2-7
2.1.5 Paper Feed Mechanism ............................................................. 2-9
2.1.5.1 Core of the Paper Feed Mechanism ................................. 2-9
2.1.5.2 Paper Feed Sensor Mechanism ..................................... 2-10
2.1.5.3 Release Mechanism ....................................................... 2-12
2.2 Circuit Operating Principles............................................................. 2-13
2.2.1 Power Supply Voltage.............................................................. 2-13
2.2.2 Power Supply Circuit Operation ............................................. 2-14
2.3 Controller Circuit .............................................................................. 2-15
2.3.1 Interface Circuit........................................................................ 2-17
2.3.2 Reset Circuit ............................................................................. 2-18
2.3.3 Memory Back-up Circuit .......................................................... 2-19
2.3.4 Ribbon Motor Controller/Driver Circuit .................................. 2-20
2.3.5 PF (Paper Feed) Motor Controller/Driver Circuit.................... 2-21
2.3.6 CR (Carriage) Motor Controller/Driver Circuit........................ 2-22
2.3.6.1 Bi-D Adjustment Function ............................................... 2-24
2.3.6.2 Interlock Function ........................................................... 2-24
2.3.7 Printhead Controller/Driver Circuit ......................................... 2-25
2.3.8 Control Panel Circuit................................................................ 2-26
2.3.9 PG (Platen Gap) Motor Driver Circuit ..................................... 2-27
2.3.10 Paper Thickness Detecting Circuit ....................................... 2-28
2.3.11 Paper Jam Sensor .................................................................. 2-29
Operating Principle
Chapter 2