Epson MX-80 Technical Manual page 5

LIST OF FIGURES
CHAPTER 1
GENERAL
Fig. 1.1 M-3210 Printer Mechanism: ..........................•............... 1-3
Fig. 1.2 Main and Driver Circuit Boards ........................................ 1-3
Fig. 1.3 Power Supply Circuit ................................................. 1-4
Fig. 1.4 Upper and Lower Cases .............................................. 1-4
CHAPTER 2
PRINCIPLES OF OPERATION
Fig. 2.1 Flow of Signals ....................................................... 2-1
Fig.2.2 Component Layout of Fuse
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Filter Circuit ............................. 2-9
Fig. 2.3 Connection Diagram of Fuse
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Filter Circuit ........................... 2-9
Fig. 2.4 Windings of Transformer .............................................. 2-10
Fig. 2.5 Rectifier and Constant-Voltage Circuit ................................. 2-10
Fig. 2.6 Flow of Data and Signals through 8155 ............................... 2-12
Fig. 2.7 8155 and Peripheral Circuits .......................................... 2-12
Fig. 2.8 Data Transfer SeQuence ........................ ; ..................... 2-13
Fig.2.9 Carriage Stepper Motor Drive Signals (Forward) ....................... 2-14
Fig. 2.10 Paper Feed Stepper Motor Drive Signals ............................... 2-14
Fig. 2.11 8041 and Peripheral Circuits .......................................... 2-15
Fig. 2.1 2 Signal ALE ........................................................... 2-16
Fig. 2.13 8049 and Program Memory Circuits ................................... 2-16
Fig. 2.14 Locations of DIP Switches ............................................ 2-17
Fig. 2.15 DIP Switch Status Read Circuit ....................................... 2-17
Fig. 2.16 Reset (HP Sensor) Circuit. ............................................ 2-18
Fig. 2.17 Timing (PTS) Sensor Circuit .......................................... 2-18
Fig. 2.18 Timing and Reset Detection Signals ................................... 2-19
Fig. 2.19 Driver Circuit ......................................................... 2-19
Fig. 2.20 Current Waveform of Print Head ....................................... 2-20
Fig. 2.21 Applied Voltage vs. Driving Pulse Width ............................... 2-20
Fig. 2.22 Switches and Indicators on control PaneL ............................. 2-21
Fig. 2.23 Switch and Indicator Control Circuit ................................... 2-22
Fig. 2.24 Operation of Print Head ............................................... 2-23
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