Service manual

SERVICE MANUAL

Figure Title Page

Fig. 2.10 Carriage Motor Drive Circuit................................................................................ 2-12

Fig. 2.11 Line Feed Motor Drive Circuit ............................................................................. 2-13

Fig. 2.12 Carriage Home Position Sensor Circuit............................................................... 2-14

Fig. 2.13 PE Sensor Detection Circuit ............................................................................... 2-14

Fig. 2.14 External View of the Switch PCB ........................................................................ 2-15

Fig. 2.15 Switch PCB Circuit ............................................................................................. 2-15

Fig. 2.16 Key/FPC Operation ............................................................................................ 2-16

Fig. 2.17 Electrode Wiring ................................................................................................. 2-17

Fig. 2.18 Keyboard Control Circuit..................................................................................... 2-18

Fig. 2.19 Keyboard Matrix ................................................................................................. 2-19

Fig. 2.20 Keyboard Symbols (Corresponding to Keyboard Matrix in Fig. 2.19)................... 2-19

Fig. 2.21 LCD Display Operation Block Diagram................................................................ 2-20

Fig. 2.22 Example of Control Signal Timing Chart.............................................................. 2-21

Fig. 2.23 LCD Drive Voltage Generation Circuit (Minus Voltage VEE)................................ 2-22

Fig. 2.24 LCD Drive Voltage Generation Circuit (Plus Voltage VEE).................................. 2-22

Fig. 2.25 CFL Backlight Circuit .......................................................................................... 2-23

Fig. 2.26 FDD Block Diagram............................................................................................ 2-25

Fig. 3.1 Troubleshooting Flowchart.................................................................................... 3-4

Fig. 3.2 Troubleshooting Flowchart (continued) ................................................................. 3-5

Fig. 3.3 Serial Number Entry Display............................................................................... 3-14

Fig. 3.4 Self-Print Pattern................................................................................................ 3-15

Fig. 3.5 Results of Self-Print Test.................................................................................... 3-17

Fig. 3.6 Self-Test Menu................................................................................................... 3-18

Fig. 3.7 LCD Test Menu .................................................................................................. 3-20

Fig. 3.8 CHECK Test Display (magnified)........................................................................ 3-21

Fig. 3.9 CROSS Test Display (magnified)........................................................................ 3-22

Fig. 3.10 BLACK Test Display........................................................................................... 3-23

Fig. 3.11 DISP Q Test Display (magnified) ........................................................................ 3-24

Fig. 3.12 Slant Line Test Display (magnified)..................................................................... 3-25

Fig. 3.13 Printer Check #1 (in progress) Display................................................................ 3-26

Fig. 3.14 Diagram of Print Test Pattern 1 .......................................................................... 3-27

Fig. 3.15 Sample Print Test Pattern 1................................................................................ 3-28