Service manual
Figures
Figure 2-1.
Figure 2-2.
Figure 2-3.
Figure 2-4.
Figure 2-5.
Figure 2-6.
Figure 2-7.
Figure 2-8.
Figure 2-9.
Figure 2-10.
Figure 2-11.
Figure 2-12.
Figure 2-13.
Figure 2-14.
Figure 2-15.
Figure 2-16.
Figure 2-17.
Figure 2-18.
Figure 2-19.
Figure 2-20.
Figure 2-21.
Figure 2-22.
Figure 2-23.
Figure 2-24.
Figure 2-25.
Figure 2-26.
Figure 2-27.
Figure 2-28.
Figure 2-29.
Figure 2-30.
Figure 2-31.
Figure 2-32.
Figure 2-33.
Figure 2-34.
Figure 2-35.
Figure 2-36.
Figure 2-37.
Figure 2-38.
Figure 2-39.
Figure 2-40.
,Figure 2-41.
Figure 2-42.
Figure 2-43.
Figure 2-44.
Figure 2-45.
Figure 246.
Figure 2-47.
Figure 2-48.
Figure 2-49.
Cable Connections
....................................................
2-2
Printer Mechanism Block Diagram..
.......................
2-3
Paper End Sensor
.....................................................
2-4
Home Position Sensor
..............................................
2-5
Thermal Sensor........................................................
2-5
Printhead.. ................................................................
2-6
Circuit Block Diagram
.............................................
2-7
Memory Map (64KB)
................................................
2-8
Power Supply
Circuit Block Diagram..
....................
2-10
Step Down Circuit
....................................................
2-11
Step Down Timing
....................................................
2-12
PEBFIL-II Filter Circuit Board................................
2-13
Transformer Circuit
.................................................
2-14
Rectifier and Smoothing Circuit
..............................
2-15
+5 VDC Regulator Circuit.......................................
2-16
Oscillator Waveform
.................................................
2-17
Constant Voltage Control Circuit
............................
2-17
AMP1 Output Control (+5 VDC)
.............................
2-18
NJM2355 Internal Circuit
.......................................
2-19
Output Transistor Drive Waveform..
.......................
2-20
+24 VDC Regulator Circuit
.....................................
2-21
Constant Voltage Control
(+24 VDC).
.....................
2-22
Over-Current Protection ..........................................
2-23
Vx Voltage Circuit
...................................................
2-24
Reset Circuit
.............................................................
2-25
-RESET Output
......................................................
2-26
-RESET Pulse Oscillation Process
After ROM Cartridge Installation
........................
2-27
-RESET pulse Oscillation Process
After ROM Cartridge Removal .............................
2-28
Carriage Mechanism.. ..............................................
2-30
Carriage Motor Drive Circuit Block Diagram
......... 2-31
Gate Array Operation, 2-2 Phase Excitation..
.........
2-32
Carriage Motor Drive Circuit...................................
2-33
STK-6981B Circuit Diagram....................................
2-34
Reference Voltage Generation Circuit..
...................
2-35
Constant Current Control Circuit ...........................
2-36
Chopping Waveforms ...............................................
2-37
Schmitt Trigger Circuit............................................
2-38
Chopping
Current
and Drive Speed..
.......................
2-40
Home Position Seek
.................................................
2-41
Printing Area and Print Timing
..............................
2-42
Friction Feeding .......................................................
2-43
Sprocket Feeding......................................................
2-44
Paper Feed Motor Drive Circuit
...............................
2-45
Paper Feed Motor Drive Timing Chart..
.................. 2-46
Printing ....................................................................
2-47
Printhead Drive Circuit Block Diagram..
................
2-48
Gate
Array E05A02 Block Diagram
........................
2-49
Printhead Drive Circuit ...........................................
2-50
Print Timing
.............................................................
2-51
2-ii
LQ-200/AP3000