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2.2 Electronic Assemblies
The basic configurations of the electronic assemblies are described below:
1) Input
circuit
This assembly supplies voltage through the power cord, transformer, and power switch.
2)
Control PCB (power supply smoothing circuit and drive circuit)
In the power supply smoothing circuit AC voltage is transformed into DC voltage. In the drive
circuit, the ICs (such as the CPU and SRAM) and transistors drive and control the stepping
motors, hammer solenoid, etc.
The store data is stored in SRAM.
The LCD displays text and information on functions.
3) Keyboard
The keyboard assembly consists of the keyboard panel, membrane sheet (8 × 8 key matrix),
keyboard support panel, and key tops.
4)
Actuator and left end switch
The carrier, platen, selection, and ribbon/correction tape mechanisms are driven by four
stepping motors, while the hammer solenoid (printing mechanism) moves the hammer.
The left end switch detects the carrier home position and reports it to the CPU.
2-2
Summary of Contents for Carrera De Luxe MD
Page 14: ...3 2 Keyboard Keyboard layout Keyboard contact layout membrane sheet 3 3 ...
Page 15: ...Keyboard contact diagram keyboard matrix 3 4 ...
Page 19: ...3 5 LCD LCD layout Epson ECM A0697 type JIC MSBZ9129 type 3 8 ...
Page 20: ...LCD block diagram Epson ECM A0697 type JIC MSBZ9129 type 3 9 ...
Page 21: ...3 6 Control PCB Control PCB layout Original version Control PCB Artwork No 999 32300 3 10 ...
Page 22: ...2nd version Control PCB Artwork No 999 35810 3 11 ...
Page 23: ...3 12 Control PCB diagram Original version Control PCB Artwork No 999 32300 ...
Page 24: ...2nd version Control PCB Artwork No 999 35810 Page 1 3 3 13 ...
Page 25: ...2nd version Control PCB Artwork No 999 35810 Page 2 3 3 14 ...
Page 26: ...3 15 2nd version Control PCB Artwork No 999 35810 Page 3 3 ...
Page 30: ...4 4 ...
Page 37: ...Correction tape Ribbon tape 4 11 ...
Page 42: ...5 3 ...
Page 45: ...5 6 ...
Page 47: ...Original version Control PCB Artwork No 999 32300 5 8 ...
Page 48: ...2nd version Control PCB Artwork No 999 35810 5 9 ...
Page 52: ...5 13 ...
Page 55: ...5 16 ...
Page 58: ...5 19 ...
Page 61: ...5 22 ...
Page 63: ...5 24 ...
Page 68: ...Chassis frame and platen 6 2 ...
Page 69: ...Carrier drive Hammer solenoid 6 3 ...
Page 76: ...Printed in Japan 001 03139 03 090616 FN AX160VF OP ...