Olympia Carrera De Luxe MD, Руководство по обслуживанию

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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.
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