Sharp UX-A1000, Руководство по обслуживанию

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UX-A1000U
[4] Circuit description of Printer PWB
1. Block diagram
Fig. 8
SCE214V
µ
PD65944
HURRICANE
THUNDERBOLT
PRINTER
HEAD
PCLK
PLAT
MAIN CLOCK
PDAT
FD
MOTOR
11.82V
CONTROL
SIGNAL
CR
MOTOR
PD(8:1)
SERIAL TRANSFER
2. Circuit description
The printer control unit consists of a printer controller ASIC (IC1:Hurricane), printer controller CPU bus connection ASIC(With control PWB), and analog
ASIC(IC3: Thunderbolt) with a built-in motor driver and head voltage generating circuit.
1) Hurricane(IC1): (RH-IX2314XHZZ)
This is ASIC where CPU(ARM7) of 32-bit RISC works as its core and peripheral features are integrated. It is also equipped with the firmware ROM,
buffer ROM, and IEEE1284 parallel port interface. Data communication with the main controller is performed via Alcore ASIC. Data from Alcore ASIC is
transferred to the controller in the compatible mode or ECP mode of IEEE1284, and the controller sends the status of the printer in the nibble mode. The
operating frequency is 24 MHz.
2) Thunderbolt(IC3): pin-44 PLCC(VHIPC901054-1)
Motor drivers of the FD and CR motors, and head voltage(11.82V) generating regulator of the printer carriage are integrated into this analog ASIC.
Each motor control register is set by the one-way synchronous serial transfer via the printer controller, Hurricane.
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