SYSMEX CA-500 - 3.7 PCB No. 6350 (PRCN-1; Printer Control Board)

3.7 PCB No. 6350 (PRCN-1; Printer Control Board)
PCB No. 6375 (PRCN-3; Printer Control Board)
3.7.1 Specification
The operation of the printer and PCB No. 6350 or PCB No. 6375 are as follows.
1) When the initializing is performed with the paper loading after the power is turned ON, the printer is
ready to operate, turning the READY signal to “L” and waiting for the input data.
2) Data transmitted from the host computer is handshaken by STROBE and READY signals and
stored in the buffer memory in one byte steps. When a full line data (*) is reached, LF(0AH) or
ESC(1BH) code is entered, all data stored in the buffer is printed out. If there is no data before LF
code, only line feed takes place.
(*): When one dot line data is entered, in case of a bit image.
3) Printing is performed in synchronism with the code wheel signal.
4) If the printer head is lifted up with the Head-up lever during operation or when paper empty
condition is encountered, the power to the printer head is shut off and the motor stops. resulting in
the BUSY status. This status is maintained until the above condition is cleared. When cleared,
the status changes to READY.
5) When the buffer contains no print data, the FEED signal is effective. “L” level of the FEED signal
shows BUSY status, providing the paper feed by one line (9 dot lines).
6) If the motor is locked by paper jamming or other reason, the printer will activate the ERROR signal
and makes an emergency stop.
3.7.2 Block Diagram
Most Significant Address
8 bit data
Data 8 bit
Address
Latch
Centronics type Interface
Power Supply Unit
CLOCK
clock
LATCH
DATA
Motor
Driver
Time
Monitor to
cut off
the power
Printer Head
Paper Empty
Sensor
Head Up Switch
Latch
Reset
Stepper
Motor
Phase A, B
PCB No. 6349
Figure 3-10: PCB No. 6350 and 6375Block Diagram
CA-500 Series S/M 3-15 Revised December 2001 8