CBM-710/720 Service Manual
8
2.
CPU Peripheral Circuits
1)
CPU and ROM/RAM
The CPU M50734SP has a external memory type. Lower 8-bit address is fetched via the A0/D0 bus line by
the 8-bit latch LS373. The 128-KB ROM and 64-KB RAM are used for performing the backup operation for
power failure by the super capacitor. The ceramic oscillator is used as CPU clock and transmits 7.37 MHz.
Fig. 2-1 CPU and ROM/RAM Circuit
2)
Initial Resetting and Power Failure Interrupt Circuit
The IC12 is an IC for generating the power failure interrupt signal and reset signal. When the power supply
voltage decreased due to power failure, etc. this IC performs the voltage inspection and stores all data in the
CPU buffer into RAM while printing.
Содержание CBM-710
Страница 1: ...DOT MATRIX PRINTER MODEL CBM 710 720 Rev 1 00 Newly issued on Mar 1989 Service Manual ...
Страница 3: ...CBM 710 720 Service Manual 1 Chapter 1 Printer Disassebly and Assembly ...
Страница 8: ...CBM 710 720 Service Manual 6 Chapter 2 Circuit Description ...
Страница 19: ...CBM 710 720 Service Manual 17 Fig 8 1 Serial Interface Circuit Diagram ...
Страница 22: ...CBM 710 720 Service Manual 20 Chapter 3 Auto Cutter ...
Страница 29: ...CBM 710 720 Service Manual 27 ...
Страница 30: ...CBM 710 720 Service Manual 28 Chapter 4 Circuit Diagram ...
Страница 31: ...CBM 710 720 Service Manual 29 Fig 4 1 Power Supply Circuit Diagram CBM710 720 001 00 ...
Страница 37: ...CBM 710 720 Service Manual 35 Chapter 5 Parts List ...
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Страница 44: ...CBM 710 720 Service Manual 42 BLOCK DIAGRAM ...
Страница 64: ...CBM 710 720 Service Manual 62 OP Junction Block 5267 07A CORD ASSY CA 5 PC BOARD PC710 06 ...
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