CBM-710/720 Service Manual
19
10.
Power Circuit
This power circuit supplies DC 5 V for the control circuit and DC 24 V for driving the printer mechanism. When
the POWER switch is turned on, the AC voltage is applied to the transformer T after noise is eliminated by the
capacitors C1 to C4 and noise filter NF. For the secondary voltage of transformer, all waveforms are rectified at
both the DC 5 V side and DC 24 V side. IC1 indicates the regulator IC and Tr1 the current boosting transistor
which can generate DC 24 V constantly. The constant voltage can be obtained by the diode connected to the base
side of Tr3 and Zener diode, while DC 5 V can be obtained by the Darlington-connected transistor Tr2 for current
boost. The diode D5 also serves as temperature compensation.
Fig. 10-1. Power Supply Circuit
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 ...
Страница 40: ...CBM 710 720 Service Manual 38 CBM 710 720 27 2 27 1 26 2 26 1 23 34 24 25 33 ...
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 ...
Страница 67: ...CBM 710 720 Service Manual 65 AC 3 12 3 1 10 4 15 16 10 2 13 2 10 3 10 10 1 11 8 9 17 18 14 21 22 3 6 12 ...
Страница 69: ...CBM 710 720 Service Manual 67 AW 2 10 14 12 13 15 9 1 15 3 6 8 2 2 3 2 1 2 2 7 15 16 11 ...