| 摘要 |
<p>PURPOSE:To eliminate unnecessary power supply and save electric power by performing power-on and power-off control over power unit groups for a main frame through a power source control signal means preferentially to power unit groups for a peripheral device. CONSTITUTION:When power on/off indications to main device power unit groups 1a-1n and peripheral device power unit groups 2a-2n have arrived at the same time, the unit groups 1a-1n are turned on successively from 1a under the sequence control of a main frame shift register 15, and then the unit groups 2a- 2n are all turned on successively in order to put the devices in operation. On the other hand, the main frame side is powered off successively from the unit 1n to the unit 1a. At the same time, the units of the peripheral device side are powered off in the order of 2n-2n-1, and the power is turned off finally for the unit 2a.</p> |
