JPS57187724A - Controller for copying machine - Google Patents

Controller for copying machine

Info

Publication number
JPS57187724A
JPS57187724A JP56071371A JP7137181A JPS57187724A JP S57187724 A JPS57187724 A JP S57187724A JP 56071371 A JP56071371 A JP 56071371A JP 7137181 A JP7137181 A JP 7137181A JP S57187724 A JPS57187724 A JP S57187724A
Authority
JP
Japan
Prior art keywords
battery
voltage
input terminal
output
necessary operating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56071371A
Other languages
Japanese (ja)
Inventor
Nachio Seko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP56071371A priority Critical patent/JPS57187724A/en
Publication of JPS57187724A publication Critical patent/JPS57187724A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/28—Supervision thereof, e.g. detecting power-supply failure by out of limits supervision

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
  • Power Sources (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

PURPOSE:To prevent an accident such that the contents (data) being stored in an RAM disappear, by invariably monitoring the output voltage of a power source for RAM backup. CONSTITUTION:The negative input terminal of a comparing element (comparator) 26 is connected to a battery 20 through a relay contact 24A. To the positive input terminal, on the other hand, a resistance 27 and a Zener diode 28 are connected to set a necessary operating voltage nearly equal to an irreducible necessary voltage for the data holding of an RAM6, and the output side of the comparing element 26 is connected to the interface circuit 8 of a controller 2. Since a necessary operating voltage VREF is applied to the positive input terminal of the element 26, an output voltage VB is compared with the necessary operating voltage VREF. When the output voltage VB is lower than the voltage VREF, a battery voltage drop is displayed on a battery voltage drop display device 17 by the output signal of the element 26 and a relay 24 is turned off to charge the battery 20. Then, the display is disappeared when the battery 20 is charged sufficiently.
JP56071371A 1981-05-14 1981-05-14 Controller for copying machine Pending JPS57187724A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56071371A JPS57187724A (en) 1981-05-14 1981-05-14 Controller for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56071371A JPS57187724A (en) 1981-05-14 1981-05-14 Controller for copying machine

Publications (1)

Publication Number Publication Date
JPS57187724A true JPS57187724A (en) 1982-11-18

Family

ID=13458569

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56071371A Pending JPS57187724A (en) 1981-05-14 1981-05-14 Controller for copying machine

Country Status (1)

Country Link
JP (1) JPS57187724A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6097495A (en) * 1983-11-01 1985-05-31 富士ゼロックス株式会社 Copy fee counter for electronic copying machine
JPH01228040A (en) * 1988-03-08 1989-09-12 Fujitsu Ltd Back-up condition display device for memory

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6097495A (en) * 1983-11-01 1985-05-31 富士ゼロックス株式会社 Copy fee counter for electronic copying machine
JPH01228040A (en) * 1988-03-08 1989-09-12 Fujitsu Ltd Back-up condition display device for memory

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