JPS56140568A - Warning circuit for unloading of disk pack - Google Patents

Warning circuit for unloading of disk pack

Info

Publication number
JPS56140568A
JPS56140568A JP4203380A JP4203380A JPS56140568A JP S56140568 A JPS56140568 A JP S56140568A JP 4203380 A JP4203380 A JP 4203380A JP 4203380 A JP4203380 A JP 4203380A JP S56140568 A JPS56140568 A JP S56140568A
Authority
JP
Japan
Prior art keywords
disk pack
lights
unloading
signal
fault
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
JP4203380A
Other languages
Japanese (ja)
Inventor
Kazuo Fujii
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4203380A priority Critical patent/JPS56140568A/en
Publication of JPS56140568A publication Critical patent/JPS56140568A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/038—Centering or locking of a plurality of discs in a single cartridge

Landscapes

  • Control Of Electric Motors In General (AREA)

Abstract

PURPOSE:To prevent the system from breakdown for a long period as a result of unloading of a disk pack by an operator, by providing an alarm lamp which lights when the unloading state of the disk pack is detected and also lights in case of a general device fault. CONSTITUTION:If there are unloaded disk packes or only one disk pack is tightened or insufficiently loaded, contacts (b) and (c) of detection switch 1 are connected together to output a reset signal for FF2. When a motor start signal is generated, NAND circuit 8 receives the motor start signal, reset signal and closk pulse signal of pulse generating circuit 7 and lights alarm lamp 10 via driving circuit 9. In case of a general device is being fault, lamp 10 is lights by a fault signal the device inputted to driving circuit 9 via amplifier 11 regardless of whether the disk pack is loaded or not. Thus, the operator can know the cause of the stop of motor 6 by the light on-off state of alarm lamp 10.
JP4203380A 1980-04-02 1980-04-02 Warning circuit for unloading of disk pack Pending JPS56140568A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4203380A JPS56140568A (en) 1980-04-02 1980-04-02 Warning circuit for unloading of disk pack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4203380A JPS56140568A (en) 1980-04-02 1980-04-02 Warning circuit for unloading of disk pack

Publications (1)

Publication Number Publication Date
JPS56140568A true JPS56140568A (en) 1981-11-02

Family

ID=12624844

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4203380A Pending JPS56140568A (en) 1980-04-02 1980-04-02 Warning circuit for unloading of disk pack

Country Status (1)

Country Link
JP (1) JPS56140568A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689698A (en) * 1983-07-11 1987-08-25 Brother Kogyo Kabushiki Kaisha Disk drive control for inhibiting operation upon battery voltage drop
US4999721A (en) * 1982-12-23 1991-03-12 Canon Kabushiki Kaisha Recording and/or reproducing apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53107369A (en) * 1977-03-01 1978-09-19 Toyota Motor Corp Electronic display type digital clock

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53107369A (en) * 1977-03-01 1978-09-19 Toyota Motor Corp Electronic display type digital clock

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4999721A (en) * 1982-12-23 1991-03-12 Canon Kabushiki Kaisha Recording and/or reproducing apparatus
US4689698A (en) * 1983-07-11 1987-08-25 Brother Kogyo Kabushiki Kaisha Disk drive control for inhibiting operation upon battery voltage drop

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