JPS57172516A - Detection system for fault of magnetic head - Google Patents

Detection system for fault of magnetic head

Info

Publication number
JPS57172516A
JPS57172516A JP5764281A JP5764281A JPS57172516A JP S57172516 A JPS57172516 A JP S57172516A JP 5764281 A JP5764281 A JP 5764281A JP 5764281 A JP5764281 A JP 5764281A JP S57172516 A JPS57172516 A JP S57172516A
Authority
JP
Japan
Prior art keywords
output voltage
level
magnetic head
adder
short
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
JP5764281A
Other languages
Japanese (ja)
Inventor
Sunao Nakamura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5764281A priority Critical patent/JPS57172516A/en
Publication of JPS57172516A publication Critical patent/JPS57172516A/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
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions

Abstract

PURPOSE:To eliminate the need for a control circuit for detection by facilitating detection for the short circuit of a magnetic head by providing an adding means. CONSTITUTION:Output voltages V5 and V6 from a writing circuit 10 are inputted to an adder. When a magnetic head (MH) is normal, the output voltage V7 of an adder 11 is lower than a threshold level VT invariably, but if the MH short-circuits, the output voltage is higher than said VT except for a time Tc when a voltage generated on a lead wire drops below the level VT. For this purpose, the output voltage V7 of the adder is passed through a comparator 12 having the level VT, so that the output voltage VS of the comparator 12 stays at a lower level Vs in normal operation. In case of the short circuit of the MH, if a pulse is generated or if the voltage generated at the lead wire does not drops below the VT, the output voltage stays at a higher level Vus. Thus, the short-circuit state of the MH is detected.
JP5764281A 1981-04-16 1981-04-16 Detection system for fault of magnetic head Pending JPS57172516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5764281A JPS57172516A (en) 1981-04-16 1981-04-16 Detection system for fault of magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5764281A JPS57172516A (en) 1981-04-16 1981-04-16 Detection system for fault of magnetic head

Publications (1)

Publication Number Publication Date
JPS57172516A true JPS57172516A (en) 1982-10-23

Family

ID=13061539

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5764281A Pending JPS57172516A (en) 1981-04-16 1981-04-16 Detection system for fault of magnetic head

Country Status (1)

Country Link
JP (1) JPS57172516A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60136910A (en) * 1983-12-26 1985-07-20 Hitachi Ltd Circuit for detecting disconnection fault of magnetic head
US5434717A (en) * 1993-03-19 1995-07-18 Hitachi, Ltd. Read and/or write integrated circuit having an operation timing adjusting circuit and constant current elements

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60136910A (en) * 1983-12-26 1985-07-20 Hitachi Ltd Circuit for detecting disconnection fault of magnetic head
JPH0572646B2 (en) * 1983-12-26 1993-10-12 Hitachi Ltd
US5434717A (en) * 1993-03-19 1995-07-18 Hitachi, Ltd. Read and/or write integrated circuit having an operation timing adjusting circuit and constant current elements

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