JPS5579520A - Malfunction preventive unit of television receiver - Google Patents

Malfunction preventive unit of television receiver

Info

Publication number
JPS5579520A
JPS5579520A JP15390078A JP15390078A JPS5579520A JP S5579520 A JPS5579520 A JP S5579520A JP 15390078 A JP15390078 A JP 15390078A JP 15390078 A JP15390078 A JP 15390078A JP S5579520 A JPS5579520 A JP S5579520A
Authority
JP
Japan
Prior art keywords
aft
pulse
signal
resistances
terminal
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.)
Granted
Application number
JP15390078A
Other languages
Japanese (ja)
Other versions
JPS6049373B2 (en
Inventor
Kazuhiko Kubo
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP53153900A priority Critical patent/JPS6049373B2/en
Publication of JPS5579520A publication Critical patent/JPS5579520A/en
Publication of JPS6049373B2 publication Critical patent/JPS6049373B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Television Receiver Circuits (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE: To realize definite and stable operation even in a weak magnetic field by preventing malfunction of AFT in channel switching operation, by defeating an AFT circuit on detecting a pulse appearing at a video detection output in channel switching operation.
CONSTITUTION: At terminal (A) of IC with VIF amplifier, video detection and AFT circuits built in, a detection output signal appears. This signal is applied to the base of Tr10 by way of resistance 2 and capacitor C7 to develop a voltage of approximate 3V by resistances 5 and 6, and a signal component of not less than 3V is clipped through diode 3. Through the adequate biasing of resistances 8 and 9, a pulse signal which is OFF only in the switching of channels can be obtained at the collector. Defeat operation can be obtained by applying this pulse to terminal (B) of IC1, preventing malfunction of the AFT circuit. In addition definite and stable operation can be secured even in a weak electric field.
COPYRIGHT: (C)1980,JPO&Japio
JP53153900A 1978-12-12 1978-12-12 Malfunction prevention device for television receivers Expired JPS6049373B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53153900A JPS6049373B2 (en) 1978-12-12 1978-12-12 Malfunction prevention device for television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53153900A JPS6049373B2 (en) 1978-12-12 1978-12-12 Malfunction prevention device for television receivers

Publications (2)

Publication Number Publication Date
JPS5579520A true JPS5579520A (en) 1980-06-16
JPS6049373B2 JPS6049373B2 (en) 1985-11-01

Family

ID=15572553

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53153900A Expired JPS6049373B2 (en) 1978-12-12 1978-12-12 Malfunction prevention device for television receivers

Country Status (1)

Country Link
JP (1) JPS6049373B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5911568U (en) * 1982-07-13 1984-01-24 三洋電機株式会社 AFT default circuit
JPS6197275U (en) * 1984-12-01 1986-06-21

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61274189A (en) * 1985-05-27 1986-12-04 Japan Steel Works Ltd:The Valve device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5911568U (en) * 1982-07-13 1984-01-24 三洋電機株式会社 AFT default circuit
JPH039386Y2 (en) * 1982-07-13 1991-03-08
JPS6197275U (en) * 1984-12-01 1986-06-21

Also Published As

Publication number Publication date
JPS6049373B2 (en) 1985-11-01

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