JPS54157025A - Light quantity check and amplifier circuit diagnostic - Google Patents
Light quantity check and amplifier circuit diagnosticInfo
- Publication number
- JPS54157025A JPS54157025A JP6601878A JP6601878A JPS54157025A JP S54157025 A JPS54157025 A JP S54157025A JP 6601878 A JP6601878 A JP 6601878A JP 6601878 A JP6601878 A JP 6601878A JP S54157025 A JPS54157025 A JP S54157025A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- picture signal
- picture
- output
- outputted
- 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
Links
Landscapes
- Facsimiles In General (AREA)
Abstract
PURPOSE: To make a trouble localization possible by utilizing output signals of a picture signal generating photo detector to perform the check for light source deterioration and further diagnosing whether the operation of a picture signal amplifier circuit is good or not on a basis of the output of a false picture signal generation circuit in the picture signal quantizing circuit of a picture signal generation unit.
CONSTITUTION: The light outputted from picture 2 dependently upon the light from light source 1 for picture is read by line measure sensor 3, and read information is converted to electric signals and is applied to picture signal quantizing circuit 20. The output is applied to picture signal amplifier circuit 5 through switching gate 4-1, and picture signals which are converted to a binary and are amplified by circuit 5 are outputted to output terminal 6. Then, these picture signals are applied to light quantity decision circuit 7 to decide the light quantity, and the decision result is outputted to light quantity decision terminal 8. Further, the output of false picture signal generation circuit 9 is applied to amplifier circuit through switching gate 4-2 at a self-diagnosis time of amplifier circuit 5, and the output of circuit 5 is applied to diagnosis decision circuit 10 to decide whether the operation is good or not, and the result is outputted to an amplifier diagnosis decision signal terminal.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6601878A JPS54157025A (en) | 1978-06-01 | 1978-06-01 | Light quantity check and amplifier circuit diagnostic |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6601878A JPS54157025A (en) | 1978-06-01 | 1978-06-01 | Light quantity check and amplifier circuit diagnostic |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54157025A true JPS54157025A (en) | 1979-12-11 |
Family
ID=13303763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6601878A Pending JPS54157025A (en) | 1978-06-01 | 1978-06-01 | Light quantity check and amplifier circuit diagnostic |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54157025A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61281762A (en) * | 1985-06-07 | 1986-12-12 | Hitachi Ltd | Facsimile equipment |
JPS6477269A (en) * | 1987-09-18 | 1989-03-23 | Hitachi Ltd | Light quantity checking method for picture reader |
-
1978
- 1978-06-01 JP JP6601878A patent/JPS54157025A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61281762A (en) * | 1985-06-07 | 1986-12-12 | Hitachi Ltd | Facsimile equipment |
JPS6477269A (en) * | 1987-09-18 | 1989-03-23 | Hitachi Ltd | Light quantity checking method for picture reader |
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