Canon 580EXII Service Manual Manual pdf 26 page image
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Canon 580EXII Service Manual

Also see for 580EX - Speedlite II - Hot-shoe clip-on Flash: Instruction manualInstruction manualInstruction manualQuick guideManual

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Contents
  1. Table Of Contents
  2. DEVELOPMENT OBJECTIVES
  3. OVERVIEW
  4. FEATURES
  5. EX's High-end Features Retained
  6. NOMENCLATURE
  7. SPECIFICATIONS
  8. Custom Functions
  9. Front cover ass'y disassembly
Canon 580EXII Service Manual Manual pdf 26 page image
Technical Information. Camera Communications1) X-sync Terminal Circuit(1) When X becomes "L," RQ9 turns on via D106S and R328.(2) When RQ9 turns on, IC107 pin 100 goes "H." and flash firing begins at the leading edgeof "H."(3) When the TEST SW (Test firing button) is pressed, RQ 19 turns on and IC107 pin 117becomes "H."(4) When PC terminal is short-circuited by something like a slave sensor, RQ9 turns on viaD301, C302 and R306 and flash firing begins.(1) (3) (4) → (2)2) STSPC Terminal Circuit (Communications Sync Terminal for Camera and Speedlite)(1) The input of STSPC is input to IC102S pin 25, and is compared with IC102S internalreference voltage (2.6V).(2) If the input voltage of STSPC is less than 2.6V, "L" is output to IC102S pin 13. If it is 2.6Vor more, "H" is output. Communications from the camera to the flash are synchronizedby IC107S pin 16 by these "L" and "H" states.Firing is started by 107S pin 99 at the falling edge of "L".(3) The input of STSPC is input to IC102S pin 25, and is compared with IC102S internalreference voltage (0.3V).(4) If the input voltage of STSPC is less than 0.3V, "L" is output to IC102S pin 14. If it is 0.3Vor more, "H" is output. Firing in the TTL mode is controlled by IC107S pin 53 by these"L" and "H" states.(1) → (2), (3) → (4)3) AVEF Terminal Circuit (Speedlite to Camera Transmission Terminal)(1) AVEF is clock-synchronized to STSPC on the flash to camera communications line tooutput the "L" and "H" states from IC107S pin 15.(2) When "H" is output from IC107S pin 15, it enters IC102S pin 24, and is then output tothe AVEFI terminal via IC102S pin 23. When "L" is output from IC107S pin 15, it entersIC102S pin 24, and is then output to the AVEFI terminal via IC102S pin 23.(1) → (2)
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This manual is suitable for:
580EX - Speedlite II - Hot-shoe clip-on FlashSPEEDLITE 580EX II
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