Sabre Θ∆ 

Poking around on a #repair of a very inexpensive Canon EOS 5 QD (film, equivalent to the Canon A2)

It runs very hot and drained a new battery in minutes; the flash capacitors test at a normal capacitance for the listed values, but this board (Canon part 1550 - DC/DC assembly) smells funky. Anyone know what the component 254 Yd- is? Position label on the board is PG.

The flash caps test normal, and we have spares for those anyway. The battery has shown at a normal level on other cameras which take the same type (Pentax SF7) so whatever is faulty on this board is causing the battery to discharge hard, with gradual recovery afterward.

If anyone knows anything which might help, please let me know <3

#camerarepair #filmPhotography #35mm #CanonCamera #camera

Mar 23 at 2:43amWeb
Show threadPurple Skies2d ago

@sabremc i work with a camera nutjob, ill ask him tomorrow.

id use the word enthusiast, but nutjob would be more accurate.

Show threadSabre Θ∆ 2d ago
@Leviamicky thank you <3
Show threadPurple Skies1d ago
@sabremc camera nerd coworker largely agrees with what other commenters are saying, blaming the caps or the thing charging them. says probs what he would do is get a broken camera with the same component being sold for parts (at a swap/on ebay) and replace the whole board.
Show threadHarper, Michael2d ago
@sabremc I've never owned the EOS 5 QD, so please ignore if this isn't helpful, but it sort of looks like a piezo? Maybe used for making beeping sounds?
Show threadbambinod2d ago
@sabremc it's using a boost circuit to charge the caps. Probably some surface mount parts on the other side of the board. Smell is from a crispy diode, transistor, or mosfet, probably will be visibly damaged from overheating.
Show threadBob Beaker1d ago

@sabremc That looks like an inductor to me, I think the board label is actually L2 at the lower right edge of the component as we are looking at it.

Since all the components on this side of the board are passives it might be useful to look at the reverse side where there might be some surface mount actives?

Show threadMarty B4h ago
@sabremc There used to be a Canon approved repair shop called Sun Camera in North York, Ontario, Canada. I had my old FTb and AE-1 cameras fixed there. I still have the cameras and we are talking late 1990s when I last dealt with them, but FWIW there you go. They did great work!