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Minolta Maxxum/Dynax 7 aperture problem common?

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baybora View Drop Down
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Post Options Post Options   Quote baybora Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2021 at 19:01
I am certain of the voltage. I measured the batteries. I even bought Surefire and Panasonic batteries to check different brands, 3v CR123a non-rechargables. The rechargeables I have are higher voltage and the mAh is half of typical Li batts. Soon I will get the grip and test with AA alkalines.

A repair person told me by email that aperture lever and/or rewind motor may be the problem.

If the grip doesn't work either, which I suspect it won't then the beauty is going back..
 



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baybora View Drop Down
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Post Options Post Options   Quote baybora Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2021 at 19:04
Thank you for the link. I will follow up.
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enricobak View Drop Down
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Post Options Post Options   Quote enricobak Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2021 at 19:47
Originally posted by rmd rmd wrote:

An e-mail to this company in Germany might be useful .

Their repair service lists the Dynax 7.

Certainly nothing to lose.

https://www.pego-technik.de/reparatur.html



Thanks, I'll try :)
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2021 at 11:28
Originally posted by Bob J Bob J wrote:

@baybora: are you certain of the voltage in the batteries? I seem to remember talk of the 7 being intolerant of differing voltages that you might see in rechargables.


The disposable batteries for this camera are rated at 3 volt ( typically 3.2 volt if fresh ) .

Rechargeable of this size are available as 3 volt or 3.7 volt ( both a little bit more when freshly charged ) .

As the camera takes two batteries , the correct ones equal around 6.4 volt maximum , the others are up 7.6 volt combined .

Much more than is good for the camera and has reportedly killed them !

So do not put 3.7 volt rechargeable batteries in cameras .
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2021 at 11:35
Originally posted by baybora baybora wrote:


Do any of you think this is the "aperture issue" that many have mentioned? Or do you think the motor drive is out. Any info is appreciated.

I had also ordered a grip. I will try to see if the grip will help..I read in a forum that sometimes it did, most likely due to the more powerful batteries.

Good news is the supplier is cooperating, if nothing works I will return it. However, I am desperately trying to make it work and keep it :)



If the contacts are clean in the battery chamber and the batteries are fresh the camera should work as normal .
( read my above post )

If it doesn't it is faulty .

That's it . Send it back .

If it only works with a grip attached , the camera is faulty . Send it back .
That's all their is to it .

You bought something that is readily available at a fair price that is faulty .
Just send it back and buy one that works correctly .

The only fault with these cameras that can be considered acceptable is the "sticky back" issue that cameras from this era are prone too .
A simple job to clean with a bit of IPA .
see my photostream on flickr;
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mk3018 View Drop Down
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Post Options Post Options   Quote mk3018 Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 15:35
Just $0.35 and some time






Edited by mk3018 - 05 March 2022 at 15:45
 



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enricobak View Drop Down
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Post Options Post Options   Quote enricobak Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 15:41
Yeah, but how can you get to it? It's really difficult to disassembly :(
Please let me know, because I also want to fix mine
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mk3018 View Drop Down
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Post Options Post Options   Quote mk3018 Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 15:57
1.get the metal gear
2.Disassemble the Maxxum/Dynax 7 according to the repair manual
3.repair gear



Edited by mk3018 - 06 March 2022 at 09:19
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enricobak View Drop Down
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Post Options Post Options   Quote enricobak Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 16:01
Thanks, I will let you know as soos as I will be able to try

EDIT: the website is in chinese language and I can't understand, can you please tell me what type of gear should I buy? thank you very much

Edited by enricobak - 05 March 2022 at 16:06
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mk3018 View Drop Down
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Post Options Post Options   Quote mk3018 Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 16:08
Be sure to read the service manual carefully!
There are a few points that need special attention when assembling .
good luck
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Post Options Post Options   Quote enricobak Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 16:15
Thank you, I will
However I'm trying to understand which gear should I buy, because on that website is a little bit tricky for me to understand
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mk3018 View Drop Down
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Post Options Post Options   Quote mk3018 Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 16:17
0.25 module
9 Teeth
0.98mm Shaft diameter(hole diameter)
2.75mm Outer diameter
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Post Options Post Options   Quote enricobak Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 16:18
Bless you
I will let you know (:
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Post Options Post Options   Quote AudioDoc Quote  Post ReplyReply Direct Link To This Post Posted: 05 March 2022 at 17:15
Thanks for confirming what I posted back on page 1 of this thread, MK3018!

As a retired consumer electronics technician with some 45 years experience I saw this same issue in all kinds of equipment -- cracked plastic motor drive gears! Typically, manufactures only supplied entire assemblies (as was the case with Minolta). Occasionally, a manufacturer would supply replacement plastic gears for known issues, but of course these might eventually crack again -- too much stress. Most people don't play CDs, DVDs Blu-ray discs anymore, but if you do, a word to the wise, don't push the door to close. Use the open/close button. Some do use a belt/pulley drive, but a lot use gear drive. Any kind of product that uses little servo drive motors are prone to this kind of problem -- from cameras to model railroad locomotives.

Regards,

Kelly
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