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Minolta Maxxum/Dynax 7 aperture problem common?

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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Topic: Minolta Maxxum/Dynax 7 aperture problem common?
    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;
http://www.flickr.com/photos/neilt3/
C & C welcome.
 



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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 .
see my photostream on flickr;
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C & C welcome.
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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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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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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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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2021 at 14:32
@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.
 



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Post Options Post Options   Quote rmd Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2021 at 11:55
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

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Post Options Post Options   Quote enricobak Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2021 at 22:25
Hi, if the mentioned problem looks like this I have no good news for you.
Take a look at the lens mount. The aperture arm has probably gone slightly out of wack mounting or unmounting a lens. Gently move back the aperture arm and you might be able to turn on the camera. But you'll be able to took photos only when you set the aperture at max open. Any other aperture setting will end in the same error. I also have a Minolta Dynax 7 (European model of the Alpha / Maxxum 7) purchased as a stock fund (NEVER OPENED NOR USED) and after less than a year of use (having always treated it with the greatest possible care) I encountered the same problem. I'm looking for someone who can fix the problem but haven't had much luck. Unfortunately it is a very common problem :(
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Post Options Post Options   Quote baybora Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2021 at 01:06
My "no display" and "wheezing" upon power-on problems continue. I erased the terminals and the battery terminals, the camera is in such a mint condition, there are no signs of any use even...took the lens out, put new batteries in and powered it on again...same problem.

So frustrating. I am supposed to get the VC-7 grip in the mail today/tomorrow. I will try with that as well.

In the meantime, any ideas are welcome.

Thanks.
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Post Options Post Options   Quote baybora Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2021 at 01:21
Thank you for replying.
I get nothing on the display. I took the batteries out and back in again, but didn't help. I wonder if there is a factory reset sequence.
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Post Options Post Options   Quote AudioDoc Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2021 at 00:41
It has been quite a while since I've dealt with a Minolta 7 problem.
As I recall, with the aperture motor problem, you will get an error on the display before that you hear a motor running briefly. What you describe sounds like a different problem. So its not turning on and you can't access menus? I wonder if it needs to be reset? Remove the battery and make sure the terminals are clean and not corroded and reinsert the battery. If you can get it to power up, maybe go through all the settings and if possible reset them to default.
Of course there are many possibilities as to what is happening and I can only make a guess.

Regards,

Kelly
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Post Options Post Options   Quote baybora Quote  Post ReplyReply Direct Link To This Post Posted: 15 February 2021 at 22:08
Originally posted by AudioDoc AudioDoc wrote:

Originally posted by petesidewalk petesidewalk wrote:


Belated happy birthday to AudioDoc, a wise and appreciated fellow!

Greg


Thank you, Greg!

Neil, with the Minolta 7, there is a separate motor with gears that drive the lens's aperture blades. When something fails, either with the motor, gears or drive circuit the camera will display "error" and won't operate. I've never had one disassembled (perhaps someone else here has) but I would guess the plastic gear press fit to the motor, cracks, as result the motor spins but the gears don't turn. Parts are NLA, and sadly that is probably the case with many older products. Like I say that is a guess based on my experience with other consumer electronic products. I wouldn't worry about it. It can happen, but I still think the percentage of cameras that fail with that problem is low. It probably may happen with other cameras as well, but Minolta sold a lot Maxxum/Dynax/Alpha 7s so there are a lot of them out there.

Kind regards,

Kelly



I just bought a so called "mint" Dynax body from Japan on eBay, and when received it, just out of the box I fell in love with the looks of it. I put fresh batteries, turned it on everything seemed to work. I put a film inside, shot 2 frames and turned it off. Later when I turned it on back, display didn't come on, a wheezing sound and turned off. Turned it back on and off, same response. Film was stuck, due to the lock feature. I was able to take the film out with the procedure from the manual. During this unlocking of the beauty, it made a sound, almost like the mirror lock, or shutter. The same symptom repeated with or without the lens.

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 :)
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Post Options Post Options   Quote SQLGuy Quote  Post ReplyReply Direct Link To This Post Posted: 11 November 2018 at 20:10
I have a Maxxum 9000 with the aperture base problem. Works great except that it only shoots wide open. As far as I can tell, the camera is built around the aperture actuation mechanism. I had started disassembling it, and am currently stuck at trying to get the mirror box out.

Disappointed to hear that 7s suffer from a similar failure. I recently bought a 7, and, so far, it works fine.

If it's a plastic gear issue, that should be solvable, between RC/drone parts and 3D printing, that kind of a part should be sourceable. I have a 1980s pocket PC plotter that had problems with the little plastic gears cracking, and brass ones for RC helicopter applications were a near-direct replacement (just had to broach out the hole a bit).
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 10 November 2018 at 23:20
Fair enough .
I've dismantled a few DSLR's and E mount cameras to convert them to infrared or full spectrum , but I've never opened up a 7d .
Most cameras just have ribbon cables that slot into a socket to connect one board to another , and it's just a case of being methodical and taking pictures as you go .
I'm not sure if the 7d requires some soldering though , which would be beyond me .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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