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A700 controlswitch replacement

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Jorgen1 View Drop Down
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Post Options Post Options   Quote Jorgen1 Quote  Post ReplyReply Direct Link To This Post Topic: A700 controlswitch replacement
    Posted: 18 November 2014 at 20:46
Hi folks,

I have experienced the well known controlwheel issue on my A700. I have tried the "compressed air" method but I find that worthless, didnīt help at all on my camera. So I downloaded the service manual and ordered a new controlswitchblock on the internet. This evening I have spent a couple of hours replacing the switches and now my camera works like a charm again. I'm so happy

Here are some photos taken during the process.


Remove the backpanel.


Remove the sidepanel.


Remove the frontpanel.


Remove the topcover.


Inside of topcover.


Controlblock removed.


Keep good control of all screws, make notes of where they belong.


Back on track, 100% functional.



Edited by Jorgen1 - 18 November 2014 at 21:10
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Jonas A-R View Drop Down
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Post Options Post Options   Quote Jonas A-R Quote  Post ReplyReply Direct Link To This Post Posted: 18 November 2014 at 22:03

Very cool. Did you try an electrical contact cleaner?
a9 a6300 21/2.8 Loxia 35/2.8Z 35/1.4Z 50/1.4Z 55/1.8Z 85/1.4GM 90/2.8G 12-24/4G 24-105/4G 70-200/4G 100-400/4-5.6GM 2x TC
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Jorgen1 View Drop Down
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Post Options Post Options   Quote Jorgen1 Quote  Post ReplyReply Direct Link To This Post Posted: 18 November 2014 at 22:27
No, I didn't. I think it 's very hard for the cleaner to reach the eletrical contacts when you only have access via the wheel. I wanted to fix it once and for all and no quick fix.
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Pirate View Drop Down
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Post Options Post Options   Quote Pirate Quote  Post ReplyReply Direct Link To This Post Posted: 18 November 2014 at 22:33
Ahoy!

That's a lot of work.

The control wheel skipping issue is well documented and there's plenty of threads on Dyxum about it. All you needed was either some Eclipse or lens cleaning fluid and job done. It takes 30 seconds and is known to work. You could use electrical contact cleaner, but a fast evaporating fluid works best. It's simply a means to an end in order to remove a build-up of fluff and general dust and debris which then allows the control wheel to make proper contact much like cleaning the lens connectors both on the camera and the lens as they can build up a layer of tarnish over time and case a poor contact thereby causing some annoying function errors.

Just put the nozzle containing the fluid on each side of the control wheel and squeeze a few drops towards the centre and the rotate the control wheel rapidly to and fro until the fluid evaporates. That's it, job done!

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Basil View Drop Down
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Post Options Post Options   Quote Basil Quote  Post ReplyReply Direct Link To This Post Posted: 18 November 2014 at 22:38
But just think of the wonderful pictures we would have missed out on!

Well done.
To see is to enjoy. To see beyond is to rejoice.

A77Mark II; A850; A700; A100; NEX 6; various film bodies and an ever-changing collection of lenses
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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 00:17
I agree, job well done! I replaced my control wheels also, not really that hard (except for putting the screws back to where they came from) if you have the service manual and is a permanent fix unlike trying to clean them with fluids which is only temporary in my experience.

Edited by stiuskr - 19 November 2014 at 00:21
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 CZ24-70G2 KM28-75D So70-200G1 So70-300G So70-400G1| SonyF60 AD200R2
 



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Post Options Post Options   Quote dca1213 Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 01:28
Brave man!
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Jorgen1 View Drop Down
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Post Options Post Options   Quote Jorgen1 Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 15:13
I have now disassembeld the controlwheel completely and I can tell You that the "airblowing method" is just placebo. There is not a chance in the world that the air will reach the electrical contacts. The problem is not dust that can be removed by air. The problem is more likely caused by oxide on the lead lines (is that correct english?)
It's the excercise of the switch while blowing that might help temporarily. Same thing with contact cleaner. I doubt that the cleaner will ever reach all the way to the contacts.

Please have a look a this Youtube clip.



http://youtu.be/qQUAa3isfzA

Edited by Jorgen1 - 19 November 2014 at 18:27
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Post Options Post Options   Quote Aavo Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 16:07
You are brave! Well done
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 17:52
Thanks for posting the YT video. The control wheel and the rotary switch are two separate pieces with the switch being buried in a well with no way to get to the contacts without disassembling the switch itself.
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 CZ24-70G2 KM28-75D So70-200G1 So70-300G So70-400G1| SonyF60 AD200R2
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ratboy View Drop Down
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Post Options Post Options   Quote ratboy Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 18:08
Really cool ! I don't have an A700 nor do I have a control wheel problem but I like the tool you used (i.e. wooden block with labelled holes) to keep control of your screws. Very ingenious.
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Jorgen1 View Drop Down
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Post Options Post Options   Quote Jorgen1 Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 18:29
Thanks ratboy. Very simple but very functional
The numbering refers to the drawings in the manual where the screws are shown
Jorgen
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Bob J View Drop Down
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 18:41
Well done for tackling such a job and many thanks for documenting it so well - this will be useful to lots of people!
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 19 November 2014 at 18:50
Originally posted by Bob J Bob J wrote:

Well done for tackling such a job and many thanks for documenting it so well - this will be useful to lots of people!
+1. Contact cleaner is only a temporary solution to get you out of a bind, but in the end this is the only permanent way to fix the problem and keep your A700 in top condition.
Mind the bandwidth of others, don't link pictures larger then 1024 wide or 960 pix high, see here
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