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01-04-2019, 06:25 PM   #796
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QuoteOriginally posted by madmax Quote
Hi, check youtube there is a guy that dissassambles the sdm drive motor. That may be helpfull. I watched it and It seemed to be too complicated to pay off for a longer usage after repair.
Please link to the video?
I watched many YT videos related to SDM but nobody disassembled SDM itself. They only turn by screw or replace whole unit. I already tried to disassemble it but I cannot turn screws out and get inside it holds sticked together

BTW I got message from KEH service that they are buying SDMs for much cheaper than offers I got but they cannot sell any parts itself to not break some agreement with Pentax.

01-04-2019, 06:52 PM   #797
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QuoteOriginally posted by RayeR Quote
Please link to the video?
I watched many YT videos related to SDM but nobody disassembled SDM itself. They only turn by screw or replace whole unit. I already tried to disassemble it but I cannot turn screws out and get inside it holds sticked together

BTW I got message from KEH service that they are buying SDMs for much cheaper than offers I got but they cannot sell any parts itself to not break some agreement with Pentax.
Maybe they would point you to their source?
01-05-2019, 01:28 AM   #798
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I quickly searched for:


"Pentax SDM repair"

it brings some Videos:

"https://www.youtube.com/watch?v=mr2pfj289a8"

That shows the SDM change procedure. Mybe it is usefull to contact the guy.


"https://www.youtube.com/watch?v=WgAbOIUgKLA"

This DIY. The Guy thinks that often not the Motor inself is broken, that iis Why he only trys to spin the Motor manually to break it lose. U might check and clean the contacts too.
I do not speak dutch but U see what he is doing.

And this Video:
"https://www.youtube.com/watch?v=SZiiG9MaZpY"

It shows how a guy gets the focus working again be tilting it a few times..

I hope that helps

Last edited by madmax; 01-05-2019 at 01:58 AM.
01-06-2019, 12:37 PM   #799
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>madmax
I already seen all this videos (and many more + many nighthours of googling a hints) but nobody there is DISASSEMBLYING THE SDM ITSELF as I had understand (maybe wrongly) from your previous post. I already disassembled my lens and pulled the SDM out but I'm unable to open it. There are 2 screws but sooo tight or the top screw turns around without an effect.
And yes, I contacted DIGI SERVICE from Bulgaria and they can send SDM for 135+15 euro.

KEH and other services probably get parts directly from pentax/ricoh and have some NDA signed to not resell the parts...
But I wonder there are no free SDMs recycled from some damaged lenses (e.g. after a fall on a rock with broken glass but as SDM source would be great).

01-06-2019, 02:06 PM - 1 Like   #800
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QuoteOriginally posted by RayeR Quote
I already disassembled my lens and pulled the SDM out but I'm unable to open it. There are 2 screws but sooo tight or the top screw turns around without an effect.
These two patents may help.

US7839053B2 - One-way rotational transfer mechanism, and ultrasonic rotary drive device incorporating one-way rotational transfer mechanism - Google Patents

US7531942B2 - Ultrasonic rotary drive device - Google Patents

Be aware that one of the screws might be a left hand thread (clockwise to loosen).

I have a slight suspicion that the problem might be in the One-way rotational transfer mechanism which prevents a screw drive from turning the SDM motor, I suspect it locks-up.
Notice the change in the patents between balls and rollers.
01-06-2019, 11:11 PM   #801
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>alfa75ts

Thaks,
It helped a bit to imagine what to expect inside. Today I disassembled it again and also tried to open SDM. There are 2 screws on the axle. One is glued and it seems doesn't screws out. Second is on gear bottom side. After some force where I need tightly and carefully hold the motor body it finally screwed out. The fell off some tiny plastic debris after I removed the gear from axle. I don't know how to disassemble further. See photos

http://rayer.g6.cz/hardware/pentax.k30/da1770b.jpg
http://rayer.g6.cz/hardware/pentax.k30/da1770e.jpg
http://rayer.g6.cz/hardware/pentax.k30/da1770f.jpg

And here is photo of the PCB
http://rayer.g6.cz/hardware/pentax.k30/da1770c.jpg

Please can somebody help to read the blown resistor value (pointed by arrow)? Those who still have this lens and know how to remove top cover.
http://rayer.g6.cz/hardware/pentax.k30/da1770d.jpg
01-13-2019, 02:21 PM   #802
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Just for interest here is total SDM disassembly (destructive, I had to grind off top screw that I couldn't screw out so I crewed it up
http://rayer.g6.cz/hardware/pentax.k30/da1770h.jpg
http://rayer.g6.cz/hardware/pentax.k30/da1770i.jpg
http://rayer.g6.cz/hardware/pentax.k30/da1770j.jpg
http://rayer.g6.cz/hardware/pentax.k30/da1770k.jpg
Now I know how to disassemble it probably without damage. Doesn't matter anyway, nikon motor is on the way so let's see if it will be usefull or just wasted 12$...
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