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06-16-2019, 08:24 AM   #1
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Pentax K-x aperture slide knob

The camera works well otherwise, but the aperture knob has become difficult to work with lately.

Short of buying another Pentax APS-C body or taking it to a repair shop, has anyone gone DIY and either fixed/replaced the knob, or tried to clean the contacts with contact cleaner?

I'd really hate to write off my K-x as unusable. Even though I've had it for ten years, the shutter count on mine is barely hovering at 10% of its rated life. I'm not kidding.

Any advice would be appreciated.

06-16-2019, 10:35 AM - 1 Like   #2
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Like you, I also have a K-x that is not what it used to be. AF doesn't always work after changing lenses. Cleaning the lens contacts usually clears up the problem. Worse is the cracked bottom plate at the screw on the corner next to the battery door. For now duct tape holds it together, but I have to repeat the bandage exercise every time I change batteries. Some clown on ebay wants over USD100 for a red bottom cover, which I find a little excessive. I can get a used one for about the same money. Besides, my body is black. I use black duct tape as well.

About the only thing I can think of would be to vigorously rotate the knob back and forth. That might revive it.

Another solution would be contact cleaner. Spraying it into the body might end badly. It would be advisable to at least partially dismantle the camera so that you can aim the spray. Doing that seems easy from looking at internet advice but also not for the faint of heart. Not something that I have attempted.
06-16-2019, 10:54 AM   #3
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Thanks!

I'm fairly confident in disassembling electronics, so I may go with the contact cleaner route. Someone in dpreview also recommended resetting the camera settings and reformatting the SD card. Seems excessive, but I'll give that a spin, too.
06-16-2019, 01:15 PM - 1 Like   #4
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I've sprayed electronic contact cleaner in my older camera without disassembly and it worked fine without any issues. It might not be terribly effective on a weather resistant body without taking the top off. It isn't a huge problem to take the top plate off if you have a JIS screwdriver, but the screws are different sizes and types so you have to keep track.

06-16-2019, 03:10 PM   #5
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Good advice, J1MD. Thanks.
06-17-2019, 09:21 AM - 1 Like   #6
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There are a number of threads on reviving the eDials on various Pentax bodies. Sometimes it is just as simple as an application of contact cleaner. Some have just sprayed it in without opening the body. The K-X is not weather sealed as I recall so this is certainly possible.

Worst case is that the contacts are worn away. Replacement of parts would be the solution. Parts most likely are no longer available.

Search for the many threads on eDial repair.
06-17-2019, 01:13 PM   #7
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I'll look into the eDial posts.

Yep... I'm already looking to grab a second body. My choices so far there are a new KP or K-70... but I'm willing to get a decent used K3-II or something else. I would love a more rugged body this time around.
06-18-2019, 11:00 AM   #8
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For the record, chose a K-70 kit with the 18-135 WR lens. My neighbor is holding the shipment until I arrive home from work later this afternoon.

06-20-2019, 02:52 PM - 1 Like   #9
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You find a good repairmanual in German HERE and another one HERE

Careful: Only use high quality contact cleaner and by no means spray it in just from the outside, you can do further damage because as you can see from the photos you won't reach the inner contacts of the dial without spraying a huge load inside which can do a lot of damage to other parts.

It is best to take the Dial apart and clean it as shown in this German manual with earsticks and something like Isopropyl alcohol.

Have done it a few times with success.
06-20-2019, 03:51 PM   #10
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QuoteOriginally posted by photogem Quote
You find a good repairmanual in German HERE and another one HERE

Careful: Only use high quality contact cleaner and by no means spray it in just from the outside, you can do further damage because as you can see from the photos you won't reach the inner contacts of the dial without spraying a huge load inside which can do a lot of damage to other parts.

It is best to take the Dial apart and clean it as shown in this German manual with earsticks and something like Isopropyl alcohol.

Have done it a few times with success.
Thanks! I'll give it a try soon when I have enough spare time to check. I was careful not to spray too much the first time; nothing else is malfunctioning in the K-x.
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