Originally posted by StigVidar Serial number 618XXXX and repaired once by Pentax and once by me. Pentax filed down the solenoid. I have replaced it with a white one.
You see, even Pentax filed the solenoid and it wouldn't last.
The problem with filing/etching and even drilling a hole into the plunger and filling it with epoxy:
It won't change this very problem linked to "magnetic remanence" and "coercivity"!
This is why even the more advanced methods of modifying the plunger won't last.
There is a balance of how much material you file off so the holding force doesn't get too weak
or filing more off which would counteract with the magnetism but lead to other problems.
Here you can see the work PC35 Photolab does:
Solenoid problem return plus sound - Page 2 - PentaxForums.com
Even with this hefty modification/filing it went wrong again.
One has to study this thread carefully, because other problems later on arrived:
The TO had used butansoldering when unsoldering the modified solenoid by PC35-Lab which of course is a no-go.
All the sudden due to this new problems.
I have tried all sorts of modifications, believe me... and I have the tools to do so.
The main problem arrives if the complex mechanism linked with the solenoid goes out of alignement.
Then one has to disassemble almost the complete camera, about 8 hours including reassembling and adjusting!
I have done it with the K-S2 and the K30 and I don't wish this kind of work on anybody
Nevertheless, $ 50 plus shippingcosts are very cheap and if it lasts for a while, an option!
That I'd prefer the solenoid swap against the Japan solenoid is logical.
Maybe I wouldn't invest this into a K30/50/500 with a very high shuttercount,
but I just purchased a K50 for a friend with low shuttercount and stuck solenoid, it will receive a Japan solenoid
and I am sure it will last for years and years.
Not to forget: With the Japansolenoid those Pentax DSLR's fire that tiny bit faster!
Last edited by photogem; 03-26-2023 at 04:35 AM.