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Stuck Pentax Spotmatic Battery Cover

Stuck Pentax Spotmatic Battery Cover

Many times, customers would bring in cameras with the battery covers almost welded to the bottom cover from battery corrosion.
If you don’t know why this happens let me explain.
First you need to know the battery cover and bottom cover are made of brass with a brush silver colored plated finish. The battery cover has 2 small holes in the coin slot that are there to vent the gases produced as the battery generates electricity.
The holes in the battery cover are not for a tool or spanner wrench.  The slot in the cover measures 1.89mm wide and a Nickle will fit the slot just fine.

    

Pentax made a tool to remove these battery covers, part# 231K-A35-A.

I tried several methods to remove Spotmatic battery covers when they seemed permanently attached to the bottom cover.
When the tool you are using to remove the battery cover slips out of the slot, the tool rounds the edges of the battery cover. Rounding the edges makes it much more difficult to remove the cover. But the battery cover you have is the only one you have.

What not to try.

  • heating the cover.  There is a metal contact and a plastic insulator in the battery compartment assembly. The compartment assembly is spot welded to the cover.

This worked for many covers.

  1. Household vinegar attacks camera battery corrosion with a vengeance. I would remove the cover from the camera and place it in a glass dish. Pour in enough vinegar to immerse the bottom cover and let it soak for 24 hours. Any bubbles appearing mean the vinegar is reacting to the corrosion.
  2. The same as #1 with the addition of placing the dish in an ultrasonic cleaner for 3 x 30minute cleaning sessions and more additional soaking time.
  3. After thoroughly drying the cover inside and out. I then immersed the cover in an “over-the-counter” corrosion removal product like solution in the Liquid Wrench, PB Blaster, WD40, and other similar products. Sometimes soaking for days or several sessions in the ultrasonic cleaner and soaking again.
  4. If no amount a torque* on a good battery cover will remove it after all of the above… I replaced the cover set with a new or different parts

Lastly, I know I had covers in solutions for weeks to no avail.
Stuck Pentax Spotmatic Battery Cover

If some of you find this interesting. Please comment.

Gray
uscamera.com

I started working on Pentax cameras in the 70’s. Pentax was kind of a hometown company at the time. Their cameras were very popular in the Colorado. Honeywell Corp, in Englewood was the importer at that time. Shared the same building with Rollei of America. Later Rollei closed and Pentax USA was formed and moved to the Inverness Dr business park in Englewood.

Many times, customers would bring in cameras with the battery covers almost welded to the bottom cover from battery corrosion.

1970’s film cameras are popular again?

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About Gray

As a 1979 graduate of National Camera's resident camera repair school, is where I found what I best at and wanted to do for the rest of my working career. After camera repair school, I found my gift was the ability to easily understand complex electro-mechanical photo products. I could take almost any imaging item apart, cameras, lenses, slide/movie projectors plus more, understand how the unit functioned, and repair it. Then, accurately reassemble it into a fully working unit. In 1980, I was employed in Denver as a technician for the largest Colorado camera service center performing repair and service of both in and out of warranty for over 38 brands of photographic equipment, accumulating over 5000 hours of bench time. In 1983, I started Technik Camera as a self-employed contractor and general technician. Within a few years, I employed 4 more technicians, 2 people as support staff, and more. I accumulated another 40,000 hours of bench time as we serviced 110mm, 35mm, medium format film cameras, lenses, flash, enlargers, timers, paper processors, long roll portrait cameras, and more. The challenge of successfully taking anything photographic apart and reassembling it into an accurately working piece... and you could not tell I took it apart, was very satisfying for me. Before 1998, we attended many training seminars hosted by factory trainers from Canon, Fuji, Konica, Mamiya, Minolta, Nikon, Olympus, Pentax, and more. Except for a few products, I have worked on most equipment made and thoroughly enjoyed it. When digital products came to market, I didn’t find the digital service as satisfying as film equipment. So I took the time to develop a website that supported digital/film cameras, lenses, other imaging items with parts and service information. I continued to service my equipment and several customers who maintained large collections. The challenge of successfully taking anything photographic apart and reassembling it into an accurately working piece... and you could not tell I took it apart, was enough for me. I have attended many training seminars hosted by factory trainers from Canon, Fuji, Mamiya, Minolta, Nikon, Olympus, Pentax, and Ricoh. I have special tools and test jigs required for many repairs for Canon, Pentax, Rollei, Rolleiflex, and more. I do not work on studio flash. I don't care much for Alpha, Bronica S2 S2a, some Contaflex, and Kodak leaf shutter reflex mirror cameras plus a few others. I enjoy working on almost everything related to film, though in the last few years my focus is on equipment that will not require parts I don’t have. I am adding to the product service list on the service page. I could not include everything I work on there. Sometimes customers will ask if I can fix their model and I am surprised it wasn’t listed. I was working on photo products long before websites were here and I have not needed to advertise for years. I have plenty of my cameras to maintain as well as many local camera collectors with large collections. So do not hesitate to contact me with a service question about your equipment. I am sure I can take care of any issue you may have with the maintenance or service required with your film cameras, lenses, and more. I was working on photo products long before websites were here and I have not needed to advertise for years. Kindest regards, Gray.

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