Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-02-2015, 07:28 AM   #16
Loyal Site Supporter




Join Date: Jun 2014
Location: Los Angeles, CA (San Gabriel Valley region)
Photos: Albums
Posts: 205
My K-3 is coming back from Precision Camera, the rep said they replaced 'main circuit' among other things and I was curious where it was relative to the sensor. Googled it and came upon this post. Now I know.

Wow! *THIS* thread is a keeper for generations. Thanks brewmaster15!

07-08-2015, 06:46 PM   #17
Loyal Site Supporter




Join Date: Apr 2008
Location: Upstate NY, USA
Posts: 255
Certainly a very informative set of photos and thank you for posting. I did replace the front cover on a K-x, so I have gone part way through the process. I needed to get it back together, so I was using a wrist strap, etc. to prevent zapping it with static. Just curious if you still have the parts, or if you listed them as a "some assembly required" kit?
07-08-2015, 10:13 PM   #18
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,009
Some geeky notes here.

Parts on main board:
  • The IC with "PENTAX" branding is the PRIME image processor.
  • The two Analog Devices chips are ADCs used when reading out the image sensor.
  • The Spansion chip above the image processor is the flash memory used to store camera settings.
  • The Hynix chip to right of image processor provides 64 MB of DDR2 RAM for the image processor. (Just 64 MB—this is probably why the buffer is so shallow, 5 JPEG/4 RAW @ 3.5 fps.)
  • The round metallic device to the left of the ADCs is likely an SMD supercapacitor used to provide power for the RTC.
Image sensor assembly:
  • The cover of the sensor plate has three rubies, which are used as bearings.
  • The grid of photosites on the sensor acts as a diffraction grating, producing the rainbow pattern. This is essentially the same reason optical discs have a rainbow reflection.
---------- Post added 07-09-15 at 01:31 AM ----------

A few years ago, I fiddled with a much smaller photoflash capacitor rated to 330V on a disposable camera. The charging circuit was powered by a single AA battery and came to a full charge in about 3-5 seconds.

I wired the leads on the capacitor to alligator cables and played around with it a bit. Massive sparks and a loud bang noise (likely a sonic boom as the air expands thermally at a supersonic rate) whenever I touched anything metallic with those leads. Quite a few things were scorched by this device. (I somehow even blew the milliammeter function on my DMM with it.)

Never really shocked myself badly but tried charging the cap to various levels (by letting the battery only make contact for brief periods) and touched the leads to my left leg a few inches apart with voltages up to about 100 VDC as measured on my multimeter At 50 V, it already hurts pretty badly, and I couldn't stand more than about 100 V. Can't imagine what the full 330 V feels like...

—DragonLord

Last edited by bwDraco; 07-09-2015 at 12:31 AM.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
alot, battery, camera, cameras, capacitor, chip, diy, dslr, filter, image, ir, light, pentax, photography, post, processor, sensor, thanks, time
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
FX button mapped to Level LaurenOE Pentax K-3 5 11-14-2013 08:52 AM
How to turn electronic level to manual metering? Newtophotos Pentax K-30 & K-50 3 09-15-2013 08:23 AM
New entry level Fuji with X-trans sensor PBandJ Non-Pentax Cameras: Canon, Nikon, etc. 21 07-01-2013 08:29 PM
Cost breakdown K7 cupic Pentax DSLR Discussion 8 06-25-2009 07:04 AM
Sensor stow on K2000??? boom Pentax DSLR Discussion 4 05-03-2009 07:59 AM



All times are GMT -7. The time now is 08:55 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top