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Pentax 6x7 TTL Prism Repair

Repairing a broken contact wire and adjusting the exposure meter
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This is the meter on/off switch on the prism
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This is the meter on/off switch on the prism

Pentax6x7TTLPrism

  • Prism top taken off
  • Prism top taken off
  • There are 2 screws hidden behind the front face plate. You must pry off the face plate to remove the screws
  • There are 2 screws hidden behind the front face plate. You must pry off the face plate to remove the screws
  • Looking at the main circuit board
  • The exposure meter needle is actually on the top and is reflected down into the prism viewing area with a very clever set of small mirror like pieces of plastic and glass
  • This is the meter on/off switch on the prism
  • This is the meter on/off switch trigger mechanism up inside the prism cover. I learned you do not need to remove the on/off switch to take the cover off
  • These are the adjusting pots. The largest one on the lower left is VR6 and adjust the overall balance. The others adjust the f stop and aperture limits
  • An overview shot
  • An overview shot
  • The +6 volt wire had broken inside and caused the meter to work sporadically
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