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Clean the battery cap and contacts with a pencil eraser including the cap threads.
there are no new parts available for this model Pentax, so a good used part repair could be expensive.
An inexpensive hand held light meter might be the way to go if the cleaning did not work, and the camera is otherwise working good.
clean the battery cover and contact with a pencil eraser making sure the cap threads are also clean.
this is a fairly expensive repair if the meter or circuit board needs replacing ( no new parts are available ).
if the meter still does not work, and the K1000 is in good working order buy a inexpensive hand held light meter.
The Pentax MV has a similar body and uses the same lenses as the Pentax ME Super, but it is a fully "Auto Exposure" camera. It does not have manual override or shutter-priority modes. It is a good camera to take pictures, but not if you want to have full manual / creative control over the camera.
Easy solution : remove battery cover and clean inside the battery chamber AND the battery cap/cover itself ( use pencil erasor or anything slightly abrasive ) More demanding solution : remove top cover and locate red wire on the left hand side of the circuit board ( impossible to miss; the wire brings power from battery chamber to the main board ) and resolder ( dry joint ) . You should also actually measure whether you are getting 3V through this wire ( one connection to the contact and the other to the body of the camera ). If you are still not getting anything out from the battery chamber the red wire needs replacing.
Clean the contacts in the battery chamber
to get to the bottom of the chamber use an eraser on the end of a pencil
Also the top contacts. you could also try packing out the contacts on the tops of the batteries to ensure good contact.
Possibly losing battery contact
Clean the contacts -take betts out clean the ones in the base[inside] of the chamber with an eraser on the end of pencil.
Polish up the lid contact.
Reinsert batts- and try.
If it goes off try pressing home the lid - does it stay on?
pack out the lit with a small piece of foil.
Still in trouble?
Contact Pentax technical Support- in case this is an issue.
A repair is not likely to be cost effective however.
Do not interfere with the lens as it is out -dont try to push it back- this will wreck it.
Take the batteries out and with the eraser at the end of a pencil polish the contacts at the bottom the the battery chamber.
Do the same with the contacts in the lid
Try a further new set of batteries.
Insert them. close the lid
Then switch on again and this time gently push ther battery compartment lid.