(Both these tests assume there is no film in the camera and you've put charged/fresh batteries in the holder).



To test the battery mod has worked, we need to test the electronic print timer (if fitted) and the electronic shutter. To test the print timer, open the rear door on the camera and using the red handle lift the rollers. Against the exit flap there's a little square lever in the corner. Press the lever and it activates the print timer. Look on the other side of the camera back and you should see the light illuminated as shown.



To test the shutter, cock the shutter and then cover the 'electric eye' on the lens board with your hand. With your other hand, fire the shutter and hold the shutter release down. You should hear a click. Now remove your hand from the 'electric eye' and point the camera to a light source. You should hear the shutter close. You can now let go of the shutter button.



If there is no second click of the shutter, the shutter is closing as soon as you release it. This is most likely because there is no power reaching it. Check your solder junctions and polarity and then retest.