Recent content by Nimbus62

Sponge, since 45 years!

to loosen tight fitting screws, I check that there is no varnish. Disolv it with gasoline C (or Zippo). I hit the head of the screw with a flat pin punch. Knock permit to loosen the screw threads Use a watchmaker's hammer. Build appropriate pin and requires supporting the opposite part to...

100 problem to solv 😉

I always remove existing solder and replace it with new one. On old camera I use leaded solder. I use different temperature depending location: from 260°C (small cable, flex circuits) to 310°C and different tips depending the type of solder to do. For unleaded solder I use dedicated tips at...

Here before, I try to explain the two approach. For sure refere to the maintenance and service manual of your body to have the precise implementation. Could be different especially because at this pediod the manufacturer were very creative and did a lot of evolution/change. Here the pdf version...

PART 3 Digital implementation WARNING: This is an example of implementation and not a copy of a precise camera. In the digital shutter control, the timer stage is digital with a Counter and a Clock. At the Init, we load a delay value in a digital counter. At start we decrement the counter at...

PART 2 Analog shutter control: How it works. Fig 2 - Block diagram Analog The analog timer stage input and output: input parameter: - speed signal ex from 1/2000 to 8s... control input: - init (to initialize the circuit) - start (synchronous to first curtain start, start the...

PART 1 It was the early 1970s, and 35mm camera manufacturers were introducing electronic focal-plane shutter control, particularly to enable automatic aperture priority, simplify the speed control mechanism and simplify adjustment. (Example: Minolta XM, XE-1, Leica R3, Cannon F1, Minolta XD...

Hi, just come back from small trip. Tablett failure and no internet connectivity... From my point of view, the main problem with lake of Repair report with Electronic SLR is, first, the lake of manufacturer documentation and tools. Second: many time the tools where proprietary and where...

I take a look to X700 presentation. It gives me some idea to explain analog versus digital film camera. Now I go the beach for a walk. I will publish beginning of next week (have to do some drawing to present in parallel analog and digital film camera.

Hi Andreas, no problem I will draft it "simply". I will open a new topic for that.

With a voltmeter, it is easy to test the charg value of C1, it is near 600mV and 700mV for EV9 (1/30 f5,6 100ASA) If it is 0 or very low you obtain very long exposure time, the meter indicate long speed. If it is +2,5 the meter indicate >1/1000. It appends when circuuit is open at pin 9 of...

The circuit is not complex. It is very simple: They use 2 current generaotr (to obtain stable performance, idependently from battery voltage) the current travel trought the cells (one or two bridge according Spot or M The output of the bridge Uev (go to meter through pin 6) and charge C1...

Except possible error, looking at your picture, this is not C1 but the Th component in parallele with R4. C1 is connected with to wire near pin 1 and 2 of the IC.

About the spot/average selection: is the switch correctly connected to the knobe? is the travell of the switch OK? About the 1/1000 in Auto : when displat 1/1000 the requested speed is too high ? or it is another problem?