vanja Posted November 1, 2007 Share Posted November 1, 2007 Hi to all!<br/><br/> Again some trouble with the Rollei 6008 Integral. Namely, the film back is a 6000 series one and I think it is adapted to work with 6008 camera - so the camera can read the ASA setting. At some point, the camera did that nicely, but I had some trouble which "forced" me to poke inside and even thoe I solved the problem, now the camera want read the ASA seteting.<br/><br/> I did measure the resistance from the contacts on the back itself and I can see that the setting on the back does work but I am not sure that the measures are correct. The below table shows all the measuring, the contact number 1 is at the far left as shown on the attached image.<br/><br/> The camera does not respond to ASA setting, but frame forwarding is OK, film loading also and also the detection of film protection slide not fully open.<br/><br/> Unfortunately, I do not have any repair manuals and/or schematics so feel free to show me the way :-) Any pointers appreciated!<br/><br/> Thanks!<br/> Vanja <table width="384" border="1" cellspacing="0" cellpadding="0"> <tr> <th width="52" scope="col">ASA</th> <th width="99" scope="col">Contact 2 & 5</th> <th width="108" scope="col">Contact 2 & 6</th> <th width="115" scope="col">Contact 5 & 6</th> </tr> <tr> <th scope="row" align="right">25</th> <td align="right">2 Ohm</td> <td align="right">6,47 KOhm</td> <td align="right">6,47 KOhm</td> </tr> <tr> <th scope="row" align="right">50</th> <td align="right">0,80 KOhm</td> <td align="right">6,47 KOhm</td> <td align="right">5,66 KOhm</td> </tr> <tr> <th scope="row" align="right">100</th> <td align="right">1,62 KOhm</td> <td align="right">6,47 KOhm</td> <td align="right">4,85 KOhm</td> </tr> <tr> <th scope="row" align="right">200</th> <td align="right">2,43 KOhm</td> <td align="right">6,47 KOhm</td> <td align="right">4,04 KOhm</td> </tr> <tr> <th scope="row" align="right">400</th> <td align="right">3,23 KOhm</td> <td align="right">6,47 KOhm</td> <td align="right">3,25 KOhm</td> </tr> <tr> <th scope="row" align="right">1600</th> <td align="right">4,85 KOhm</td> <td align="right">6,47 KOhm</td> <td align="right">1,61 KOhm</td> </tr> <tr> <th scope="row" align="right">3200</th> <td align="right">5,66 KOhm</td> <td align="right">6,47 KOhm</td> <td align="right">0,80 KOhm</td> </tr> <tr> <th scope="row" align="right">6400</th> <td align="right">6,47 KOhm</td> <td align="right">6,47 KOhm</td> <td align="right">1,3 Ohm</td> </tr> </table> Link to comment Share on other sites More sharing options...
tinko_czetwertynksi Posted November 2, 2007 Share Posted November 2, 2007 you might want to check the parts (half circle golden) where those contact on the camera.. i have a 6008 pro on which the support for those broke (its very fragile, i wouldnt even touch it) and had to have it repaired. Dont know if that has anything to do with it or not. Link to comment Share on other sites More sharing options...
vanja Posted November 2, 2007 Author Share Posted November 2, 2007 By "half circle golden" you mean those half domes on the body itself? I did a check and contacts seam to be in good order. Link to comment Share on other sites More sharing options...
User_3607948 Posted November 2, 2007 Share Posted November 2, 2007 Vanja, Only speculation on my part but I could tell you a wonderful story involving digital VOM vs conventional VOM (high vs low input impedance) In summary: micro current devices require impeccable connections. Link to comment Share on other sites More sharing options...
john_banister1 Posted November 3, 2007 Share Posted November 3, 2007 I took some measurements for comparison. I have a feeling your back is ok. Measured with a Fluke model 112 multimeter. It measured 0.2 - 0.3 ohms when the leads were touching one another. 120 magazine s/n 501620089 2 & 5 2 & 6 5 & 6 25 2.5 4.77k 4.77k 50 0.60k 4.77k 4.17k 100 1.20k 4.77k 3.57k 200 1.79k 4.77k 2.98k 400 2.38k 4.76k 2.39k 800 2.97k 4.76k 1.79k 1600 3.56k 4.76k 1.20k 3200 4.16k 4.76k 0.60k 6400 4.76k 4.76k 1.9 120 magazine s/n 704520005 2 & 5 2 & 6 5 & 6 25 1.9 6.53k 6.54k 50 0.82k 6.54k 5.73k 100 1.64k 6.54k 4.90k 200 2.46k 6.54k 4.08k 400 3.27k 6.54k 3.26k 800 4.09k 6.54k 2.45k 1600 4.90k 6.54k 1.63k 3200 5.73k 6.54k 0.82k 6400 6.54k 6.54k 1.2 220 magazine s/n 504530004 2 & 5 2 & 6 5 & 6 25 2.1 6.48k 6.48k 50 0.81k 6.48k 5.67k 100 1.62k 6.48k 4.85k 200 2.43k 6.48k 4.05k 400 3.24k 6.48k 3.24k 800 4.05k 6.48k 2.43k 1600 4.85k 6.48k 1.62k 3200 5.67k 6.48k 0.81k 6400 6.48k 6.48k 1.2 Link to comment Share on other sites More sharing options...
pete_kiefer Posted November 3, 2007 Share Posted November 3, 2007 Pins 2&6 on the camera see 6.4 Ohms Pins 2&5 see ascending values ~doubling Pins 5&6 see descending valued ~ halving The ISO (ASA) dial seems to be a simple logarithmic pot with click stops.<div></div> Link to comment Share on other sites More sharing options...
pete_kiefer Posted November 3, 2007 Share Posted November 3, 2007 What I forgot to say: I think the ISO pot forms a voltage divider. In the cameras processor an input port reads the varing voltage created by applying a constanct voltage to pins 2 & 6 and reading pin 5. The potential difference between 5 (the center pin) and 2/6 is read as a film speed number that is most likely identical to the output of the compensation dial on the body. An Analog to Digital converter outputs a binary number that the processor understands as a film speed value when coming from the film mag and as a compensation factor when coming from the body's dial. Link to comment Share on other sites More sharing options...
vanja Posted November 4, 2007 Author Share Posted November 4, 2007 I see your idea about voltage divider and it sounds correct (without the schematics to read it is hard to tell, but it seams reasonable).<br/><br/> Anyway, I measured from the body, and the 2&6 pins show 595 Ohms which is quite different from you measures. All other pins have no measures at all and pin 6 is grounded on the camera body. t the same time, the compensation dial works fine. Took some voltage measures too and all the pins show activity - I guess that something in the camera itself is not OK. A shame :-)<br/><br/> I'll probably give it another try, but if you could just check about pin 6 being grounded? Thanks for the input! Link to comment Share on other sites More sharing options...
vanja Posted November 4, 2007 Author Share Posted November 4, 2007 John thanks for the back measures, they do show a bit different values but the change rate seams consistent so I agree that the back is probably OK. Link to comment Share on other sites More sharing options...
User_3607948 Posted November 5, 2007 Share Posted November 5, 2007 Vanja, Sorry I didn't consider this earlier but your posting about cleaning the shutter speed dial (useful post, thanks!) shows the six connections for the film speed from the back. Have you checked that something simple like a solder joint isn't causing the problem? Link to comment Share on other sites More sharing options...
vanja Posted November 6, 2007 Author Share Posted November 6, 2007 Joseph, I resoldered all connections with the back, and in my opinion they are OK. Tried exercising some force to the joint and they seam to hold - the measurements also show that they are correctly connected. I think that I probably short-circuited something non essential and hence the back setting is not visible in the camera. Unfortunately, I don't have another back nor do I have someone who can lend me one for testing, so I'm kind of fishing in the dark... <br/><br/> Nice idea thoe :-)<br/><br/> P.S. Thanks for taking the time to read the shutter speed dial cleaning post, I was beginning to doubt it's usefulness :-) Link to comment Share on other sites More sharing options...
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