Looks like a great place for a darkroom! Hopefully no jet exhaust will stir things up. I love my darkroom. In previous homes, I converted half of the lower level, left it open, not ideal. Please continue with updates.
Hope to save a D5500
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Success........ mostly
I got my photo cells, they are not the same, actually a little bigger but still fit in the RGB filter housing. I had to drill new holes in the PCB to mount them, but that was easy. What I did find is that they are too sensitive. With the probe gain turned all the way down I would get a no fan error, not sure why that error relates to over driving the photocells. I measured the photo probe output at the A/D input pin for each color and figure anything over 5 or so volts triggers a no fan error.
I made a mask to reduce the light hitting the cells and can now adjust the gain to be in spec. Offset is also fine.. I can now set filtration for each color and the motors dont run on and on. I have a color analyzer, I will set it up with no filtration and then add equal amounts of CYM and see if it tracks.
The service manual I got also lists the actual part number for the photocels, VTB9414B. So far I have not found any. What I found and am using are VTB8441BH.
What I will end up doing is re-scaling the gain adjustment on the op-amps so I don't have to use the mask I made
So now I will spend some time convincing myself what I dial in is really what I am getting.
I got my photo cells, they are not the same, actually a little bigger but still fit in the RGB filter housing. I had to drill new holes in the PCB to mount them, but that was easy. What I did find is that they are too sensitive. With the probe gain turned all the way down I would get a no fan error, not sure why that error relates to over driving the photocells. I measured the photo probe output at the A/D input pin for each color and figure anything over 5 or so volts triggers a no fan error.
I made a mask to reduce the light hitting the cells and can now adjust the gain to be in spec. Offset is also fine.. I can now set filtration for each color and the motors dont run on and on. I have a color analyzer, I will set it up with no filtration and then add equal amounts of CYM and see if it tracks.
The service manual I got also lists the actual part number for the photocels, VTB9414B. So far I have not found any. What I found and am using are VTB8441BH.
What I will end up doing is re-scaling the gain adjustment on the op-amps so I don't have to use the mask I made
So now I will spend some time convincing myself what I dial in is really what I am getting.
I marvel at your ingenuity, well done! I wish I had the electronics knowledge but I wasn’t born with that gene…
That’s great you got the number for the photocells, I missed that. Nice to see you have it working.
I had the advantage of way more diffusion chambers than I needed. So I did some mixing and matching of the color probes to make a working set of all the sizes.
I had the advantage of way more diffusion chambers than I needed. So I did some mixing and matching of the color probes to make a working set of all the sizes.
I found some photocells that I think will work better. The stock ones are actually quite good. The replacements I have are lose on some tolerances. The new ones I found are in between. They will not fit easily and will take some PCB mods. Basically drill a hole through the PCB and mount them from the rear.
But now that I know the D5500 fundamentally works, I will keep an eye out for other mixing chambers.
But now that I know the D5500 fundamentally works, I will keep an eye out for other mixing chambers.
Not sure if you have or need this datasheet
When I see Vactec it brings back my memories of Beseler 45S delays. I found some of the orignals 20+ years ago. I managed soldering, my 9th grade electronics course paid off.
Thanks, I do have that datasheet. The photocells I have coming now are more similar to the 9413B but still much better than what I have at the moment. The active area is also the same as the original, so may not need the mask I'm using now. So for now I'm not going to mess with the circuit and wait till the new photocells are here.
I got my D5500 enlargers working over 15 years ago. Good news was that parts like new knobs , mixing boxes, carriers, lens boards and even replacement power supply boards were available from Omega. Bad news was that I paid $1200 for my first D5500 in 2001.
Well, I got my enlarger for 25 dollars, but now I just spent a few hundred to finish fixing it up. I'm still waiting for the photocells to see if the probe works better with them, but in the meantime, I bought a refurbished one from KHB along with a front cover and some knobs.
One thing I have noticed, all the mixing boxes I see have the probe screwed on. On my mixing box, the probe snaps in some rails.
While I am waiting for the parts to show, I will go through the power supply.
One thing I have noticed, all the mixing boxes I see have the probe screwed on. On my mixing box, the probe snaps in some rails.
While I am waiting for the parts to show, I will go through the power supply.
If I get a bargain I mentally use that to offset some of my more extravagant purchases. One person's junk is another's treasure
I got my new photodiodes in and installed them. What I learned is that their sensitivity is to low to be useful. I thought about changing the gain in the circuit but decided against.
What else I noticed is that it seems someone replaced the offset pots on my probe, what's in there does not really fit well. The pots seemed really sensitive to adjust, just tapping them changes the setting. I found some 5 turn pots that I will try.
It might all be moot as I have a probe coming, but then what else would I do with my time......... Oh yes, maybe actually go take some photos.
What else I noticed is that it seems someone replaced the offset pots on my probe, what's in there does not really fit well. The pots seemed really sensitive to adjust, just tapping them changes the setting. I found some 5 turn pots that I will try.
It might all be moot as I have a probe coming, but then what else would I do with my time......... Oh yes, maybe actually go take some photos.
Today I played a little more with my color probe. I put the first batch of photodiodes back in. Instead of using the mask I had, I decided to try something else without changing the circuit ( gain ), I stacked two of each RGB filters in the filter holder. That seemed to work really well. I can still adjust the gain without being at either extreme. The time the motors spend hunting seems to be much less. I get 197-198 on the filtration.
I still find the offset adjustment much too sensitive. Will see what it's like with the 5 turn pots.
I also had the control apart. Made copiers of the two ROMs, just in case.....
I expect my parts from KHB to be here late next week, early week after.
My next task is to make some film holders. I 3D printed one that holds 35mm strip, but I think I will change the design a bit.
I still find the offset adjustment much too sensitive. Will see what it's like with the 5 turn pots.
I also had the control apart. Made copiers of the two ROMs, just in case.....
I expect my parts from KHB to be here late next week, early week after.
My next task is to make some film holders. I 3D printed one that holds 35mm strip, but I think I will change the design a bit.
I witnessed some 5500 parts listed on eBay a few days ago. FYI.
@ic-racer
Looking at your probe again, the board looks the same but the component values are different. In my service manual, I notice that the component values in the schematic are different from what's in the parts list. When I bought a probe from KHB, Kevin mentioned the probe was updated to the latest spec. There is an update section in my manual, that at least from that update, the schematic is correct. My probe has the old values on it. From your picture, looks like you are at the latest.
Looking at your probe again, the board looks the same but the component values are different. In my service manual, I notice that the component values in the schematic are different from what's in the parts list. When I bought a probe from KHB, Kevin mentioned the probe was updated to the latest spec. There is an update section in my manual, that at least from that update, the schematic is correct. My probe has the old values on it. From your picture, looks like you are at the latest.
I updated my color probe to the latest spec. Can't say I notice much difference in operation. But it's done. Only deviation is I didn't have a 2.2MOhm resistor, so used a 2MOhm. At that scale, don't expect much impact. Just shifts the gain adjustment a bit.
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