Leica Pradolux RT-300 wiring/repair help

[bhutchis]

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Hi,

 

I recently took apart my slide projector-a Pradolux RT 300 in order to service it (mostly just cleaning gummed up gears).

 

However, I forgot to take note of the wiring before disconnecting the headers for one of the circuit boards. I am wondering if anyone knows where to find a service manual, or if perhaps someone who has this model of projector wouldn't mind opening it up and posting a picture? (There are 2 screws on the lateral sides, 2 on the bottom front, and one in the back that allow the bottom panel to lift out when removed)

 

 

Any help would be greatly appreciated.

 

best,

 

b

[argusmike]

BH, Did you ever get it together? I was just given one and am at the same point, but everything is still assembled so I could make a photo. Regards, Mike Reitsma

[bhutchis]

Mike, I would be very grateful for a photo (or as many as you care to take--it's the wiring order I need help with), my projector is still disassembled and wiring yet to be figured out.  

 

thanks,

 

bh

[ken2116]

I also need to service my RT300 whose slide changing mechanism gradually slowed and most likely is gummed up.  Can you tell me how to disassemble it?  Is a service manual available - I've removed all of the screws I can find but there must be one or more hidden as it won't quite come apart.  Also,  can you recommend solutions or solvents to use and those to be avoided?  Any parts of the mechanism that I should avoid disassembling, such as optical path or autofocus elements that require precision alignment?  Okay to direct this to a new post.

[bhutchis]

Hello Ken2116,

Would you be able to take any pictures of the PCB board and cables connecting to it? I didn't do so when I took mine apart, and cannot get it back together correctly. If I can get the correct wires/coloring for the pins, I'll be able to service the damage I caused to my board when I reconnected the wires incorrectly. 

I don't have specific recommendations for solvents, I would assume a light kind of oil, but I imagine someone might have some better suggestions. It seems to make sense to me to clean off the previous lubricant that has begun to break down/get saturated with particulates. I don't recall if I used something more benign like rubbing alcohol, or if I used something potent like acetone, or if I didn't use solvents at all and just ran the machine till it had warmed sufficiently to wipe off the old lubricant. I wouldn't recommend anything stronger than acetone. For a lubricant, I think I used sewing machine oil. My idea was to apply something light without a cleaner--as I understand, CLP will "clean, lubricate, and protect" but then can clog up later with all the newly free particulates it dissolved when applied). Bear in mind, I am not a professional service-man, so if others have better suggestions I'd be happy to hear them. 

I'm probably more gung-ho about taking things apart that probably shouldn't, as to parts you should avoid disassembling, I don't know. I haven't been able to check the results of my cleaning since I haven't been able to correctly connect my cables to the PCB board. I don't have any service manual, unfortunately. I do recall one or two screws that were harder to find, I'll have a look and see what I can find. 

[AlanD]

I just got one which is working but doesn’t reverse properly (it just goes forward)

without breaking it further, which screws do I need to remove to expose the PCB to see the wiring?