Saunders/LPL 4x5 Enlarger: Power Supply
(Was also posted to the LargeFormat website.)
To those who own the Saunders/LPL enlarger -- and -- to the great electrical engineers of the world who happen to be photographers.
I own a Saunders/LPL 4500II 4x5 enlarger from before OmegaSatter took over the line.
I just purchased a new power supply from B&H http://www.bhphotovideo.com/bnh/cont...u=90222&is=REG.
Note that the picture on the website is not accurate - the power supply being shipped is different - OmegaSatter is now shipping the original power supply developed by LPL (part #200400). Unfortunately the new power supply is not compatible with my old power supply. The 4-prong connection on the cable that runs from the enlarger to the power supply doesn't fit!
I talked to Customer Service at OmegaSatter and they said that "Saunders bastardized the enlarger by developing a different power supply than designed by LPL." She told me that Hazlow Electronics in N.Y. (585-325-5323) developed the Saunders version of the power supply. She also said that they have had customer complaints about the new power supply not fitting the old-style connection to the enlarger, but do not have a solution. In other words, I am SOL.
So now my questions:
I write software for a living and know little about electronics, but I am hoping I can use the new power supply.
I called and left a message for Larry at Hazlow Electronics and hope he will be able to help. But failing that, I am hoping someone here can help.
Does anyone have a schematic for the old power supply? The cable that plugs into the power supply has 4-pins: but I don't know which pins are for what (options are: fan, lamp, ground).
The new power supply schematic states the following (formatting below is what they show):
So I take this strange formatting to mean that Pin #2 is doing double-duty. It is serving both the Lamp & Fan, and that Pin #4 is ground.
- No.1-2pins to Lamp.
- No.3-2pins to Fan.
- No.4-to Earth
Does anyone know where I can buy the 4-prong connector for the new power supply? (This assumes you know what it looks like -- I don't have a picture of it, but it is a round connection with 4 inputs. How is that for a description?)
Could there be such a thing as an electrical adapter that would fit the old connector & the new connector? (This assumes you know what the old connector & new connector look like. Do I need to do a Google search?)
Has anyone else come across this problem? Do you have a solution?
I bought the power supply as a backup because of the great price ($160 vs $360 or whatever other places are selling it for). Fortunately my old power supply still works! But I'd like to know if I can get the new power supply to work with my enlarger, otherwise I'll return it to B&H.
Potential Solution: Saunders/LPL 4x5 Enlarger Power Supply
For those interested, I have a possible solution posted here:
The number two pin would be a neutral and is common to both the fan and the lamp. The lamp #1 requires a lower voltage then the fan#3 (I believe it to be 82 volt for the lamp and 120 Volt for the fan). The #4 would be be the ground leg and should be continuous to the ground leg at the wall plug in.
Originally Posted by jmedlock
As another poster mentioned, it would probably require only a matching set of four pin connectors (male/female) from Radio Shack to effect the conversion.
The only major consideration is that the transformer in the power supply is of sufficient VA capacity.
FWIW the plug on the "Saunders version" power supply is called a "Jones plug".