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Dave- you definitely put it in backwards. the blank side should be facing the back of the unit. I noticed that those parts have changed a bit over the years so they don't fit in as neatly as they used to in that spot. You have to bend the leads so it leans back a little bit. kim At 10:04 PM -0800 1/23/01, future perfect wrote: >I ordered the voltage regulator from DigiKey, and put it in, but I am >getting some weird results. Either the display flickers a few times and >turns off completely, or a few LEDs just stay on. This is on a short >power-up after I put in the part- methinks I screwed up somewhere. > >I took #'s u40 & u28, as well as the heatsink out >The new voltage regulator will only fit in one way, with the 'blank PC >board' side facing the front of the unit. >I am guessing "pin 3, on the right when looking at the front of the part" >is >pin3 on the right with the blank side facing me. Let me know if it makes >sense what I did, and please tell me where things went horribly wrong. > >thanks! >Dave Eichenberger- guitars.loops.devices >http://www.hazardfactor.com > > > > >> >> You need to change the two +5V linear regulators at the back of >> the unit to >> a switching regulator. These are 5 volt regulators U40, and U28. When >you >> take the top off the echoplex, they will be the two in the back >> attached to >> the heatsink. These power two 5 volt digital sections. >> >> The part used in current Echoplex production to replace these is the >Power >> Trends (http://www.powertrends.com/) PT5101N 5V switching regulator. You >> should be able to get this part from Digikey (www.digikey.com). This >part >> is a drop-in replacement for the standard 3-pin linear >> regulators, and they >> work great. You can actually use one of these to replace both of >> the linear >> regulators, and it works just fine. This is what they do in >> production now. >> >> You need to take the PCB out of the chassis to do it. To do that, >unscrew >> the front panel, unscrew the pcb, unscrew the heat sink from the back, >and >> remove the nuts from the jacks on the back. It should pop right out. >What >> you want to do is unscrew the regulators from the heatsink. Desolder and >> remove both U28 and U40, the linear regs. Take the heat sink out >> altogether >> since it will be in the way, and you won't need it anymore. >> >> Solder the PT5101 into one of the regulator spots (the left one is a >good >> choice). The PT5101 is pin compatible with the linear regs, so >> there should >> be no trouble with that. Now solder a wire from it's output pin (pin 3, >on >> the right when looking at the front of the part) to the output hole >(pin 3 >> again) for the other regulator location. Use reasonably thick wire, >> probably 18 gauge is ok. This way the PT5101 will be supplying power for >> both the +5V rails the old regulators powered. Put the PCB back in the >> chassis and screw it back together. Now power it up and make sure >> it works! >> You should see the Echoplex runs practically at room temperature now, >and >> hopefully that cures the trouble. >> >> Let me know if you have questions. >> >> kim ______________________________________________________________________ Kim Flint | Looper's Delight kflint@loopers-delight.com | http://www.loopers-delight.com