Re: [Drakelist] AC-3 Ver AC-4
Do you have a small 12 Volt transformer? Hook it up on the two 120 volt AC power plug leads with a 100 ohm resistor on series. That should allow you to do a few voltage measurements w/o blowing the fuse. everything should be 1/10th give or take what the 100ohm resistor drops. Otherwise take a ohm meter and make sure you have at lease some resistance on the primary (across the power plug). Just to make sure that the primary is not connected wrong. It should not have moved, but. easy enough to get the 120/240 sire crossed if you did disconnect them. After that, if you have not found anything, it is time to disconnect all secondaries and see if you still blow fuses. I prefer testing w/o desoldering first if possible. One last thing, look at the caps, make sure they are installed in the correct polarity. 73, Ron WD8SBB --- On Sun, 3/11/12, John Gartman wrote: From: John Gartman Subject: [Drakelist] AC-3 Ver AC-4 To: Drakelist@zerobeat.net Date: Sunday, March 11, 2012, 11:36 AM Well I installed a heath kit in my AC-4 and all mine does is blow the fuse when the jumper is between pins 1 and 2. I have gone over it many times. Wire for wire reds to reds yellows to yellows blues to blues etc. but it blows the 5 amp and a 6.5 amp slow blow and it blows that also. What I don't know is what capacitors to leave on the bottom there are 2 that go to ground. One from the fuse holder and one from L2 Are these needed? I did not assemble the new circuit board I bought it assembled. I know it is hard to guess without seeing and who knows what kind of goof ups a yahoo makes in wiring but anyone have an idea on where to look next ? It did not blow the fuse before the board was installed. Thanks John AG6GL -Inline Attachment Follows- ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] AC-3 Ver AC-4
john, divide and conquer! First thing to do is disconnect the secondary from the transformer to the pcb. Unsolder the wires from the 'red' wires from the transformer to the diodes. then, the 'yellow' wire that goes to the diodes. Finally, disconnect the blue wire that go from the transformer to D7 this separates the transformer from the pcb assemble. Now, check to make sure you don't have one of the loose wire contacting the chassis and when you're happy, plug in the supply and turn it on. (via shorting pins 1 and 2 together) if the fuse holds, then power down and then re-connect just one of the of the sections at a time. If you find that when you, let's say the yellow wires, blow the fuse, then you have a wiring problem on the output side, most likely a short if the fuse blows with the secondaries removed from the pcb, then you have a short someplace in the wiring that you did when connecting the wires from the transformer to the pcb this should help you, mike, wb8vge On Mar 11, 2012, at 11:36 AM, John Gartman wrote: > Well I installed a heath kit in my AC-4 and all mine does is blow the fuse > when the jumper is between pins 1 and 2. I have gone over it many times. > Wire for wire reds to reds yellows to yellows blues to blues etc. but it > blows the 5 amp and a 6.5 amp slow blow and it blows that also. > What I don't know is what capacitors to leave on the bottom there are 2 that > go to ground. One from the fuse holder and one from L2 Are these needed? > I did not assemble the new circuit board I bought it assembled. I know it is > hard to guess without seeing and who knows what kind of goof ups a yahoo makes > in wiring but anyone have an idea on where to look next ? It did not blow > the fuse before the board was installed. > > Thanks > > John AG6GL > > > ___ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] AC-3 Ver AC-4
Well I installed a heath kit in my AC-4 and all mine does is blow the fuse when the jumper is between pins 1 and 2. I have gone over it many times. Wire for wire reds to reds yellows to yellows blues to blues etc. but it blows the 5 amp and a 6.5 amp slow blow and it blows that also. What I don't know is what capacitors to leave on the bottom there are 2 that go to ground. One from the fuse holder and one from L2 Are these needed? I did not assemble the new circuit board I bought it assembled. I know it is hard to guess without seeing and who knows what kind of goof ups a yahoo makes in wiring but anyone have an idea on where to look next ? It did not blow the fuse before the board was installed. Thanks John AG6GL ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
