John
What are your thoughts on this?should I put new bypass caps in?and should I add more?
AU-X1
- Thread starter Willy6
- Start date
What are your thoughts on this?should I put new bypass caps in?and should I add more?
I'm back to where I started from.On my previous post #563 when I said I turned it on I didn't notice that I had #06 on F2781 unplugged which if you look at the schematic is one of the purple wires from the toroidal transformer that go's through the bridge rectifier and from there to the bank of main caps.Right now the symptoms are the same as before I pulled the main caps on the right side dbt reads short circuit .What doesn't make sense is I was able to turn everything on with the part units bank of caps through a series of jumper wires.I pulled the bridge rectifiers today and they test good the bank of caps are new so I know they are good so now I'm chasing my tale thinking toroidal transformer again?When ever I unplug #06 on F2781 it turns on.
Ronito6
Super Member
Oh...dang it.
Well, you might try swapping the filter cap banks from one side to the other.
It would test to see if your new filter caps are working correctly.
If the symptom occurs again on the same side, the swap the drivers out one side to the other.
If the symptom jumps sides you'll certainly catch the source.
Also make sure you don't have either of the phono buttons engaged. Do all testing and swapping with the auxiliary selection only for now.
Also make sure the amp is switched to integrated.
I suppose keeping speakers switched off would be wise until you've found your issue.
I suspect a mistake on a driver. Maybe a reversed diode?
Well, you might try swapping the filter cap banks from one side to the other.
It would test to see if your new filter caps are working correctly.
If the symptom occurs again on the same side, the swap the drivers out one side to the other.
If the symptom jumps sides you'll certainly catch the source.
Also make sure you don't have either of the phono buttons engaged. Do all testing and swapping with the auxiliary selection only for now.
Also make sure the amp is switched to integrated.
I suppose keeping speakers switched off would be wise until you've found your issue.
I suspect a mistake on a driver. Maybe a reversed diode?
Ok feeling kinda dumb now! I didn't have it set to integrated so now the right side main caps charged up but there's a short somewhere on F2775 I think.
Ronito6
Super Member
Basically, through sheer determination you've accomplished quite a bit to be proud of here.
This is complicated stuff even for the best tech guys out there. I'm sure even they often overlook the obvious more often than they might admit.
This thread is an education for one and all, I'm certain. There is a lot of good new info here.
Thank you Wllly, and keep it coming!
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Will do Ron and thanks for the kind words of encouragement
I started redoing the left side bank of main caps so both sides will be the same and it will make it easy to pull the F2775 boards in and out..
I don't think it's the driver I pulled and checked the right F2775 and I don't see anything wrong so I then went to the extremes of pulling the small square transformer and bench testing it but it is 100v and all the voltages are higher than what the schematic says so I ordered a step down transformer and I'll prabably put everything back to the Japanese version..I'm getting pretty fast at pulling boards and reinstalling them
While I'm waiting for the step down transformer I pulled the left bank of caps out and started the process of gutting and re stuffing them..going back to my regular job day after tomorrow so it's kinda slow going..I don't think it's the driver I pulled and checked the right F2775 and I don't see anything wrong so I then went to the extremes of pulling the small square transformer and bench testing it but it is 100v and all the voltages are higher than what the schematic says so I ordered a step down transformer and I'll prabably put everything back to the Japanese version..I'm getting pretty fast at pulling boards and reinstalling them
Ronito6
Super Member
Worth the wait.
Ronito6
Super Member
Here are Amp8's examples from:
http://amp8.com/sansui/x-xx/x1/au-x1-5.htm
Make it look like this and you'll be good.
I got to double check that SM now and see if it's indeed in error.
http://amp8.com/sansui/x-xx/x1/au-x1-5.htm
Make it look like this and you'll be good.
I got to double check that SM now and see if it's indeed in error.
I have mine in like Amp8's pic but the service manual is opposite..Here are Amp8's examples from:
http://amp8.com/sansui/x-xx/x1/au-x1-5.htm
Make it look like this and you'll be good.
I got to double check that SM now and see if it's indeed in error.
It would be right if you were looking at it from the top view but their diagram shows the bottom view..
