Apex 460 Power Supply Wire Loose.

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Wordsushi

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Aug 27, 2015
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435
Location
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Help!
I opened up my Apex 460 power supply to replace zeners D5 and D6 and when I lifted the board up, I noticed this yellow wire was not connected, and I don't know where it came disconnected from.  It appears to come from pin 2 of the 7 pin XLR. Does anyone know where this wire is supposed to be connected to?

I can't seem to get my attachments included even with the img tags so here are links to them.

https://www.dropbox.com/s/5kztuvy03wf8jqz/IMG_3199.JPG?dl=0

https://www.dropbox.com/s/5i1rjtjbyznud68/IMG_3200.JPG?dl=0

IMG_3199.JPG


IMG_3200.JPG
 
I've got a schematic of a 460, the pinout of which agrees more closely to the Gearslutz link, than the other one you posted.

Then again, if you've got a multimeter, you should be able to determine what most of the pins do, and by elimination, figure out where the wire came from.
 

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Khron said:
I've got a schematic of a 460, the pinout of which agrees more closely to the Gearslutz link, than the other one you posted.

Then again, if you've got a multimeter, you should be able to determine what most of the pins do, and by elimination, figure out where the wire came from.

I do have one, but I'm not savvy enough to figure that out with a dmm. I think that's the schematic of the mic you posted, not the power supply.

Given the conflicting schematics, at this point, I'm kinda hoping someone with one of these can open theirs up and see for sure where that wire goes.
 
Okay, this is interesting. None of the above PS schematics show a C10 capacitor, but this one does

http://www.vertigesproductions.com/diy/psu-stellar-2.jpg

I noticed a point on the underside of the board that has a blob of solder on it with nothing attached, that appears to go right to the positive side of C10 (see photos).... so my best guess so far is the yellow wire here should go to this point.

Does anyone concur?

https://www.dropbox.com/s/6wkqk7uipov4h6o/IMG_3201.JPG?dl=0

https://www.dropbox.com/s/9fdm21encnmjyi5/IMG_3202.JPG?dl=0
 
I know my schematic's of the mic only, but <hint-hint> the pin numbers of the 7-pin XLR should be the same on both ends of the cable, wouldn't you say? ;)

With the multimeter, pin 1 of the 3-pin XLR is ground, right? If you're careful with the probing, you should be able to easily confirm which one's the heater supply (6.3v or 12.6v), which one's the B+ (120v or so) - that's with the supply on.

With the supply off, with the continuity checker (ie. beeper), the grounds should be easy enough to identify, and so should the capsule bias (for the pattern selection). That's what the lines on schematics mean, y'know - connections ;)
 
Khron said:
I know my schematic's of the mic only, but <hint-hint> the pin numbers of the 7-pin XLR should be the same on both ends of the cable, wouldn't you say? ;)

With the multimeter, pin 1 of the 3-pin XLR is ground, right? If you're careful with the probing, you should be able to easily confirm which one's the heater supply (6.3v or 12.6v), which one's the B+ (120v or so) - that's with the supply on.

With the supply off, with the continuity checker (ie. beeper), the grounds should be easy enough to identify, and so should the capsule bias (for the pattern selection). That's what the lines on schematics mean, y'know - connections ;)


Yeah, I'm too much of a noob to really trust to know what to do with a DMM. It's something I'm working on slowly. Here, I just need some spoon-feeding to get this wire attached. See my above post about the new schematic I found and tell me your assessment. Thanks!
 
If you look on the PCB, there are letters:

G = Green wire
B = Blue wire
W = White wire
R = Red wire (x2)
Y = Yellow wire

Find the 'Y' and connect the yellow wire to that hole.
 

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Banzai said:
If you look on the PCB, there are letters:

G = Green wire
B = Blue wire
W = White wire
R = Red wire (x2)
Y = Yellow wire

Find the 'Y' and connect the yellow wire to that hole.

Thanks Banzai! I was kind of hoping that was what the "Y" was for, but was looking for confirmation before doing anything that would fry it. Much, much thanks!
 
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