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Post by mastertech on Jan 24, 2016 13:32:31 GMT -5
Are you sure your voltage reading was not millivolt? You can do your testing at a connector if it is easier. Just look at the schematic to see what connector on that board has those voltages on it.
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Post by mastertech on Jan 24, 2016 13:37:54 GMT -5
Just as a side note, were you maybe testing on the input side? The input should be +-26v. The output should be +-15v.
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dsmcasey
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Post by dsmcasey on Jan 24, 2016 14:39:53 GMT -5
Master, I was testing the Q4170 and Q4171 spots on the board. I had the meter on VDC, 200. I'm sure of that. There are two small capacitors there on the board (one at each location) and I tested by attaching a small wire to each side then hooking them to the multimeter.
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Post by mastertech on Jan 24, 2016 15:39:26 GMT -5
What were those caps numbers on the board?
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dsmcasey
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Post by dsmcasey on Jan 24, 2016 15:51:18 GMT -5
Checked connectors on 801B and 9011B and got the correct voltages in Standby and Power on on both connectors. J4564 and J4563 I also tested and pulled 12V on both.
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dsmcasey
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Post by dsmcasey on Jan 24, 2016 16:00:53 GMT -5
Q4170 and Q4171 were the numbers. Perhaps I screwed up by testing voltage with each end of the multimeter touching one of the lead wires I ran instead of testing each side of the small cap individually for voltage and having one lead grounded.
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dsmcasey
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Post by dsmcasey on Jan 24, 2016 17:43:52 GMT -5
Master, I retested the top leg on Q4170 and Q4171. I still get 25 volts. I hooked a lead up to one leg, then other end to ground on my meter. It's steady, but its definitely 25V. Please advise on how to proceed. Thank you!
Edit: Unplugged the main power connector (J6718) and reran amp test and it comes up with all channels bad code (NG: LCRSLSRBLBR). Plugging the main power in gets me the same code as before except L and R ( NG C SLSRBLBR).
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Post by mastertech on Jan 24, 2016 19:14:32 GMT -5
Using words like top leg and such mean nothing to me. I have no reference.
Lets try it this way. Near those same regulators, locate capacitors C4172 and C4173. Solder a test wire to the + side of C4172 and solder another wire to the - side of C4173. Connect the neg probe of your meter to the chassis and leave it there. Then after unit is on, test the wire on C4172+ with your pos probe. Should be +15v. Then test the wire on the - side of C4173 with your pos probe. Should be -15v. Let me know what you get.
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dsmcasey
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Post by dsmcasey on Jan 24, 2016 19:29:13 GMT -5
Master, I think you meant Q4171 and Q4170 (Edit: You may have meant C4171, I believe that is the designation of the small capacitor on that circuit). I still had the lead hooked up from retesting a minute ago. I used my old multimeter just in case something was funky on the new one. On the negative side I get -24.7v on the negative side, and Positive values of roughly the same on the + side. My settings are 200 Volts DC on the multimeter with the probe grounded to the chasis. Edit, I checked Q4171 on the NR545 and I get similar readings (pic is from the 545). What am I doing wrong? I have now used two different multimeters and every method I can think of...Voltage goes down immediately to 1.7 or so then bleeds down slowly after power off.  |
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Post by mastertech on Jan 24, 2016 20:19:09 GMT -5
No, I meant exactly what I said. Look for those 2 capacitors on that board. Or look for empty spaces where those 2 caps may have gone.
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dsmcasey
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Post by dsmcasey on Jan 24, 2016 21:27:12 GMT -5
Master, I get ZERO volts on those two caps. Nada. Standby or power on, no difference - zero.
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dsmcasey
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Post by dsmcasey on Jan 26, 2016 17:53:08 GMT -5
I sold the NR646 on craigslist for more than I paid. I still have the 545 but I am trying to sell it as well. I was hoping this was a case of simple reset or fuse but it appears to be more than that now. I will open a new thread if I decide to continue working on the 545. Thank you for your help Master Tech.
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Post by mastertech on Jan 27, 2016 11:40:59 GMT -5
This was probably your best option.
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