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Guest
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 Posted: Tue Oct 20, 2015 8:07 pm Post subject: |
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| All these were measured off the CN2 on the SMPS board. |
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Guest
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| Posted: Tue Oct 20, 2015 8:16 pm Post subject: |
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| All these were measured off the CN2 on the SMPS board. |
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jts1957
Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away
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| Posted: Tue Oct 20, 2015 8:44 pm Post subject: |
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| Anonymous wrote: |
With D31 disconnected and everything else connected it will give me
Pin 1 will read 12V ? 0V at CN2 presumably.
Pin 7 will read 34.7v
Pin 8 will read 34.7v
Pin 9 will read 34.7v
This is only for a short time until the unit displays protect and shuts off again. |
Ok, let's try this: What RESISTANCE readings do you get on U31 Vin & Vout pins?
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Guest
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| Posted: Wed Oct 21, 2015 5:58 am Post subject: |
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Ok
So the resistance of the U31 Vin and Vout with everything connected I get 0hms.
With the Amp pcb unplugged I get 4.03Kohms.
Just in reference to your last post there I get 0 volts off #1 of J3
and 0 volts pin #9 of CN2 at the SMPS.
There is -12v at pin ( this is with black lead in pin 9 on cn2 and red in pin 7 of cn2) Not sure if this is how I was supposed to read that one. |
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larserik
Joined: 19 Oct 2015
Posts: 20
Location: Australia, QLD
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| Posted: Thu Oct 22, 2015 9:05 pm Post subject: |
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Do you have any other things I can try?
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jts1957
Joined: 24 Nov 2008
Posts: 2476
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| Posted: Thu Oct 22, 2015 9:32 pm Post subject: |
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Check your PMs. (just to the left of Login/Out)
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larserik
Joined: 19 Oct 2015
Posts: 20
Location: Australia, QLD
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| Posted: Thu Oct 22, 2015 10:18 pm Post subject: |
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Thanks got your Pm I will try that tonight, I can't reply to pm's until I have 20 posts.
Thanks again for your time, Its very appreciated.
With all these points I'm Just measuring volts with the unit powered up?
Just let me know when you have had enough of me I will understand.
C92 = +?
C41 = -?
C1 = +?
C81 = +?
C11 = -?
C31 = +?
C51 = +?
C71 = +?
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jts1957
Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away
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| Posted: Thu Oct 22, 2015 11:10 pm Post subject: |
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Do ALL the power supplies fire up with ONLY CN2 unplugged?
| larserik wrote: |
| With all these points I'm Just measuring volts with the unit powered up? |
Measuring between the points indicated (red meter lead) and any convenient point connected to GND (black meter lead).
I think you'll find that any 'Standby mode' voltages will also be present in 'run/switched mode' ('Standby' = unit plugged into mains)('run/switched' = unit plugged into mains and the power button has been pressed).
You could make two columns: SB and Run and measure each point twice. Once in SB mode and then again in Run Mode.
Coming onto forum without logging in doesn't help increase your post count.
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larserik
Joined: 19 Oct 2015
Posts: 20
Location: Australia, QLD
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| Posted: Thu Oct 22, 2015 11:19 pm Post subject: |
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Ok thanks that makes it very easy to understand 
Yeah I'm not sure what happened on those other posts I thought I was logged in.
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larserik
Joined: 19 Oct 2015
Posts: 20
Location: Australia, QLD
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| Posted: Fri Oct 23, 2015 6:08 am Post subject: |
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Were gonna try to keep this simple. With the unit fully reconnected, with all known bad parts replaced (supposedly with 'correct' replacement parts), you have repeatedly indicated that with ALL connected normally, the unit will NOT fire up. I'm trying to get a handle on which supply(ies) that connect to the amplifier board via CN2 are involved.
Do ALL the power supplies fire up with ONLY CN2 unplugged?
If your answer to this is 'NO,' then ALL question marks will be replaced with '0.' If your answer to this is 'YES,' then ALL question marks will be replaced by numbers. if your answer to this is 'Other,' then question marks will be replaced with a mixture of '0' and numbers.
There are 8 different supplies - 6 positive and 2 negative. I'll give you the capacitor to measure ACROSS & even tell you whether to expect a positive or negative reading, so all you have to do is report a zero or a number in place of the question mark.
I put a new diode in D31 and everything connected.
I unscrewed the board and tested from the underside? seemed the only way to get to the different parts
The D31 diode started smoking?
standby power was
C92 = +? +250v
C41 = -? +22.2v
C1 = +? +28v
C81 = +? +11.85v
C11 = -? +50v This was not negative
C31 = +? -16 to -30v it was fluctuating
C51 = +? +6.02v
C71 = +? +5.6v
I tested all voltages a few times to confirm results, It would not go to switched/run mode so i couldn't measure those voltages in that mode.
I tried disconnecting the CN2 only and still would not go to switch/run.
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