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Old 2nd January 2013, 01:24 PM   #731
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by chiily View Post
TP201 -18.07
TP202 -19.45
TP203 -22.06
TP204 -0.533

TP101 18.06
TP102 19.66
TP103 22.16
TP104 0.552
Did you swap the measurements for TP201 and TP202 (also TP101 and TP102)?
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Old 2nd January 2013, 02:11 PM   #732
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Thanks Guys, Joachim, it wasn't that, it popped within a second of switch on.

FDW, I shall have to draw out parts numbered overlay for the board. I can't follow the schematic in my head like that. I did think it was likely to be a short between the heatsink and the first D45H11 on the very left hand side, there's the faintest indication of arcing on its back.

I'll replace the parts and switch on without the heatsink fitted to check and then go from there replacing the power transistors from left to right if required.
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Old 2nd January 2013, 02:18 PM   #733
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by sq225917 View Post
Thanks Guys, Joachim, it wasn't that, it popped within a second of switch on.

FDW, I shall have to draw out parts numbered overlay for the board. I can't follow the schematic in my head like that. I did think it was likely to be a short between the heatsink and the first D45H11 on the very left hand side, there's the faintest indication of arcing on its back.

I'll replace the parts and switch on without the heatsink fitted to check and then go from there replacing the power transistors from left to right if required.
Listen carefully "DO NOT SWITCH ON WITH NO HEATSINK" it will destroy the shunt almost instantly! I shall say this only once - YouTube
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Old 2nd January 2013, 02:43 PM   #734
chiily is offline chiily  United Kingdom
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Quote:
Originally Posted by FdW View Post
Did you swap the measurements for TP201 and TP202 (also TP101 and TP102)?
Yep, I did...

TP201 -19.45
TP202 -18.07
TP203 -22.06
TP204 -0.533

TP101 19.66
TP102 18.06
TP103 22.16
TP104 0.552

That's more like it
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Old 2nd January 2013, 02:54 PM   #735
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by chiily View Post
Yep, I did...

TP201 -19.45
TP202 -18.07
TP203 -22.06
TP204 -0.533

TP101 19.66
TP102 18.06
TP103 22.16
TP104 0.552

That's more like it
O.k. these seem fine. Now try to lower the input voltage (add some series resistance to the transformer output (22ohm will drop (about) 8V (both channels running, else use 50ohm)). Do the scope measurement with and without the capacitors (as earlier mentioned).
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Old 2nd January 2013, 02:57 PM   #736
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The resistors have to stand 3W.
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Old 2nd January 2013, 03:56 PM   #737
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FDW, i removed the two D45H11 the one on the left was bust, the one closer to the centre was fine (though trashed for re-use). I replaced both of them with new and also the 337 that had popped.

Now all the LED's around the back of the heatsink light up but the bank on the left hand side don't. I'm guessing the 2nd 337 under the heatsink was fine, as its LED didn't pop- and the 2nd D45H11 was also ok- is that a safe assumption?

If so what next, replace the PMOS?
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Old 2nd January 2013, 04:17 PM   #738
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by sq225917 View Post
FDW, i removed the two D45H11 the one on the left was bust, the one closer to the centre was fine (though trashed for re-use). I replaced both of them with new and also the 337 that had popped.

Now all the LED's around the back of the heatsink light up but the bank on the left hand side don't. I'm guessing the 2nd 337 under the heatsink was fine, as its LED didn't pop- and the 2nd D45H11 was also ok- is that a safe assumption?

If so what next, replace the PMOS?
First give me the test-point voltages and the input voltages (as measured on the board). It also is (may be) smart to replace bort 337's.
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Old 2nd January 2013, 04:57 PM   #739
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Its done , the paradise runs , every light shines , the input offset is adjusted by 0V .
The output offset fluctuated at 30mV , frequenz of fluctuation is around 2Hz so my DMM says ( its a Uni-T 61E ) , whit a dummyload of 220 Ohm ( because my Colibri wants to see this load ).
I will let it burn in for a few days and look at the offset again .
After that iŽll listen and report.

One question , why a opa 134( use for audio) and not a special regulator opa ?
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Old 2nd January 2013, 06:03 PM   #740
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Quote:
Originally Posted by Doppelkopf View Post
The output offset fluctuated at 30mV , frequenz of fluctuation is around 2Hz so my DMM says ( its a Uni-T 61E ) , whit a dummyload of 220 Ohm ( because my Colibri wants to see this load ).
I will let it burn in for a few days and look at the offset again .
You guys make me crazy with this need to wait several days for the DC to settle. Whatever it is, a capacitor or anything else that is just at the edge of functionality - it is WRONG.

Regarding OPA134 - it is not bad for servo, for the reason of very low input bias currents and acceptable noise.
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