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Old 13th January 2012, 11:50 AM   #961
Zen Mod is offline Zen Mod  Serbia
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black-red : one secondary
orange - yellow : another one

if that's the case , they're connected as needed , looking at pictures

having them so big is useful .............
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Old 13th January 2012, 11:54 AM   #962
oiphy is offline oiphy  Norway
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Default *facepalm

Quote:
Originally Posted by mikojat View Post
I think, 50 VDC you got from V+ and V-? not from V+ and Gnd or V- and Gnd,..Do you?
digging hole to china and going to bury myself....... so emberrased...
yes you're right... but found another fault on the board..... seems that if i connect the left side of the board i get 50 v from + to- but nothing from- to gnd??? se underside of board??? seems to me that there r something not cut away...
will resolder to other side and see.
thank
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Last edited by oiphy; 13th January 2012 at 11:57 AM.
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Old 13th January 2012, 11:55 AM   #963
Zen Mod is offline Zen Mod  Serbia
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clarify ....... yay or nay
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Old 13th January 2012, 12:00 PM   #964
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Originally Posted by Zen Mod View Post
make one
The classic : The Dim-bulb Radio Tester
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Old 13th January 2012, 12:11 PM   #965
oiphy is offline oiphy  Norway
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only psu connected at this time.
1. colors:
pri is blu and brown
sec1 is red black
sec2 is orange yellow
tested psu + to gnd is 24,9v
- to gnd is 25.0v
so guess this is ok for now. wires will be changed and twisted when amp is fired up and stable. will also shield trafo.
going to make bulb tester... or can i use an Amperemeter around 1 fase (live)

thanks

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Originally Posted by Zen Mod View Post
first - search for "bulb tester" ( AndrewT is strong proponnt of that tool , with reason) ;

make one

connect amp via BT (say that 40-60W is good for start)

disconnect amp pcbs from PSU and test just PSU

from pics I see that you connected Graetzs as needed - check polarity 3 times before powering up!

power up and measure voltage on each output

BT will lit brightly and dim after sec-2 if everything is OK

if BT is bright for prolonged time , something is wrong

measure voltage between each + and gnd - you can expect DC voltage in range Vac x 1.41

measure voltage between each - and gnd - same voltage ( opposite polarity , off course)

example - for 18Vac secondaries , you can expect 18x1,41~25Vdc

when you are done with that , report here

but first !! write what wire colors are written on xformer - we need to check did you connected secondaries as needed
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Old 13th January 2012, 12:17 PM   #966
Zen Mod is offline Zen Mod  Serbia
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OK - for now everything is fine

you can proceed ( with BT ) with output connected
I'm not familiar with these pcbs , so I can't check visually is everything connected as needed
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Old 13th January 2012, 12:20 PM   #967
AndrewT is offline AndrewT  Scotland
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- to gnd measures 25V
+ to gnd measures 24.9V

You must specify +- and whether dc or ac.

I would expect to see + to gnd showing +24.9Vdc
and - to gnd showing -25.0Vdc

If your meter read + for both supplies, then you must have mixed up (swapped) your test probes.

Primary.
Blu is to Neutral
Brn is to Live.

But in mains wiring you must consider both L & N to be equally dangerous.

Due that condition, both L & N are insulated to the same standards.
This allows one to swap the transformer Blu & Brn to the "wrong" terminals. Some times a transformer behaves/performs slightly better when wired up "correctly" and sometimes when wired "wrong".

But ensure the mains fuse is still in the LIVE side.
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Old 13th January 2012, 12:24 PM   #968
mikojat is offline mikojat  Indonesia
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I see, seem the negative rail connected to ground...If yes, cut it...cutter will work easy.. , so, is no wonder if you can't measure between V- and Gnd
Attached Images
File Type: jpg downside fualt.jpg (94.7 KB, 181 views)

Last edited by mikojat; 13th January 2012 at 12:44 PM.
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Old 13th January 2012, 12:34 PM   #969
oiphy is offline oiphy  Norway
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ok. BT complete. connected and it litt up in 1-2 sec and turned off.
so now I guess I shold connect the psu to main board?

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Originally Posted by Zen Mod View Post
OK - for now everything is fine

you can proceed ( with BT ) with output connected
I'm not familiar with these pcbs , so I can't check visually is everything connected as needed
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Old 13th January 2012, 12:37 PM   #970
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http://dl.dropbox.com/u/57077275/downside%20fualt.jpg
is it this u see??

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Originally Posted by mikojat View Post
I see, seem the negative rail connected to ground...If yes, cut it...cutter will work easy..
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