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urei 1601e power supply?

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service dept Steve View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote service dept Steve Quote  Post ReplyReply Direct Link To This Post Topic: urei 1601e power supply?
    Posted: 05 July 2021 at 10:52am
It sounds as if you are getting the three voltages at the power supply, why do you think that the fault in the headphone output has anything to do with the power supply directly? Could this "high" voltage at cn11 be +30v thereby meaning you have a low - voltage (ie an unbalanced output because of no 0v connection)? These mixers are a very poor design, there is no protection from faulty components and there is always the likelihood that you have a failed headphone amp which could pull the +-15v down. Usually though the amp goes short circuit and kills the mixer by burning all the way back to the processor.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fabianmu Quote  Post ReplyReply Direct Link To This Post Posted: 04 July 2021 at 3:29pm
Hello Forum, 

my PSU on my Urei 1601e also broke and im glad that these mixers still have owners. 

My Problem started with not getting any Headphone output, this was years ago and i nearly forgot it. I resently picked it up to get my old 1210 running and desided to give it a try to repair. 
First thing i did, was removing the front panel and desoldering the headphone jacks. After checking the voltages on the cn11 header i noticed very high voltages between ground and v+.

I removed the psu and unplugged cn2 to messure it direclty and getting different voltage levels as described in the schematic. 

I think i have a blown component around ic1 but could not find a damaged one. Desoldered and checkt D1, D2, R16 and C8, they seam to work.

could the IC1 (UCC3842A) be damaged? Some pointers what to check would be appreciated.

Or should I stop worrying and get a new PSU ? in this case, which one should i get.

Every help is appreciated.
Best 
Fabian 



Edited by fabianmu - 04 July 2021 at 4:21pm
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macros View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote macros Quote  Post ReplyReply Direct Link To This Post Posted: 22 June 2021 at 4:53pm
If you look carefully in the schematics, you will see the power connector and its voltages

+8V
GND
+15V
GND
GND
-15V

I would not recommend trying to fix the PSU yourself, it can kill you for real!

I would also not recommend fixing this PSU, just get an alternative (switching one)



Edited by macros - 22 June 2021 at 4:54pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote t_groove Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2021 at 9:03am
Ciao a tutti
 ho bisogno di aiuto, ho UREI 1601 con alimentatore danneggiato.
Chiedere a STEVE ea tutti gli utenti se possono darmi la tensione di alimentazione come nella scheda di potenza scrivere:
+ V2
-V2
+ V1
Agnd
Agnd
-V1
 
Se non รจ molto costoso quanto per la riparazione?
considera che sono italiano.
Grazie per la risposta
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Post Options Post Options   Thanks (0) Thanks(0)   Quote t_groove Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2013 at 10:11pm
hello to all
 i need help , i have UREI 1601 with power supply damaged.
Ask to STEVE and to all users if can give me the power supply voltage like in the power board write:
+V2
-V2
+V1
Agnd
Agnd
-V1
 
If is not much expensive how much for repair ?
consider that im from Italy.
thanks for the answer
 
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Post Options Post Options   Thanks (1) Thanks(1)   Quote service dept Steve Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2010 at 9:01am
Yes, worked on plenty of those, none of it is aided by ease of access!
I might be able to give you some pointers but unfortunately you would need to pm me because the inner workings of a smpsu is possibly not a good subject for open discussion just in case someone is watching whose needs exceed their skills! 

steve
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2010 at 12:38am
What about the PSU in a Soundcraft E8?  Played with those?  Got a long-term resident one in the workshop which refuses to be repaired.  I've verified everything except the SMPS transformer.  The PSU runs but only until the bootstrap supply is exhausted because the auxillary supply isn't coming up.  It's the second one I've had through my door with the same problem, never managed to fix the other one either.

I'll have another look one day.  It's not really worth buying a new PSU because it'd cost as much as buying another desk second hand.

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service dept Steve View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote service dept Steve Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2010 at 11:50pm
Right, I've just heard from boycey that his power supply is installed and working.
Satisfied customer, I usually like to kill 'em and hang them on the workshop wall.
 And no, don't work on one yourself, 400v stings.
Steve



Edited by service dept Steve - 14 March 2014 at 7:22pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JR.junior Quote  Post ReplyReply Direct Link To This Post Posted: 01 February 2010 at 9:46pm
Originally posted by boycey boycey wrote:

Originally posted by JR.junior JR.junior wrote:

the power supply primary100-230V , secundary ?V, 50W.


indeedLOL
 
hehe this is all what I can tell you. LOL 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boycey Quote  Post ReplyReply Direct Link To This Post Posted: 01 February 2010 at 9:45pm
pmed!
the only thing more dangerous than a person who doesn't give a f**k is a person who gives a sh*t.
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service dept Steve View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote service dept Steve Quote  Post ReplyReply Direct Link To This Post Posted: 01 February 2010 at 9:38pm

Assuming it hasn't caught fire or been run over by a lorry
I will be able to mend it for you.



Edited by service dept Steve - 23 February 2015 at 8:56am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boycey Quote  Post ReplyReply Direct Link To This Post Posted: 01 February 2010 at 9:36pm
Originally posted by JR.junior JR.junior wrote:

the power supply primary100-230V , secundary ?V, 50W.


indeedLOL
the only thing more dangerous than a person who doesn't give a f**k is a person who gives a sh*t.
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