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-   -   Aleph 3 standby mode, possible turn off (http://www.diyaudio.com/forums/pass-labs/219544-aleph-3-standby-mode-possible-turn-off.html)

mercc 11th September 2012 05:20 PM

Aleph 3 standby mode, possible turn off
 
Hi,

I noticed that turned off Aleph 3 has charged capacitors, only on one side in this case of propably not properly functioning one (about half power consumption, bit of distorted sound when turned on), so I think it is maybe active somewhat. I want to ask if its possible to turn it off and if it can be in the turned off state.

Thank you for your response.

Zen Mod 11th September 2012 05:26 PM

which , what , how

pics , please , and more info

mercc 11th September 2012 05:35 PM

What more info?

Zen Mod 11th September 2012 05:38 PM

pictures , so you don't need to put efforts in explaining is your Aleph DIY or original,does it have bleeders on caps , how much capacitance etc.

mercc 11th September 2012 06:10 PM

It is original Aleph, capacitors are changed to Vishay 12000 hours, 85 C, some of the originals were a bit bulged. Capacitance is the same 8x22000uf. Read something somewere about the bleeders but dont know what it is. When i was changing capacitors, the IRF 9610 stopped working, now i found out that one was changed, i measured the previous one and seemed ok so now the IRF 9610 are original. The four IRFD 9110 were changed too. Tried to measure only with diode tester but the values of the originals varied a bit so i didnt changed them.

Zen Mod 11th September 2012 06:16 PM

put 2K2/3W resistors across each cap bank (both positive and negative) ; those are bleeders

regarding rest of your first post , I'm not getting what and when/how long is distorted

mercc 11th September 2012 06:41 PM

I posted 2 posts so i tried to reference it to second post. Aleph has about half power consuption as normal, when music is played the sound is a bit distorted. Also found out that one of the 3W resistors on the bottom of one pcb was a bit released so i soldered it.

Zen Mod 11th September 2012 06:46 PM

both channels distorted ?

any hum or buzz ?

are you able to open it and do some strategic measurements ?

best way is , if I post schematic here , that you write measured values directly on schematic

in MS Paint or any similar prog

mercc 11th September 2012 07:25 PM

Yes, I think both. I think the hum is a little, as was previously. One of the reasons i tried to change capacitors, but i think later the hum remained still. I have it opened now, schematic is in the service manual, but some simplified or better to understand schematic would be maybe good.

Zen Mod 11th September 2012 07:30 PM

1 Attachment(s)
there is no simpler schematic than in SM

download this , print and study few days ;it's best if you can understand what's what .

for start - check PSU voltages


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