Aleph 3 standby mode, possible turn off - Page 2 - diyAudio
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Old 11th September 2012, 08:06 PM   #11
mercc is offline mercc  Slovakia
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DC voltages are 18 and 17 volts. Also noticed AC voltages on the wires to the four heatsinks.
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Old 11th September 2012, 08:13 PM   #12
Zen Mod is offline Zen Mod  Serbia
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DC voltages are too low

I don't understand what you mean with "AC voltages on the wires to the four heatsinks"
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Old 11th September 2012, 08:30 PM   #13
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i quess the AC voltage from transformer to diodes
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Old 11th September 2012, 08:35 PM   #14
mercc is offline mercc  Slovakia
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PSU DC voltages i measured on pins two grounds and plus, minus before capacitors. Then on ground before capacitors and on pins v plus, minus, and src, out, based on schematics. Also measured AC voltages on DC ground and mentioned pins and there appears to be AC. Dont know what exactly AC voltage should be on the colored wires to the transformer in the manual schematics i didnt found it. I think the transformer could be the problem. Sorry, Im a bit tired or something.
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Old 11th September 2012, 08:41 PM   #15
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meassure DC AFTER the caps.
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Old 11th September 2012, 08:42 PM   #16
Zen Mod is offline Zen Mod  Serbia
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considering that you have lack of electronic experience ,only way to finish this is - post exact schematic (from SM)ofr your amp , and post pictures

then we can communicate making marks on schematic and pics

either that , or send amp to someone with adequate knowledge
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Old 11th September 2012, 09:07 PM   #17
mercc is offline mercc  Slovakia
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Where to measure DC after the caps?
Also i noticed that the chasis is grounded right to the caps outside earth ground and that caps in the turned off state had voltage near 12 volts. When I opened it, discharged caps, after a while it gradually charged again.
It is standard amp or original, only capacitors and irf9610 and irfd9110 were changed.
Dont know if someone has adequate knowledge about aleph or amps in as such.
If i can ask, why is the resistor called bleeder?
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Old 11th September 2012, 09:14 PM   #18
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between PSU and amp board.
the resistor is caled bleeder becouse it bleed out the voltage from the caps when the power is turned off.
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Old 11th September 2012, 09:34 PM   #19
RS232 is offline RS232  United Kingdom
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Quote:
Originally Posted by mercc View Post
Where to measure DC after the caps?
Also i noticed that the chasis is grounded right to the caps outside earth ground and that caps in the turned off state had voltage near 12 volts.
You measure DC on the same points where you measured the AC...
The thing is like this
220/240V inlet goes to transformer to the rectifiers (before the rectifiers you have AC)
From the rectifiers to the capacitors to the boards you have DC...
The only thing you have to do is switch the voltmeter/multimeter from AC to DC and check on the capacitor (positive(red lead) to ground (black lead) and from ground (red lead) to negative (black lead)).
The leads are from the voltmeter and not the wires on the amp.
I'm no expert on the Aleph 3 but you should have around 26VDC on each side of the capacitor bank.

Ric

Last edited by RS232; 11th September 2012 at 09:39 PM.
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Old 11th September 2012, 09:44 PM   #20
mercc is offline mercc  Slovakia
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One amp board is horizontal in the middle with capacitors and two thermistors and four boards are vertical with transistors, resistors, smaller capacitors and heatsinks. Voltage before capacitors i think should be similar to voltage after capacitors. Side amp boards are connected to caps board with white square hard wires, two of the boards havent them straight because it was a bit difficult to put it upside down with the bigger heatsinks removed. I measured the voltages in the point where transformer connects to PSU horizontal board and on PSU horizontal board where are attached white square hard wires.
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