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Old 5th January 2014, 09:01 PM   #1
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Default Alto Macro 2400 Amp

Okay, so I got this amp for free, but it's not working. Open it up, and saw the two 10K pots are completely broken off. And also the protector LED- is broken off, but I can't seem to figure out where it should go. The + is soldered onto Q5, and that's where it loses me. How do I go about fixing this? Any help will be highly regarded! Thanx in advance.

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Old 6th January 2014, 05:17 PM   #2
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Nobody?????? Is there anybody who has the same amp, or know of someone that does? Please, look, if you don't want to help me it's fine, at least point me in some direction where there will actually be someone who does! Please!
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Old 6th January 2014, 05:45 PM   #3
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Its obviously a specialised and uncommon amp. There are almost certainly other issues with it. Have you done basic cold checks on the output stages to get an idea of whether its blown up or not ?
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Old 6th January 2014, 06:02 PM   #4
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Post Service manual

OK. Got a service manual with schematic from the internet. At least something to start with.

Alto Macro 830, 1400, 2400

madstayen, have you got a tester? Can you check the fuses and measure the voltages at the power rails for the beginning please?
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Old 6th January 2014, 06:03 PM   #5
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cold checks? Do you mean inspecting visually. Yes, I did. Everything looks good, it's just the pots, and prot LED.
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Old 6th January 2014, 06:06 PM   #6
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Thanx for the manual vzaichenko. I do have a tester. Where do I measure this?
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Old 6th January 2014, 06:06 PM   #7
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I mean checking with a DVM on resistance and diode ranges that there are no shorted output transistors and that non of the low value emitter resistors on the outputs are open circuit. And a visual check too looking for burned or overheated components etc
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Old 6th January 2014, 06:10 PM   #8
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Quote:
I mean checking with a DVM on resistance and diode ranges that there are no shorted output transistors and that non of the low value emitter resistors on the outputs are open circuit. And a visual check too looking for burned or overheated components etc
Would that physically mean downloading the data sheet of each component (there are a couple of thousand) and then verifying the voltage/resistance/capacitance of each? Isn't it easier then to just buy a new amp???
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Old 6th January 2014, 06:10 PM   #9
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Did you already try to power it on?
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Old 6th January 2014, 06:12 PM   #10
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No, Mooly means the power supply rectifier diodes and output transistors mainly... big ones...
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