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Old 13th February 2008, 11:37 AM   #1
jives11 is offline jives11  Europe
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Default repair Acoustic Solutions SP101: dead transformer ?

Hi,

I picked up a dead amp from a recycle scheme. It's a cheap brand sold in the UK (Acoustic Solutions) but not too bad. I thought I'd try and get it working to use in my den.

At power on nothing happens, no display, no red LED.

I'checked the fuses internal and external, and measuring the voltages I see mains AC across the torroids inputs but the 23-0-23 outputs measure hardly any AC voltage ? The Transformer looks fine, no signs of wear & tear. Can they just fail ? maybe it's a rejected unit with a bad transformer, but one of the 1/2 watt resistors on the main board looks like it's been used as there is some thermal discoloring.
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Old 13th February 2008, 11:58 AM   #2
Netlist is offline Netlist  Belgium
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With power disconnected, try measuring the primary winding(s) of the transformer. Should only be a couple of ohms.

/Hugo
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Old 13th February 2008, 12:18 PM   #3
jives11 is offline jives11  Europe
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Quote:
Originally posted by Netlist
With power disconnected, try measuring the primary winding(s) of the transformer. Should only be a couple of ohms.

/Hugo
Thanks. It appears to be open circuit, so I guess the transformer is dead.
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Old 13th February 2008, 01:05 PM   #4
Netlist is offline Netlist  Belgium
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That's a quick and bulletproof diagnose unless the transformer has a build-in thermal fuse which is highly unlikely in cheap gear.

/Hugo
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Old 13th February 2008, 01:54 PM   #5
poynton is offline poynton  United Kingdom
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Default Re: repair Acoustic Solutions SP101: dead transformer ?

Quote:
Originally posted by jives11
Hi,

I picked up a dead amp from a recycle scheme. .........

Do Hampshire stil operate their recycling sheds at the tips?

I used to go to Aldershot or Bordon tips as they had them rather than Farnham (in Surrey) which did not.

Many bargains to be had!!!!!

Andy
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