M25 problem...

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Tomppa
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M25 problem...

Post by Tomppa »

So I had a stupid accident with the wiring and remote on amp touched ground... (don't even ask...) :doh:

Anyway it doesn't power on anymore, how much damage I have done? I had a look inside but I don't really understand that much about amps. Anyway I didn't see anything special, fuse was fine too.

I have pics if they help?
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stipud
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Post by stipud »

Hmmm... odds are you damaged the headunit, not the amplifier.

Disconnect the remote wire and run a jumper from B+ to R. Does the amp turn on? If so, it is fine, and the headunit was damaged.
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ttocs
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Post by ttocs »

most remotes have a fuse on them. If it doesn't work you can always use the 12v switched wire to turn the amps on with the key rather then the radio.
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Tomppa
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Post by Tomppa »

Tried using a jumper, nothing happens... Right now running a blaupunkt amp in the same set. Pretty much rushed to check everything was fine with another amp.

Another thing a bit OT, do you think the m25 would be good for running a xs104svc if I get it working?
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Shinju
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Post by Shinju »

open the M25 there should be an internal fuse near the power term check it.

if its still good then you toasted the amp/deck.
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Tomppa
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Re: M25 problem...

Post by Tomppa »

Tomppa wrote:Anyway I didn't see anything special, fuse was fine too.
Tomppa wrote:Right now running a blaupunkt amp in the same set.
Fuse is fine, headunit is fine...

E: So I tried the amp with a power supply and used a jumper for remote, red led "OVR" flashed but then nothing...
E2:For some reason there is around 4 volts from B+ to rem even when the rem is not connected, normal?
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tonym
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Post by tonym »

blown up power supply sounds like but not 100%... should wait for others to chime in..
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Shinju
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Re: M25 problem...

Post by Shinju »

Tomppa wrote:
Tomppa wrote:Anyway I didn't see anything special, fuse was fine too.
Tomppa wrote:Right now running a blaupunkt amp in the same set.
Fuse is fine, headunit is fine...

E: So I tried the amp with a power supply and used a jumper for remote, red led "OVR" flashed but then nothing...
E2:For some reason there is around 4 volts from B+ to rem even when the rem is not connected, normal?
that maybe but I said check the fuse inside the M25 not your power cable fuse.
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marko
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Post by marko »

just because the fuse didn't blow doesn't mean that something hasn't blown! you need to start ohming out the mosfets to see if any have blown.
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Tomppa
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Post by Tomppa »

Like I said in the first post I opened the amp and checked the fuse there.

How do I check the mosfets?
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rolandk
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Post by rolandk »

There is a transistor in the remote circuit near the fuse that is probably shorted out. Don't remember the reference designator (Q2?) but it should be a ZTX749 or MPS750.
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