Hi cosmin_nfmdeva,
From what you have told us, a specialist might be a good idea. This amplifier has been modified in a way that makes it tougher to troubleshoot. It looks like you have an original problem, circuit changes and a new problem due to the previous ones.
This all makes it hard to figure out if you are not used to these things.
-Chris
From what you have told us, a specialist might be a good idea. This amplifier has been modified in a way that makes it tougher to troubleshoot. It looks like you have an original problem, circuit changes and a new problem due to the previous ones.
This all makes it hard to figure out if you are not used to these things.
-Chris
tks anatech..i think is not a big problem to repair it now that i have the schematics. tks again
Hi cosmin_nfmdeva,
Okay, if you want to have a poke at this, try to find the original fault. Note that everything you find may not be related to each other directly.
-Chris
Okay, if you want to have a poke at this, try to find the original fault. Note that everything you find may not be related to each other directly.
-Chris
hi.i have the same amplifier.. and the transistor c2578 and A1103 are borned. but i can't get the A1103. Somebody know the replacement?
one last question. where i can get the schematic? because i can't open the link in the first page
one last question. where i can get the schematic? because i can't open the link in the first page
Hi Mark,
That's a speaker protector chip. It handles the turn on delay, AC power detection (in some circuits) and DC offset detection. A handy chip that makes building a speaker protection circuit very easy.
In case this would help someone, I looked up the datasheet. Here is one PDF on the HA12002. It is very easy to use.
They don't often fail, so go ahead and build a protector for your DIY amp - someone!
-Chris
That's a speaker protector chip. It handles the turn on delay, AC power detection (in some circuits) and DC offset detection. A handy chip that makes building a speaker protection circuit very easy.
In case this would help someone, I looked up the datasheet. Here is one PDF on the HA12002. It is very easy to use.
They don't often fail, so go ahead and build a protector for your DIY amp - someone!
-Chris
Hi fcasop55,
Try 2SC2580 or 81 and 2SA1105 or 06. The ratings are higher, but they are the same transistor other than that.
-Chris
You will need more part than that.
Try 2SC2580 or 81 and 2SA1105 or 06. The ratings are higher, but they are the same transistor other than that.
-Chris
My AV centerpiece for years, a Kenwood KA-V7700, silently went to "sleep" a month or so back. No drama, no nothing, wont even power up!. Any hope of reviving this beast myself or should I just toss it?.
Being in Nairobi, Kenya, I am fighting the crazy temptation to send the whole 30 kg (mebbe less) of it over to any repair shop that can repair the unit (Frightful of freight $$$!). Is this vintage amp still supported? Anyone has a service manual for it?
The foregoing thread (which I have no intention whatsoever of hijacking...) is driving me to seek help in terms of schematics etc, to try and revive the amp by meself, and I am desperately looking for leads.... Could someone point me in the right direction?
PS:I also have a TEAC AG-10 (?) that refuses to come out of standby mode....
Clearly, serious HELP is required in Nairobi...
Being in Nairobi, Kenya, I am fighting the crazy temptation to send the whole 30 kg (mebbe less) of it over to any repair shop that can repair the unit (Frightful of freight $$$!). Is this vintage amp still supported? Anyone has a service manual for it?
The foregoing thread (which I have no intention whatsoever of hijacking...) is driving me to seek help in terms of schematics etc, to try and revive the amp by meself, and I am desperately looking for leads.... Could someone point me in the right direction?
PS:I also have a TEAC AG-10 (?) that refuses to come out of standby mode....
Clearly, serious HELP is required in Nairobi...
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