Hello,
I bought my alpha+ CD player in 1991 (I think) and now one of the audio outputs is failing. I power up the player and play a CD, it plays ok for about a minute and then there's alot of noise from the left channel and stays there. The right channel seems ok but with the noise from the left it's a bit difficult to tell even with the balance turned over to the right.
Anyway I know it's old but I love it. It's the first proper CD player I have bought. My question then is how can I go about fixing it or even upgrading it in the process of doing so. I'm not an electronics engineer but I am handy with a soldering iron having fixed many a PC in my time.
Thanks
Stoneditch
I bought my alpha+ CD player in 1991 (I think) and now one of the audio outputs is failing. I power up the player and play a CD, it plays ok for about a minute and then there's alot of noise from the left channel and stays there. The right channel seems ok but with the noise from the left it's a bit difficult to tell even with the balance turned over to the right.
Anyway I know it's old but I love it. It's the first proper CD player I have bought. My question then is how can I go about fixing it or even upgrading it in the process of doing so. I'm not an electronics engineer but I am handy with a soldering iron having fixed many a PC in my time.
Thanks
Stoneditch
You are going to have to come up with a circuit, but a couple of things anyway.
First make sure that the fault really is on one channel by connecting each RCA output (L and R) one at a time to a single known good amp input... let's be sure.
If the fault appears after a minute or two and is loud "digital" hash then it might be worth trying dripping (not blasting) a little freezer spray on the DAC/s and any RAM chip that might be used and also on the opamps (they wouldn't cause digital type noise)
Without seeing a circuit it's impossible to help more really without actually working on it for real. A scope check working backwards from the outputs is an obvious step, also check ALL rails from the PSU not just on a DVM but with a scope too to check for noise and ripple (dried out caps etc)
First make sure that the fault really is on one channel by connecting each RCA output (L and R) one at a time to a single known good amp input... let's be sure.
If the fault appears after a minute or two and is loud "digital" hash then it might be worth trying dripping (not blasting) a little freezer spray on the DAC/s and any RAM chip that might be used and also on the opamps (they wouldn't cause digital type noise)
Without seeing a circuit it's impossible to help more really without actually working on it for real. A scope check working backwards from the outputs is an obvious step, also check ALL rails from the PSU not just on a DVM but with a scope too to check for noise and ripple (dried out caps etc)
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