MrRadish
21-03-2017, 17:50
This is probably a bit specific but maybe there's an old Technics service department person on AoS? I should be so lucky...
I've been getting into old CD players and ended up with, amongst others, an SL-P350 and SL-P990. Both worked when I got them although both sounded flat and crap, probably due to the capacitors being long past their prime. The 990 used as a transport showed real potential though and I started to use it that way but it quickly developed a fault and would jump on certain discs (classic ebay quality). Long story short I found some sticky stuff on the rails and cleaned that off.
But before I did that I had a working 350 and believed the transports to be the same so decided to swap them over. It was only when I'd taken them both out that I discovered the 990 has a separate plate on the underside with what appears to be a bank of additional capacitors. As the mechanisms were different I then put them both back into their original players. This is just plug and play stuff, no soldering required. All back as it was, except possibly the screws holding the drives in place not being in the same location, neither player would find the TOC on any disc. I'd succesfully broken both of them!
The discs spin, I can see a red laser coming out (being careful not to look right at it), the laser sled slides to the centre of the disc and the focusing mechanism goes up and down. Everything seems fine but it never reads the disc. On the 990 I tried playing around with the yellow adjustment pots, spending about an hour at random and then finding the service guide and setting them to factory defaults. On the 350 I haven't touched the pots. On the 350 I also (later) tried wiping the stiff circuit bit (if you've seen inside the players you'll know the bit I mean) with isopropyl alcohol and sprayed all the connections with deoxit before reattaching them.
No joy. The disc spins and spins but it never brings up the TOC or plays. Anyone seen this before? Have I simply broken two players in identical ways at the same time? :doh:
I've been getting into old CD players and ended up with, amongst others, an SL-P350 and SL-P990. Both worked when I got them although both sounded flat and crap, probably due to the capacitors being long past their prime. The 990 used as a transport showed real potential though and I started to use it that way but it quickly developed a fault and would jump on certain discs (classic ebay quality). Long story short I found some sticky stuff on the rails and cleaned that off.
But before I did that I had a working 350 and believed the transports to be the same so decided to swap them over. It was only when I'd taken them both out that I discovered the 990 has a separate plate on the underside with what appears to be a bank of additional capacitors. As the mechanisms were different I then put them both back into their original players. This is just plug and play stuff, no soldering required. All back as it was, except possibly the screws holding the drives in place not being in the same location, neither player would find the TOC on any disc. I'd succesfully broken both of them!
The discs spin, I can see a red laser coming out (being careful not to look right at it), the laser sled slides to the centre of the disc and the focusing mechanism goes up and down. Everything seems fine but it never reads the disc. On the 990 I tried playing around with the yellow adjustment pots, spending about an hour at random and then finding the service guide and setting them to factory defaults. On the 350 I haven't touched the pots. On the 350 I also (later) tried wiping the stiff circuit bit (if you've seen inside the players you'll know the bit I mean) with isopropyl alcohol and sprayed all the connections with deoxit before reattaching them.
No joy. The disc spins and spins but it never brings up the TOC or plays. Anyone seen this before? Have I simply broken two players in identical ways at the same time? :doh: