Cleaning them is not such a bad idea, after all there's still a laser shining on the disc surface, and any stray light caused by a film of dirt will affect the HF signal. Most stuff is perfectly technically explainable.
Funny how the CD has a digital character, but a lot of technique behind it is just analog 🙂
Funny how the CD has a digital character, but a lot of technique behind it is just analog 🙂
hi ray, ive done some simple mods ie op amps lm4562s iec mains conversion and damped the case and transport on my 63se is hdam by pass next to do
many thanks alan
many thanks alan
I was posting about something else, but just in case Ray is busy bikeral. I think he will say yes. Once you have good op-amps the hdam is only making things worse. I think you will find the procedure on page 1 and 2 of the thread.
Does anyone know where I can buy original vam lasers from on-line. Every time I think iv'e found one I end up with a non-working chinese copy. My cupboard's full of them. There used to be a time when they came in a philips fawn box and with wires. I now find the same is happening with the Sony lasers too. I'm not trying to get them cheap, just real!
bikeral, your next job should be some power supply work. Try adding 7805 voltage regulators on each of the DAC, decoder and servo supply voltage pins. After that you could bypass the HDAM a bit more safely.
If you have a cupboard full of old lasers, check out the threads on repairing them - worth a try.
http://www.diyaudio.com/forums/digital-source/118902-stripdown-clean-cdm12-4-a.html
Seems a lot of working drives have been thrown away when all they require is cleaning on the underside of the lens.
You've got to have good eyesight and a steady hand though !
Andy
(sent by satellite from somewhere close to the Seychelles)
.
A
often on those chineese lasers, all thats needed is the spindle needs lifting slightly.
Worth a try if you have several. I've had a few that just dont work, but I've neve had one that didn't after adjusting the cd mount on the end of the spindle. They've normally be squashed at some point an a small screw driver to lever then up a fraction is enough. Make sure you apply pressure evenly all the way round!!!
Worth a try if you have several. I've had a few that just dont work, but I've neve had one that didn't after adjusting the cd mount on the end of the spindle. They've normally be squashed at some point an a small screw driver to lever then up a fraction is enough. Make sure you apply pressure evenly all the way round!!!
cheers barry, simon ive got some lm340 s do the same job wont they was gonna use them in the psu with some lm 317 s tho
cheers guys
cheers guys
Thanks everyone for your input. I'll try sripping and cleaning the old ones and look at the spindle position before I chuck them. Cheers
anyone give me a clue how to get a cd63 in test mode plzthanks alan just brought a cd 63 not spinning up cheers alan
It's either the laser or in transit the disc platter has dropped. (unless it's a badly modded unit).
Brent
Brent
thx rowemeister,chivvyp
im modding 2 more marantz a 63se and a 52se done op amps on both damping the case iec on the cd63se worlds apart in sound got lm4562s in the 63se and op2604s in the 52se been reading this thread for ages i need a plan to tackle mods while im not useless with a iron id love to learn how to do it myself
cheers alan
im modding 2 more marantz a 63se and a 52se done op amps on both damping the case iec on the cd63se worlds apart in sound got lm4562s in the 63se and op2604s in the 52se been reading this thread for ages i need a plan to tackle mods while im not useless with a iron id love to learn how to do it myself
cheers alan
brent ,
the cd 63 with laser trouble is a machine i brought off ebay for a tenner so 3 marantz ive got
cheers alan
the cd 63 with laser trouble is a machine i brought off ebay for a tenner so 3 marantz ive got
cheers alan
hi,
I need a schematic for the cd63 ,Or can anyone tell me the voltage feed pins for the dac,decoder and the servo as i want to run seperate voltage regs for each component many thanks alan
I need a schematic for the cd63 ,Or can anyone tell me the voltage feed pins for the dac,decoder and the servo as i want to run seperate voltage regs for each component many thanks alan
They're all 5V.
IIRC you have +/-10V you should regulate first, +/-12 for op amps. Some other odd voltages like display but not sound related.
IIRC you have +/-10V you should regulate first, +/-12 for op amps. Some other odd voltages like display but not sound related.