Hello Salar,Dear Friends,
I am so happy to read this thread!
I had this idea 12 years ago but completely lacked the technical knowledge.
https://www.diyaudio.com/community/...kups-why-not-replacing-the-diode-only.158257/
Around 2018 I gave a working CDP-102 player, one BU-1 and ten LT022 diodes
(First generation diodes) to a DIYAudio-member to figure a diode swap.
He completely let me down on this and never sent me the items back until today.
(Interestingly he also never contributed to this thread.)
I also was very much consumed with documentary filmmaking the last 3 years, a 25/7 job:
https://fishermansframe.gumroad.com/l/abtyf
And the next documentary is already ahead - besides regular work-
so I do not know for the near future whether I will find the time to
built my own rig and start exploring the diode replacement.
So it is just great to read this and how far the project has progressed!
But there is one thing I do not understand:
Does the photodiode array always has to be aligned?
Because in a Sony BU-1, the first linear transport, the diode could be moved.
It is not glued in the cabinet of the laser assembly but fixed with a spring and
whashers that allow alignment and tilting in horizontal position.
Same with KSS123A. But it could be that this design was an exception.
This was not covered here yet:
I also looked into single beam Philips CDM-1 swing arms.
There, the diode (Also a Sharp LT-022MC) is pressed into an aluminium tube.
The photodiode array is glued to the mech, with 2k epoxy.
So if they really did it by aligning the array, it was time consuming.
Very interesting:
In the first gen. CD-100, the tube with the laser diode could be replaced!
https://elektrotanya.com/philips_cd100_cd_player_1983_sm.pdf/download.html
This was the times shortly before globalisation - the service manual is in german, look for page 8
Best,
Salar
nice to see some message from you. Hope all is fine. Pity that there is no time to continue the work on this topic
