An old Sony CD Player but very well reserved, came in the original box. Had been in shop storage for a very long time.
In mint condition, but unfortunately it does not read any CDs, so that’s why it’s here on the workbench.
Always happy to see good Philips components in CD Players… 🙂
It’s a double TDA1541A-R1 setup surrounded by conventional (no SMD) capacitors.
Of course Sony would use one of their own laser units, this time a KSS-151A without the geared motor for tracking, but lineair servo controlled.
Issue: Missing voltage, wobbly components…
Lets disassemble some…
The soldering on this cd player is very poor as well as the PCB and copper traces on it.
Transistor was disconnected which caused the missing voltage.
The connecting PCB between laser unit and main PCB
Bottom side with a bunch of bad solder joints.
Issue: Lens alignment
Unfortunately the fixes of the soldering and PCBs did not (yet) bring the cd player back to life.
Further investigation on the mechanical side I saw that the lens of the laser unit was not exactly straight above the laser.
Because a new laser is not available anymore, a donor cd player was the best option.
This was found in a Denon cd player, but the laser assemblies were not really alike.
The laser unit as to come off, including those fragile orange flex cable solder joints.
On the left the “old” Sony laser unit, on the right the “new” Denon
No more pictures. I haven’t taken a picture of the reassembled laser and running cd player.
I wonder how the metal near the lens became so twisted, totally abnormal. It should have been perfectly plane like Denon (I have the unit and I checked). Did you destroy it trying to measure something underneath?
That’s just a black plastic cap that covers the focus coils. It was shaped like this from the beginning I opened the cd-player.
If you need to remove that cap, it’s easily done. It has two clips on each side. (See the article about the Denon cd-player, which had a similar type of cap removed.)
I’m not sure if it was shaped that way by design. I cannot recall if the shape was symmetrical or got very hot and deformed somehow.
Actually by design it’s perfectly plat, i can wow for this because i have one at hand (in perfect order). You can find more pics here: http://www.lampizator.eu/lampizator/REFERENCES/sony%20227esd/sony227.html
To me it seems melted, perhaps this did have something in common with the lens problem (overheating underneath?).
Anyway, a great sound machine, wonderful build and designed, a pleasure to operate and behold event after 30 years 🙂