Sony CDP-227ES: Misaligned laser lens KSS-151A

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…

Cause: Soldering/PCB

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.

Sony assembly

Denon assembly

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.


3 comments on “Sony CDP-227ES: Misaligned laser lens KSS-151A

  1. 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?

    • Hi,
      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.

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