Hi,
First post, so be gentle. I'm trying to repair a Blaupunkt CDP09 car CD player from the early 1990's. I think the Laser head is duff. It's a KSS-164A, and I can't find any info on it or any spares.
However, I have found some KSS-164B's on eBay, and bought some in the hope I can adapt them to work. The main difference appears to be the flexi-pcb has right angle dog-leg connectors on the 164A, whereas the 164B is straight. I'm making up an adapter PCB that hopefully will allow me to use the 164B
What's confusing me is that on the 'new' 164B there is a solder 'blob' on the flexi-pcb shorting the Laser diode out. The same pads exist on the 164A, but there is no 'blob' shorting the pads together. I assume this blob is some kind of antistatic protection for the laser diode, and therefore will need removing before it'll work?
I've diode checked all the connections on the ribbon for both the 164A and 164B - the 6 reader head diodes read Vf=0.765V, and the laser photo diode reads Vf=0.675V in both. There is a difference in the laser diodes though - the LD reads Vf=1.203V in the new 164B (once the solder blob is removed) and Vf=1.521V on the old 164A. Hopefully the increased Vf on the old 164A is indication it's duff.
Cheers
Judwin
First post, so be gentle. I'm trying to repair a Blaupunkt CDP09 car CD player from the early 1990's. I think the Laser head is duff. It's a KSS-164A, and I can't find any info on it or any spares.
However, I have found some KSS-164B's on eBay, and bought some in the hope I can adapt them to work. The main difference appears to be the flexi-pcb has right angle dog-leg connectors on the 164A, whereas the 164B is straight. I'm making up an adapter PCB that hopefully will allow me to use the 164B
What's confusing me is that on the 'new' 164B there is a solder 'blob' on the flexi-pcb shorting the Laser diode out. The same pads exist on the 164A, but there is no 'blob' shorting the pads together. I assume this blob is some kind of antistatic protection for the laser diode, and therefore will need removing before it'll work?
I've diode checked all the connections on the ribbon for both the 164A and 164B - the 6 reader head diodes read Vf=0.765V, and the laser photo diode reads Vf=0.675V in both. There is a difference in the laser diodes though - the LD reads Vf=1.203V in the new 164B (once the solder blob is removed) and Vf=1.521V on the old 164A. Hopefully the increased Vf on the old 164A is indication it's duff.
Cheers
Judwin
You attach the Laser diode flex to the PCB and then remove the solder blob.
When disassembling a working one, first solder and then remove.
Power off first !!
When disassembling a working one, first solder and then remove.
Power off first !!
Thanks for confirming that.
Unfortunately there is no way to get to the solder blob once the flex is installed, so it will have to come off before installation. I'd best wear natural fibre under-crakers and use the anti-static bench at work then I suppose 🙂