ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Welcome back, Menahem!
I haven't done any B&O in a while.
A lot of TV repairs, but here I have a butchered CD-X for restoration, not working.
Cheap Chinese caps, one soldered in the wrong polarity, wrong capacitance values, sellotape insulation on wires, bloodstains everywhere (I've washed all the PCB's).
Going well - I have recapped the PCB's, resoldered all the PCB joints, and put wires in all the griplets.
On the PSU block, there is a light blue 0.047uF ceramic capacitor grounded to the 7812 regulator heatsink - the other end, I have no idea.
Does anyone know where this connects?
It sits "flying across in open space" with the other end connected to the analogue board.
Martin
By analogue, do I presume correctly that you mean the Decoding PCB, with the 2 NE5532 op-amps?
Connected exactly at which point on the underside of the Decoding PCB?
It's obviously a decoupling cap.
Hi Menahem,
I found an old picture in my archives that show the capacitor in question.
John
Thank you so much!
That is the decoupling for the audio ground signal.
Project complete.
Calibration as shown 1V p-p, and 540mV Laser Current.
A real *** to connect to the test points with the machine assembled!
It plays pre-recorded discs excellently, but skips on home-burned CD's.
I'm just wondering whether this is normal - when this was released, there was no such thing as a CD-Writer yet.
My CDX and other CD104 based payers all read home-burned CDs perfectly Menahem. No problem at all. Even the older Sony CDP-101 and Philips CD 100 do.
Jacques