Finally, after endless months of development Revision C of the new Microprocessor Board is running inside the machine to control the tape and the CD-Player. Let’s not talk about Revision B since it still had some faults. However, it has been a long way and took many fails and expenses to come this far. Some days ago, for instance, I […]
Category: μ-Proc Panel
New MicroController Board Rev.C running inside the CD555
After a while there has been some progress regarding the new Micro-Controller Board. Let’s skip Revision B since it still had some issues and move forward to revision C. This revision finally made it inside the SoundMachine. Everything fits and is working although I have to change the position of connectors for easier assembly. It is not possible to get […]
Started with the development of a new uProc board
Well it has been a while since my last post. I have been off for a couple of months due to rehabilitation on burnout and now very slowly trying to get back to life… but that is another story. But let me introduce you to my latest project… After a successful reverse engineering of the CDM2 controller protocol and the […]
Soundmachine right from hell
Warning! Repair this sound machine could drive you crazy. That’s a label Philips should have put at the rear side. Everything was working on Sander’s CD555 when I powered it up for another test. And goes what… the CD-Player was not working anymore. The LCD display lighted up as on Christmas Eve and was not reacting on any keys. This […]
A digital tape counter? Aye, a digital tape counter!
I recently recorded a tape and had to rewind and then to go back to the previous position. With the analog counter that was quite a challenge. Thus I thought by myself it would be great to set a marker and go back and forward to the desired positions. And to see minutes and seconds would be even better. Well,just […]
Fixing the microcontroller board
It was time to fix the microcontroller board. Since the display sometimes showed the correct segments it was clear that the serial bus of the CPU is working and the CPU itself might be ok. There can always be a toasted input/output but I have never seen such a failure. It was obvious that the CPU sends a command to […]
Modification of cassette CPU Rev.B is working
What looks like an absolute mayhem has a structure in it – working on revision B of the modified tape deck CPU. In the new PCB the BC858B do have now the correct orientation. I replaced the 1N4001 with faster BVY27/200 and removed the inverter which should have prepared the clock for the CD-CPU. Unfortunately this was not working. As […]
Another video explaining the differences of the new tape deck controller
Better than describing a function is to show it. And here is a short video explaining the implementation of the new tape deck CPU and the firmware… https://youtu.be/vzf9zgwYRe8
Unit 2 finished (for the moment)
Finally unit 2 is finished – or at least for the moment… What was done? All capacitors replaced with new Nichicon and Elna Audio. A list of all capacitors inclusive part numbers for mouser.com is available in the download section Every panel got repaired and working fine. Still one segment on the LCD at the CD-player lights up The tape […]
Last problems for unit 2 solved
The last days I was working on the final source code for the tape deck CPU whilst I noticed another problem – it was not possible to read the states of the write protection of side A & B and the event when the CD ends was not fired. It took a while and I had to dismantle the machine […]