After the uProc and the CD-Player keys are working it was time to have a look at the CDM2. A short test revealed that it was not able to read the TOC or to play tracks. I sometimes had the problem that the TOC failed to read but it was possible to play some tracks. Mostly above certain track the […]
Month: November 2020
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 […]
Progress at unit #3
During the last days I made some progress on unit #3. Writing posts and cut videos takes some time and is way behind – what I can tell is that unit #3 is already fully working. In this episode I show and explain the power supply panel. The panel gets very excited if you replace the capacitors. In case you […]
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 […]