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 […]
Category: Power Supply Panel
Power Supply Issue fixed
As the analysis has shown there war somewhere a cold joint which causes the break-down of the power supply for the CD-Player. It took me about 4 hours to identify that resistor 3490 from time to time failed to do its job. Such things causes grey hairs… The problem with the power supply panel is the heavy transformer. It bends […]
Unit #4 mainly working
I am getting faster with every unit. There are some neuralgic points that always fail. On the power supply it is definitely the transistor 7477 which was in almost all units broken or got killed during ling time testing. On the amplifier part one TDA2030 was not working – only a buzzing noise on its output. To check it I […]
First long time run of Unit #3 failed
A better product name than Philips-CD555 would be Philips-SMFH. SMFH as abbreviation of SoundMachine From Hell. The think drove me crazy the whole day. Whilst I was playing for hours yesterday, today morning it failed. I have to admit that after some hours there machine made a silent but hearable buzz which was not in the audio line and the […]
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 […]
Power Supply Issues
A first measurement of the voltages has shown that +9V and +5V are missing because of a broken fuse (1467). After ordering some spare parts – basically trying to get every component of the PCB – I replaced the fuse 1467 and also removed the transistors 7477 and 7478 of the same supply line. Testing has shown that they are […]
Checking the power supply
The first step is to measure if the power supply is working. The time I started with the documentation of this website I have already done this step so I can explain in detail the problems and workarounds in a singe post. The power supply consists of seven main supplies. However, several boards do have additional circuits (e.g. 78xx) to […]