I have an older model NAD C542 that I have changed the optics/ribbon cable and it's back working again. The issue I am seeing is that the temps on the caps and I believe transistors are running at temps over 125*F. I believe they are part of the PS? Is this normal when a disc is being played? Perhaps I should change out these caps and transistors? Any help would be appreciated! Thanks 🙂
Transistors either work or they don't. They are designed to work up to 70°C so not a problem but check the solder joints on the pcb with the larger transistors. Dry joints and intermittant faults arrise from bad solder joints.
Capacitors should run fairly cool so after resoldering the power/regulator transistor, think about any capacitors that are swollen or have shrunk plastic sleeves. Don't adjust the laser presets unless you have a laser power meter and the nescassary test discs.
Always use the same value capacitors.
Capacitors should run fairly cool so after resoldering the power/regulator transistor, think about any capacitors that are swollen or have shrunk plastic sleeves. Don't adjust the laser presets unless you have a laser power meter and the nescassary test discs.
Always use the same value capacitors.
I was concerned that perhaps the caps may be starting to go south? The other caps on the pcb seem to be running much cooler, like around 78*F. I'm just wondering if the caps that are running hotter could cause other issues with the laser mechanism such as not being able to funtion correctly. The reason I say this is once I had installed the new laser/optic mechanism, it would play just fine for a while, then after being off for a few days, I would try and play some discs again but it would not read them. Just the tray would open and close..lol To be honest, I did try and adjust what looks like a potentiometer on the laser section, due to it not playing discs. I thought that could be the issue as to why it wasn't playing discs. Guess I was wrong. Should I turn it back to where it was when I received it? I'd have to go back counter clockwise to put it in the original position.