Good coverage on a failure pattern due to bad design causing heat related component damage. If the wattage rating of a replacement zener diode couldn't be increased due to size limitations, I'd think about relocating them with some lead wires and maybe a terminal strip to a spot they wouldn't overheat anything near, OR, It looks like a newer version on a schematic I found online has a TIP31/TIP32 transistor(s) ( with 3 additional resistors) "pre-regulating" voltage before it gets to the VR101/102 regulators that may reduce heat. Good catch on the main electrolytic filter caps as well. 30+ years ago, larger electrolytics may have been rated and marked with "WVDC" so, a 50 "working" volts DC rating would be the expected operating voltage, but running a modern 50VDC "max rated" cap that close to, or over it's rated max voltage is going to seriously decrease it's service life and invite disaster as well. Good info in the video, thank you for sharing it
I have a PSX-R that was working fine last week, I unplugged it for a few days and now it is blowing the fuse in the transformer it is connected to. I am in Taiwan which is 110v and the PSX is 240v hence the transformer. I think I might have to send it back to Cyrus in Hong Kong to get it fixed...it's just strange that it stopped working all of a sudden.
The inverted board design doesn't help the heat dissipation issues. usually heat would rise from the components into the open space inside the case. With Cyrus the heat hits the pcb....
Lol, I’m sure I’ve seen a Cyrus promotional video discussing the heat management benefits by inverting the PCB in the case! I wonder if they are still doing this with their current products.
I wonder if supply the amp with AC could be a better choice than DC I mean keeping just the mains Transformers in a separate chassis and provide unregulated AC to the amp
By regulating the voltage to the amplifier output transistors. In traditional amps, designers use huge capacitors and transformers to lessen the drop in voltage during music transients.
Nice to see a version 1 pcb being repaired, i wonder if it was worth changing the bulk capacitors?
Good coverage on a failure pattern due to bad design causing heat related component damage. If the wattage rating of a replacement zener diode couldn't be increased due to size limitations, I'd think about relocating them with some lead wires and maybe a terminal strip to a spot they wouldn't overheat anything near, OR, It looks like a newer version on a schematic I found online has a TIP31/TIP32 transistor(s) ( with 3 additional resistors) "pre-regulating" voltage before it gets to the VR101/102 regulators that may reduce heat. Good catch on the main electrolytic filter caps as well. 30+ years ago, larger electrolytics may have been rated and marked with "WVDC" so, a 50 "working" volts DC rating would be the expected operating voltage, but running a modern 50VDC "max rated" cap that close to, or over it's rated max voltage is going to seriously decrease it's service life and invite disaster as well. Good info in the video, thank you for sharing it
I have a PSX-R that was working fine last week, I unplugged it for a few days and now it is blowing the fuse in the transformer it is connected to. I am in Taiwan which is 110v and the PSX is 240v hence the transformer. I think I might have to send it back to Cyrus in Hong Kong to get it fixed...it's just strange that it stopped working all of a sudden.
The inverted board design doesn't help the heat dissipation issues. usually heat would rise from the components into the open space inside the case. With Cyrus the heat hits the pcb....
Lol, I’m sure I’ve seen a Cyrus promotional video discussing the heat management benefits by inverting the PCB in the case! I wonder if they are still doing this with their current products.
Excellent video
I wonder if supply the amp with AC could be a better choice than DC
I mean keeping just the mains Transformers in a separate chassis and provide unregulated AC to the amp
How would the psxr improve the sound of an integrated amplifier ?.
By regulating the voltage to the amplifier output transistors. In traditional amps, designers use huge capacitors and transformers to lessen the drop in voltage during music transients.
Hi,
Is it possible to use psx-r with my own diy amp? What are the 5 wires of psx-r each for?
Does psx-r connect to the amp power rail in parallel?
My psx-r isn't going back into standby. Any idea what this could be ?
Could be any number of reasons for that I'm afraid.
Shakes head at some of the design choices.
Hey, what's the maximum + -35V voltage difference? My psx-r have +34.4V and - 36V.
Its down to the regulator tolerance and the tolerance of some resistors. regulator alone is +-5% giving 33.25-36.75v - pretty crusty...
@@myalbatech So it is possible to use some potentiometers instead of resistors and fine-tune the voltage.
That would be possible though a better approach would be to use a higher precision reference. I might look at this in a future video.
Hi, have you got any videos of repairing a Cyrus cd player. There is plenty broken ones out there.