Works byt i find the led a little to dim.
Propably due to different led.
If i use a smaller resistor or remove it should be brighter?
https://elektronik-lavpris.dk/p121323/l-1413idt-4-mm-led-flad-top-roed/
Works byt i find the led a little to dim.
Propably due to different led.
If i use a smaller resistor or remove it should be brighter?
https://elektronik-lavpris.dk/p121323/l-1413idt-4-mm-led-flad-top-roed/
berp269
New Member
Hello amr2. Amazing work.....!!! 
I recently lost the heart of my HiFi, my beloved Yamaha MX-1000. As I prepare for repair, a pc2602m appeared on the way.
It is about 1,300 km from my house so it will be a blind purchase in terms of sound. In your opinion, what can I expect from this beast? Sound like the MX-1000?
I appreciate your response in advance.
I recently lost the heart of my HiFi, my beloved Yamaha MX-1000. As I prepare for repair, a pc2602m appeared on the way.
It is about 1,300 km from my house so it will be a blind purchase in terms of sound. In your opinion, what can I expect from this beast? Sound like the MX-1000?
I appreciate your response in advance.
amr2
Well-Known Member
Hello amr2. Amazing work.....!!!
I recently lost the heart of my HiFi, my beloved Yamaha MX-1000. As I prepare for repair, a pc2602m appeared on the way.
It is about 1,300 km from my house so it will be a blind purchase in terms of sound. In your opinion, what can I expect from this beast? Sound like the MX-1000?
I appreciate your response in advance.
Thank you! Sorry for the late response...
I could not compare this amp with my other stuff in full range. I use it to power a DVC 15'' subwoofer. It’s a sealed sub with a linkwitz transform to extend the low end. It needs an amp with a lot of control. This beast works very well in this scenario, it produce a very accurate bass.
Last edited:
amr2
Well-Known Member
Yes, I have it. But the blog is in Spanish :-(
I opened a thread a few years ago:
https://audiokarma.org/forums/index.php?threads/mx-1000-rebuild.743535/#post-10094080
amr2
Well-Known Member
Yes, of course.
Hello
This is an excellent job! Thank you for sharing!!
I own a PC 2602 and while recapping PS board capacitors i found out that ihave some diferrent values than the ones you are mentioning on the C 417,C418 positions.
I see 100uf 35v caps on both positions while in your list the values are 470uf 35v.
Unfortunately the service manuals' parts list is not mentioning these caps at all.
I would be gratefull if you could help me out with this.
Thank you
This is an excellent job! Thank you for sharing!!
I own a PC 2602 and while recapping PS board capacitors i found out that ihave some diferrent values than the ones you are mentioning on the C 417,C418 positions.
I see 100uf 35v caps on both positions while in your list the values are 470uf 35v.
Unfortunately the service manuals' parts list is not mentioning these caps at all.
I would be gratefull if you could help me out with this.
Thank you
allnight
New Member
Hello all.
I recently embarked upon replacing the bulbs in the power display myself. I chose the following red LED's (there's a downloadable datasheet link on the page) https://www.altronics.com.au/p/z0710-red-6mcd-3mm-through-panel-led/
I used the diagram provided by member amr2
https://audiokarma.org/forums/index.php?attachments/img_1140-jpg.881676/
however I chose to omit the variable resistor. I used all other components and values as shown along with a 1N4004 diode shown, but not specified on the diagram, and powered the string using the original 12v AC supply.
The result - well, it was the first time I'd ever seen the meter display working on my amp without using a torch - awesome - nearly perfect. I wider distribution LED would have been better, as in low light conditions there are obvious spots that reveal the light source location. But as for brightness - perfect. Visible in daylight, and not over bright or distracting in the dark of night that I and many often enjoy. Compared to other Yamaha power amps I have - M60 for example, these are slightly dimmer.
I'm keen to give the old girl a decent clean-up and overhaul now that I've become familiar with the chassis and componentry. My unit remains otherwise unmodified, although it has had some dry joint repair in it's history on both main boards.
I recently embarked upon replacing the bulbs in the power display myself. I chose the following red LED's (there's a downloadable datasheet link on the page) https://www.altronics.com.au/p/z0710-red-6mcd-3mm-through-panel-led/
I used the diagram provided by member amr2
https://audiokarma.org/forums/index.php?attachments/img_1140-jpg.881676/
however I chose to omit the variable resistor. I used all other components and values as shown along with a 1N4004 diode shown, but not specified on the diagram, and powered the string using the original 12v AC supply.
The result - well, it was the first time I'd ever seen the meter display working on my amp without using a torch - awesome - nearly perfect. I wider distribution LED would have been better, as in low light conditions there are obvious spots that reveal the light source location. But as for brightness - perfect. Visible in daylight, and not over bright or distracting in the dark of night that I and many often enjoy. Compared to other Yamaha power amps I have - M60 for example, these are slightly dimmer.
I'm keen to give the old girl a decent clean-up and overhaul now that I've become familiar with the chassis and componentry. My unit remains otherwise unmodified, although it has had some dry joint repair in it's history on both main boards.
Hi restoring this amp too.
Maybe some one has an opinion on this.
On schema and on both amplifier boards base reaistors R131 and R132 have different value. 330 ohm an 33 ohm. See attached scematic.
Normally in an amplifier I expect that these are the same. Yamaha error?
Can you please check your pc2602 on this?
Maybe some one has an opinion on this.
On schema and on both amplifier boards base reaistors R131 and R132 have different value. 330 ohm an 33 ohm. See attached scematic.
Normally in an amplifier I expect that these are the same. Yamaha error?
Can you please check your pc2602 on this?
Attachments
Welcome aboard Pm80... Posted schematic is to small to be useful.
Thanks for your answer, but thats exactly my point. On schema and on amp board these values are indeed different. I repaired a lot of amps. Normal wise these base risistors are equal to create symmetrical voltages. I suspect this is an design error.....