4seatPilot
"Broker"
You are welcome!
10 ohm,1/2 watt, check. Should be just fine
sent from the 2nd galaxy with tapatalk
10 ohm,1/2 watt, check. Should be just fine
sent from the 2nd galaxy with tapatalk
ServiceBulletinMods
- Thread starter merrylander
- Start date
keithpgdrb
Super Member
sorry to be such a Q&A guy. I really need to learn when to use film, metal film, wire wound, ceramic, electrolytic, etc... That stuff is beyond me right now.
thanks again.
thanks again.
fernarias
Super Member
Power rating determines type since I don't think they make a 3.5 watt metal film resistor.
This brings back memories as the CR 2020 was my first recap. I love the sound but they are hard to work on (compared to some other brands I've worked on). I still have to recap my friends 2020.
4seatPilot
"Broker"
To a point, different types are used for various power ratings... but then there are lots of options in the <1w category... it's a preference thing mostly I think.
2020 hard to work on?? Maybe a bit... it's not an 820, that's true. But I'll take a 1020/2020 over a Pioneer SX3800 any day of the week. Once you get a few key parts out of the 2020, it's really not that bad.
keithpgdrb
Super Member
ok, broken trace on the circuit board. came right off with now forcing. wtf.. so, how to fix it? run wire from point to point, or solder it by the old trace? and try to connect?
keithpgdrb
Super Member
I picked up the 10ohm resistor you mentioned, but isnt it supposed to be 22ohm?
fernarias
Super Member
Here's my fix.
http://www.audiokarma.org/forums/showthread.php?t=414955
See it was difficult for my first recap.
keithpgdrb
Super Member
I cant find anything about a broken trace?
4seatPilot
"Broker"
He made a whole new pcb.
Use the tails of the new parts to make connections where the trace is gone, or small pieces of wire.
sent from the 2nd galaxy with tapatalk
Use the tails of the new parts to make connections where the trace is gone, or small pieces of wire.
sent from the 2nd galaxy with tapatalk
keithpgdrb
Super Member
Thanks man. I ended up using a small segment of hookup wire to connect the two points. multimeter says their connected. cross my fingers on that one.
so, the 10ohm resistor is ok, even though the original white one was a 22ohm like the others?
keithpgdrb
Super Member
also, I dont have any thermal paste, or whatever was used behind the transistors. what can I use? only thing I have is JB Weld.
merrylander
AK Member
It is available at Radio Shack.
keithpgdrb
Super Member
Just a quick note. I was second guessing the use of the 10 ohm resistor because my 2020 had a 22ohm installed in that space. I see now that underneath the part is the board asking for a 10ohm. so, seems the wrong part has been there for a long time.
thought it was interesting.
keithpgdrb
Super Member
lol. I wasnt really considering jb weld. it was just in front of me when I was typing.
keithpgdrb
Super Member
The original transistor heatsinks were glued to the board, but they dont need to be right? It seems to me that leaving a little space at the bottom would be better for ventilation yes? Should I mount the transistors slightly off the board? hard to tell what others have done. mounting the sinks flush to the board doesnt seem smart, but there may be a reason I dont know about.
merrylander
AK Member
They were glued to the board originally, probably because glue is cheaper than TO-220 insulator kits. With no insulator the heatsinks are at opposite DC potentials, makes for lots of sparks if they touch.The ventilation was supposed to come freom all those little holes that unfortunately got mostly filled with glue.
keithpgdrb
Super Member
So should I mount them flush with the board with some kind of glue, or let them hover slightly above? I've cleared the ventilation holes, so there will be that.
If I am to glue them, what should I use? would the JB weld work here?
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merrylander
AK Member
I only ever mounted them such that the heatsink was flush with the board. A couple of time I tried the gel type cyanoacrylate (crazy) glues but it never held well.
My own CR-2020 has multi finned heat sinks that I found at Radio Shack, gives better cooling.
My own CR-2020 has multi finned heat sinks that I found at Radio Shack, gives better cooling.
stevepe
Active Member
I found that there is more room to use bigger heat sinks when new smaller caps are installed on that board. I found something appropriate at my local electronics supply. I was disappointed with RS's retail store. With stuff like this, were size matters, I don't trust my ability to choose the right one from a website.
Steve
Steve
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