amr2
Well-Known Member
Yes, by laser or waterjet cutting.
SoCal Sam
Lunatic Member
Dedication!
louiszimmerm
New Member
Congratulations on a superb restoration!
amr2
Well-Known Member
Acetone, applied with a brush
Synergy
New Member
I'm an EE and a great fan of Yamaha.
The PC2002M is a classical design using full complementary common-emitter push-pull output power stage. I've had one for last 20yrs now and connected to any JBLs, and a Luxman pre, the combo is unbeatable.
It developed some protection issues which I fixed, but accidentally fowled the +/-15V supply which feeds a lot of low level circuitry, including the VU meters, and one channel of meter Ic IG00137 got partially damaged.
Anyone have idea where to get the MD meter board or the Ic ?
The PC2002M is a classical design using full complementary common-emitter push-pull output power stage. I've had one for last 20yrs now and connected to any JBLs, and a Luxman pre, the combo is unbeatable.
It developed some protection issues which I fixed, but accidentally fowled the +/-15V supply which feeds a lot of low level circuitry, including the VU meters, and one channel of meter Ic IG00137 got partially damaged.
Anyone have idea where to get the MD meter board or the Ic ?
exwhyzed
Active Member
exwhyzed
Active Member
If you open up the IG00137 black box, i think its just regular through hole parts in there with two opamps. You may be able to rebuild the circuit. Check out this post regarding a similar black box, the IG00136.
Alternatively, you might be able to use an "aliexpress special" dual analog VU meter driving board in place of your black box. you'll just have to feed it the correct voltage.
Alternatively, you might be able to use an "aliexpress special" dual analog VU meter driving board in place of your black box. you'll just have to feed it the correct voltage.
exwhyzed
Active Member
How did you fix it so fast? I need those skills.
Synergy
New Member
Synergy
New Member
Actually, I spent some time detecting the problem areas. And mind its not the dc servo. Then eliminated one by one till perfect. I will post more vids n pics of while fixing it.
Synergy
New Member
And just let me know whenever you need to work on it, I will be more then glad to help you.
Here's the link to the thread on the meter board.
https://audiokarma.org/forums/index.php?threads/pc2002m-meter-board.812767/
https://audiokarma.org/forums/index.php?threads/pc2002m-meter-board.812767/
Synergy
New Member
Thanks mike, appreciate a lot !
exwhyzed
Active Member
@amr2 or anyone else, how do i release the DA board from the heatsink? I haven't worked on a unit with these types of metal can transistors that are mounted on the opposite side of the board before.
Do I unsolder the metal-spikes, that i think could be the transistors legs? If so, i can see how this will release the board. OR, are these metal spikes just the legs of sockets, and what i need to do is unscrew the transistors from the other side, which will release them from the sockets?
Do I unsolder the metal-spikes, that i think could be the transistors legs? If so, i can see how this will release the board. OR, are these metal spikes just the legs of sockets, and what i need to do is unscrew the transistors from the other side, which will release them from the sockets?