fucanay
Well-known member
Hey gang,
I have a fairly beat up MC1604 console that I got for free a while back and I want to make some changes to it. Some of the channels don't work, some crackle. I figure that a big part of what is going on is that it needs to be recapped. So that is where I plan to start. But there are some other things I'd like to do over time and could use some advice.
Here is the list:
1. replace the caps for 4 channels (each PCB contains 4 channels, with a total of 4 PCBs for input in the console).
2. replace the IC's for the same 4 channels (NJM4558DV chips, 8 chips on 1 board, looks like each set of two input channels share 4 chips. see schem.) I've read that I may have Power Supply limitations for using the 5532, so I'll post the schem for the PSU too.
3. convert 8 channels to direct outs. If I can do this I would like to use the insert connectors on the back for the outs, but they seems to be attached to another PCB, so I'm not sure if it's possible. (currently all channels have to be routed to the busses for output.)
Here are the schematics. I scanned them at high res, so the files are rather large.
Channel Schem: http://fucanay.fischerworks.com/schems/Channels.gif (1.9MB)
PSU Schem: http://fucanay.fischerworks.com/schems/psu.gif (1.5MB)
Please ask any questions, I will do my best to answer them, or learn what I need to, to answer them.
EDIT: I just discovered that this has transistors as well, 2SA970's, 2SC2320's, and 2SA999's. Are these parts that can be improved/changed?
EDIT #2: If you want to see photos of the actual channel board, look here: http://fucanay.fischerworks.com/pictures/mc1604/ .
Thanks
Matt
I have a fairly beat up MC1604 console that I got for free a while back and I want to make some changes to it. Some of the channels don't work, some crackle. I figure that a big part of what is going on is that it needs to be recapped. So that is where I plan to start. But there are some other things I'd like to do over time and could use some advice.
Here is the list:
1. replace the caps for 4 channels (each PCB contains 4 channels, with a total of 4 PCBs for input in the console).
2. replace the IC's for the same 4 channels (NJM4558DV chips, 8 chips on 1 board, looks like each set of two input channels share 4 chips. see schem.) I've read that I may have Power Supply limitations for using the 5532, so I'll post the schem for the PSU too.
3. convert 8 channels to direct outs. If I can do this I would like to use the insert connectors on the back for the outs, but they seems to be attached to another PCB, so I'm not sure if it's possible. (currently all channels have to be routed to the busses for output.)
Here are the schematics. I scanned them at high res, so the files are rather large.
Channel Schem: http://fucanay.fischerworks.com/schems/Channels.gif (1.9MB)
PSU Schem: http://fucanay.fischerworks.com/schems/psu.gif (1.5MB)
Please ask any questions, I will do my best to answer them, or learn what I need to, to answer them.
EDIT: I just discovered that this has transistors as well, 2SA970's, 2SC2320's, and 2SA999's. Are these parts that can be improved/changed?
EDIT #2: If you want to see photos of the actual channel board, look here: http://fucanay.fischerworks.com/pictures/mc1604/ .
Thanks
Matt