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08-19-2009, 10:16 AM
Installed the new opamps on my FW-1884. Tried to sleep, but couldn't (as usual), so I got up and figured I'd do the job. It took about 45 minutes to disassemble, maybe 20-30 to put it back together, about 30 minutes to remove the old ones, and another 45 minutes to install the new ones.
The old ones were 8 pin SIL (Single In Line Package) and the new ones were 8 pin DIP (dual inline package, most integrated circuits use the dual configuration). These require an adapter and I installed sockets on the adapters in case of future chip failures.
These sound 200% better than the cheap ones Tascam puts in at the factory (JRC NJM4580). I was having some problems with noise from my SY77, and it is now almost completely gone. DAMN! These sound great.
One problem. I either made a mistake soldering on chs 5 & 6, or that particular opamp is defective. I ordered an extra one just in case, so I am going to pop that one in and see what happens, AFTER I check my soldering again.
BIG job. Lots of tiny parts, screws and ribbon cables. This is not a job for someone with a poor memory, unless you're willing to take pictures and document every step. Fortunately, I like to test myself from time to time on jobs that I am completely unfamiliar with. 100% on the reassembly - everything worked the first time (aside from the issue on 5 & 6), no extra parts. The nice part is now this is a piece of cake for me. I am quite familiar with the mechanical and electrical layout of the boards, so it will take much less time to check chs 5 & 6, as I don't have to remove quite as many parts.
The old ones were 8 pin SIL (Single In Line Package) and the new ones were 8 pin DIP (dual inline package, most integrated circuits use the dual configuration). These require an adapter and I installed sockets on the adapters in case of future chip failures.
These sound 200% better than the cheap ones Tascam puts in at the factory (JRC NJM4580). I was having some problems with noise from my SY77, and it is now almost completely gone. DAMN! These sound great.
One problem. I either made a mistake soldering on chs 5 & 6, or that particular opamp is defective. I ordered an extra one just in case, so I am going to pop that one in and see what happens, AFTER I check my soldering again.
BIG job. Lots of tiny parts, screws and ribbon cables. This is not a job for someone with a poor memory, unless you're willing to take pictures and document every step. Fortunately, I like to test myself from time to time on jobs that I am completely unfamiliar with. 100% on the reassembly - everything worked the first time (aside from the issue on 5 & 6), no extra parts. The nice part is now this is a piece of cake for me. I am quite familiar with the mechanical and electrical layout of the boards, so it will take much less time to check chs 5 & 6, as I don't have to remove quite as many parts.