The EWI3020m's "non-volatile" memory battery is soldered directly to the main PCB, which means you have to take the whole PCB out in order to desolder and replace it. I took my newly acquired EWI3020m apart a few days ago to replace the hardwired battery with a coin-cell battery holder.
Every one of the boards are single-sided Phenolic Paper PCBs populated solely with through-hole components and even jumper wires. You can see in the pictures that even some of the ICs (the CEM3374 VCO and EPROM for example) are socketed! Certainly makes repairs a happier experience.
Here are a few pictures of the disassembly and the main PCB itself; apologies for not having a suitable scanner!
Main PCB Images
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| EWI3020m Main PCB |
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| EWI3020m Main PCB (traces) |
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| Composited view of the component-side and trace side |
Re-Assembled with Battery Holder Installed
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| Coloured wires are the "instrument in" cable |
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| "Instrument In" connection to the I/O PCB |
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ReplyDeleteSolder is essentially the metal alloy material wrapped around a cylinder that’s used alongside the soldering iron to establish a connection between electronic components. Know more about Raspberry Pi.
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