I recently purchased a 2002 Yamaha P-80 digital piano with a broken PCB for which I cannot find a replacement. I'm looking for help on re-creating the PCB and components list to make a functional replacement. I've recreated to the schematic I believe and had some questions about the board and components design before I get too far into things. I'm not a complete noob to PCB's but I've mostly followed guides to this point and lack my own knowledge, so I need some help. Any help is absolutely appreciated.
The current PCB has several fractures that affect the audio portion so it powers up but no audio is generated. I had the left channel working working for a moment with my hackjob wiring but it went out again when I moved the board and expanded the cracks, oops. I need to try to rewire the NJM2073D chip as that's on dicey connections and very well may be the culprit currently but for the long term fix I want to create a whole new replacement PCB.
The board in question is the Yamaha P-80 M Board. I've linked relevant images below: Service manual schematic, layout and parts list as well as my own Kicad schematic and photos of the board currently.
SM Schematic
SM Layout
SM Parts List
Kicad Schematic
Top side of broken PCB
Underside of broken PCB
Questions/thoughts:
1. Does my schematic seem to be accurate according to the original? It looks good to me but I don't trust myself alone.
2. There's a few visually thicker traces on the original schematic. Pins 2 & 4 from CN1, Pin 5 on CN3, COM on IC2 and the lines with a gap between GNDA and GNDD under IC2. What does this signify?
3. Related to above, there's a connected line between AGND and DGND near IC2, most of it thick with just a little bit thin in the center. On the board itself there is no continuity between the two GND's. What's the deal with that? I feel like there shouldn't be a line between the two at all but it must be there for a reason.
4. The original schematic specifies different capacitor types on the bottom left, including Semiconductive Capactiors. The caps on the board that are labeled semiconductive are ceramic disc caps. Do I need to worry about the Semiconductive label and get a certain type of cap?
5. There's a label of '1mA' near R9 and R19. What does that mean? Is that the load they see?
6. Everything on the original PCB are Through-Hole components. Is there any reason I couldn't go Surface Mount for any components that come in SM format to make the new board a little cleaner? I much prefer SM.
Thank you in advance for any help!
The current PCB has several fractures that affect the audio portion so it powers up but no audio is generated. I had the left channel working working for a moment with my hackjob wiring but it went out again when I moved the board and expanded the cracks, oops. I need to try to rewire the NJM2073D chip as that's on dicey connections and very well may be the culprit currently but for the long term fix I want to create a whole new replacement PCB.
The board in question is the Yamaha P-80 M Board. I've linked relevant images below: Service manual schematic, layout and parts list as well as my own Kicad schematic and photos of the board currently.
SM Schematic
SM Layout
SM Parts List
Kicad Schematic
Top side of broken PCB
Underside of broken PCB
Questions/thoughts:
1. Does my schematic seem to be accurate according to the original? It looks good to me but I don't trust myself alone.
2. There's a few visually thicker traces on the original schematic. Pins 2 & 4 from CN1, Pin 5 on CN3, COM on IC2 and the lines with a gap between GNDA and GNDD under IC2. What does this signify?
3. Related to above, there's a connected line between AGND and DGND near IC2, most of it thick with just a little bit thin in the center. On the board itself there is no continuity between the two GND's. What's the deal with that? I feel like there shouldn't be a line between the two at all but it must be there for a reason.
4. The original schematic specifies different capacitor types on the bottom left, including Semiconductive Capactiors. The caps on the board that are labeled semiconductive are ceramic disc caps. Do I need to worry about the Semiconductive label and get a certain type of cap?
5. There's a label of '1mA' near R9 and R19. What does that mean? Is that the load they see?
6. Everything on the original PCB are Through-Hole components. Is there any reason I couldn't go Surface Mount for any components that come in SM format to make the new board a little cleaner? I much prefer SM.
Thank you in advance for any help!