Repairing a Kawai PN300 digital piano - Fixing the board faults - Part 7

Part 7
My attempt to fix a faulty Kawai PN300. It is an old Digital Piano around the year 2000, It still sounds pretty good for its age. I got the piano at a very good price due to the faults. So I tried my hand at fixing the Piano to restore the piano to its former glory.
Most of the piano worked but the faults were:
1. Some 6 keys in the last 2 octaves were not working at all i.e. 2x C, E, G#.
2. The piano also had some very soft sounding keys as well. They sounded almost muffled when hitting the key as they did not keep sustain every time but randomly played softly.
3. Some stuck keys.
4. Some keys were not level.
The fix was to replace all the disintegrating rubber and plastic pads as seen in the video. Next was to find what was causing the 6 keys to not work at all. Some corroded pads and traces were found which stopped the lower keys getting the required signal.
This 8 part series was a fun hobby fix and I hope there is some useful information in these videos that can help or guide others with similar piano problems.
Please feel free post questions below

[@gotofourths933]

Most helping video that i ever watched of a million so far.Thank you . Such a inspiring video. I have a Yamaha p-35 , no sound from G4 to C6 , I dissembled and observe the circuit , checked the connectors, there are some suspect spots on solders and some unmasked parts etc. diots seem ok but need to be checked. I made some cleaning with alcohol but no fix. The spares are available online and cost about 80 Pound + import taxes . But i try first to fix and ordered a simple multi meter to trace the circuit. I have the circuit schemes also. I'm not good on soldering and need some training first i guess . But finding the faulty path will be most important thing and make my day i think lol.

[@nerinamangano3355]

Awesome work

[@tobygilbert7699]

Thanks a lot 😊

[@mariolabs913]

Nice, the Solder had nothing to stick to so that was an ok job

[@romielfullozos53]

For me i use #32 - #40 magnet wire for jumper