I fixed up a friends EX5 by installing 3 keys, a flat spring, battery and the 2 audio out jacks. It play but with only 1 acoustic piano sound. My questions are so rudimentary but I just don't know where to start. 1) Will performing the "system initialization" bring back any sounds at all? 2)The cust...

After reading your posts, think of me as a 6 year old. We have just repaired a Yamaha EX5. 3 new keys, key spring, battery and 2 audio jacks. The keyboard plays a default acoustic piano but no other sounds. The customer does not have the discs. Question 1) Will the "system Initialization" procedure ...