Yamaha i88x Service Manual page 45

Removed chip resistor
R161, R162, R163, R164
R172, R173, R174, R175, R176
*5
Installed jump cable
*1:R176 Left side - R164 Lower side
*2:R175 Left side - R163 Lower side
*3:R174 Left side - R162 Lower side
*4:R161 Lower side - R173 Lower side
*5:R161 Lower side - R172 Lower side
The short circuit of 4 and 5 is a thing that is individually
executed, and not executed at the same time.
(Fig.2)
i88X
45