This is list of 4000-series CMOS chips that should be replaced on the five circuit boards that mount to the bottom of the enclosure, underneath the keyboard assembly in the Yamaha CS-80. Base part number refers to the 40xx number of the part. Various manufacturers will prepend and append different addtionals letters or numbers. Example: base number 4001 is the generic part number. Motorola part number: MC14001B RCA/Harris/Intersil: CD4001BCN Only the base number is essential when ordering parts. Simply verify the vendor part number to match the base number and functional description. Refdes is the lists is the 'reference designator' for a given part on a board. A refdes is printed on the board and for chips takes the form of 'ICnn' where nn is a number, starting with 1 and incrementing for each additional chip. The refdes is used to indicate which mounting area is for which part. Parts may be ordered from these and other suppliers: http://www.jameco.com/ http://www.hosfelt.com/ http://www.digikey.com/ *** Board 1: KAS Key Assigner PCB 10 parts are 4000-series: qty. base part# refdes pkg. type Functional description --------------------------------------------------------------------- 4 4016 IC9 DIP-14 Quad analog SPST switch IC10 " IC11 " IC12 " 4 4050 IC4 DIP-16 Hex non-inverting buffer IC5 " IC7 " IC8 " 2 4069 IC6 DIP-14 Hex unbuffered inverter IC23 --------------------------------------------------------------------- (Six 14-pin sockets, four 16-pin sockets) *** Board 2: SH Sample/Hold PCB 4 parts are 4000-series qty. base part# refdes pkg. type Functional description --------------------------------------------------------------------- 2 4011 IC1 DIP-14 Quad 2-input NAND gate IC3 " 2 4016 IC2 DIP-14 Quad analog SPST switch IC4 " --------------------------------------------------------------------- (Four 14-pin sockets) *** Board 3: TKC Polyphonic Touch Assigner PCB 28 parts are 4000-series NOTE: IC16, IC17 do not exist on TKC PCB, thus the gap in refdes. qty. base part# refdes pkg. type Functional description ----------------------------------------------------------------------- 3 4011 IC11 DIP-14 Quad 2-input NAND gate IC12 " IC13 " 5 4013 IC3 DIP-14 Dual D-type flip/flop IC4 " IC5 " IC6 " IC19 " 1 4015 IC18 DIP-16 Dual 4-bit static shift reg 5 4016 IC23 DIP-14 Quad analog SPST switch IC24 " IC25 " IC26 " IC27 " 2 4019 IC1 DIP-16 Quad AND-OR select gate IC2 " 1 4081 IC7 DIP-14 Quad 2-input AND gate 5 4069 IC8 DIP-14 Hex unbuffered inverter IC9 " IC10 " IC29 " IC30 " 1 4071 IC20 DIP-14 Quad 2-input OR gate 5 4073 IC14 DIP-14 Triple 3-input AND gate IC15 " IC21 " IC22 " IC28 " --------------------------------------------------------------------- (Twenty-five 14-pin sockets, three 16-pin sockets) *** Board 4: TSB1 touch input amplifier/multiplexer PCB 5 parts are 4000-series qty. base part# refdes pkg. type functional description --------------------------------------------------------------------- 5 4051 IC1 DIP-16 8:1 analog mux/demux IC2 " IC3 " IC4 " IC5 " --------------------------------------------------------------------- (Five 16-pin sockets) *** Board 5: TSB2 touch input amplifier/multiplexer PCB 5 parts are 4000-series qty. base part# refdes pkg. type functional description --------------------------------------------------------------------- 5 4051 IC1 DIP-16 8:1 analog mux/demux IC2 " IC3 " IC4 " IC5 " --------------------------------------------------------------------- (Five 16-pin sockets) *** For all five boards, here is an aggregate list of the 4000-series chips. qty. base part# functional description --------------------------------------------------------------------- 5 4011 Quad 2-input NAND gate 5 4013 Dual D-type flip/flop 1 4015 Dual 4-bit static shift register 11 4016 Quad SPST analog bilateral switch 2 4019 Quad AND-OR select gate 1 4081 Quad 2-iput AND gate 4 4050 Hex non-inverting high-voltage buffer 10 4051 8:1 analog multiplexer/demultiplexer 7 4069 Hex unbuffered inverter 1 4071 Quad 2-input OR gate 5 4073 Triple 3-input AND gate === 52 chips total for "lower five" CS-80 boards. 35 of the 14-pin sockets needed. (Mill-max# 110-93-314-41-801000) 17 of the 16-pin sockets needed. (Mill-max# 110-93-316-41-801000) --------------------------------------------------------------------- /**/