Teardown: A look inside the Yamaha QY10

To prepare replacement of the battery, I did a #teardown of my #QY10, and identified some of the components inside. I show a suitable replacement battery. In a later video we'll do the actual replacement. Something new for the channel, me talking... :) Ingredients: 27C2001 1 Mbit 128Kb x8 UV EPROM and OTP EPROM Maybe this is just the firmware, as there is yet another chip in the set, which sits next to the DAC UPD43257B 256K-bit(32K-word x 8-bit) Low power SRAM This is the chip that is actually backed by the battery. YM7138 (DAC) 74HC4078 8-INPUT NOR/OR GATE 74HC02 Quad NOR Gate 74HC32 Quad OR Gate 74HC138 3 to 8 Demultiplexer 74LS14 Hex Inverting Schmitt Triggers 6N137 (MIDI optocoupler) 4556 Dual Opamp (probably for the headphones) 4558 Dual Opamp