Found this for the IC107: https://www.ebay.co.uk/itm/M5220L-O...0ff820e:g:j6gAAOxy2CZTXk93&afsrc=1&rmvSB=true thoughts on better sources ?
NZX13A is out of stock - will this work: 771-NZX13B,133 it's 13.1V instead of 12.9V and about the IC107 - how likely is it hosed, could it be just the diode ?
going to hit local Fry's to see if I get lucky - what's my room in terms of parameters? Vz > 12.9V Pd 1/2W or more Current 100nA Impedance 35Ohms ?
Lets measure all the voltages of IC107.. 1.14.4v 2. 3.4v 3. 5.9v 4. 5.9v 5 -14.4 6. -6.0v 7. -6.0v 8. -4.0v 9. 14.4v
with new Zeners (D131/132: NTE5025A 16v, D129/130: NTE5012A 6.0v, D133/134 NTE5022A 13v) 1. -21.3v [output 1] 2. 4.2v [Inverted input1] 3. -5.9v [non-inverted input 1] 4. -5.9v [(-) power supply] 5. 5.9v [non-inverted input 2] 6. 5.9v [inverted input 2] 7. 4.1v [output 2] 8. 13.22v [(+) power supply]
The pin configuration on the M5220L spec sheet doesn't match the Yamaha schematic. Is a M5220L actually installed in the Yamaha? Craig