Yamaha C-60 Woofer Pumping Problem

You can try the diode first. NZX13B should be close enough. Replace D134 as well with the same.

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 ?
 
Just the working Voltage and Pd--- 500mw at least.
12.4 vdc --- 12.9vdc <-------- HZ12-B2 and NZX13A
 
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
 
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]

m5220l.PNG
 
Last edited:
The pin configuration on the M5220L spec sheet doesn't match the Yamaha schematic. Is a M5220L actually installed in the Yamaha?

Craig
 
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
Disreguard... Guess what I found another typo in the schematic...:rolleyes:
 
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