Yamaha C-60 Woofer Pumping Problem

[kermit_xc]

Found this for the IC107: https://www.ebay.co.uk/itm/M5220L-O...0ff820e:g:j6gAAOxy2CZTXk93&afsrc=1&rmvSB=true

thoughts on better sources ?

 

[avionic]

HZ12-B2--exact replacement---> 771-NZX13A-133

Mouser part number for D133

 

[avionic]

Found this for the IC107: https://www.ebay.co.uk/itm/M5220L-O...0ff820e:g:j6gAAOxy2CZTXk93&afsrc=1&rmvSB=true

thoughts on better sources ?

I don't know... Good chance of it being fake.

 

[kermit_xc]

Mouser part number for D133

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 ?

 

[avionic]

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 ?

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

 

[kermit_xc]

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 ?

 

[avionic]

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

 

[kermit_xc]

I think the D131 is also shot - this is HZ16-3L

 

[avionic]

Tech note: D159 500mw zener


HZ16 3L 16.3-17.1 volt 500mw
http://www.datasheetarchive.com/dlmain/Datasheets-13/DSA-248431.pdf

exact replacement
http://www.mouser.com/ProductDetail/Vishay-Semiconductors/TZX16C-TR/?qs=sGAEpiMZZMtQ8nqTKtFS/C7KvLOwmmQCVxUUvdHB2Uo=

I think the D131 is also shot - this is HZ16-3L

 

[kermit_xc]

Now ... am I doing this very wrong by testing the diodes in circuit ?

 

[avionic]

HZ6C1L-- exact replacement ---> 771-NZX6V28.133 (Mouser P/N)

might as well..

Now ... am I doing this very wrong by testing the diodes in circuit ?

In circuit is misleading.

 

[avionic]

Those that tested bad you need to verify out of circuit.

 

[kermit_xc]

D133 is good out of circuit

 

[kermit_xc]

and so are D129 and D131 - IC107 next ?

 

[avionic]

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

 

[kermit_xc]

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]

 

[llwhtt]

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

Craig

 

[avionic]

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...

 

[avionic]

Is a M5220L actually installed in the Yamaha?

Yes it is...I just got done verifying it on a parts unit I have not cannabized yet.

 

[avionic]

Everything about that IC on the schematic is FU.