identifying key resistors on NAIM NAP110

[ricardo007]

Hello
I have a schematics of a NAP140, supposedly close to the one of the 110:
https://drive.google.com/open?id=1MjiPzPyiyPP4U3eLhajXtxZQKoDfN3JRrg

and a picture of the inners of my 110:
https://drive.google.com/open?id=0B-2wnjd4pojAdzJtV1RqQWJ2THd6cVMzWDVwczJnRUNpNUJz

On the schematics, I underlined in yellow the 5 most important resistors to upgrade (signal and feedback resistors), according to LesW of Avendale.

Could a charitable soul indicate to me on the picture of my 110 which are the 5 resistors in question???
Best regards
Richard

 

[martinab2]

I have a 110 similar to yours - will do a picture with the components highlighted once I get home. In the meantime, can you post a full size picture of just one board so that the resistor colour codes are clear. (just in case there are any differences between our boards)

Martin

 

[Pete MB&D]

You will need to remove the board to fit the resistors so you can trace the tracks back from the input connections, its just like following a map.
Its all part of the fun with electronics.

Pete

 

[ricardo007]

@Martin: thanks for your picture in advance.
The poweramp is not with me now but will try to get a more detailed picture this week end. However once I get your picture, I will have the information I need, I will just check the color codes later!

As for the change of resistors I was planning to replace those 5 by Schinkoh tantalum resistors, any feedback available?

Richard

 

[martinab2]

Picture with the resistor positions marked in the link below:

https://www.dropbox.com/s/t0whdikk9evzyvn/110.jpg?dl=0

After making any changes I would power up without the speakers connected and measure the dc offset at the output terminals. It should be 20mV or less - slightly higher won't do any damage but if it's reading in volts then switch off and find out why.