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sansui 5050 rebuild

B

benshi

New Member
hello sansui frinds

my name is benshi
i bought rebuild kit from ebay from: Affinity For Artifacts store.
in the rebuild kit was parts for: tuner, power supply, driver board, main cap, phono, preamp board.
i get all the parts and install them one by one with the instructions.
after every step i checked by dim bulb to see if everything is ok, and it goes well.
after i finish the protect i adjust the new trimmers to 7.5 mv on the front side and 10 mv on the trimmer of the back side,
i let it run on fm on normal volume and it's stays cool :thumbsup:
so i continued and connect my computer to aux and the sound is not sound good at all......
i need help to finger out in witch board it could be
it not sounds good also in all other channels
i uploaded a vido here that you can see what i'm talking about
i need your help
every information can help my start figure it out

this is the video

yours benshi
 
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Welcome to AK, hopefully we can get you sorted.
Your video link doesn't work.

Checked your kit, Affinity (AK member @EastPoint ) knows 5050s.

Does the TUNER sound bad as well?
Sure you got the replacement KSC1845/KSA992 pinouts correct?
 
With TUNER selected was the audio clear/good?
benshi said:
i let it run on fm on normal volume and it's stays cool
Click to expand...
Above suggests yes, Tuner ok.

The preamp and power amp are common to all sources/inputs so no fault there. More likely you have a dirty input selector or an issue with the RCA connectors. Try connecting your laptop/focusrite to the TAPE play RCA's. Also inspect the AUX RCA's for bad solder connections etc. Did you clean the input selector?
 
mbz said:
With TUNER selected was the audio clear/good?

Above suggests yes, Tuner ok.

The preamp and power amp are common to all sources/inputs so no fault there. More likely you have a dirty input selector or an issue with the RCA connectors. Try connecting your laptop/focusrite to the TAPE play RCA's. Also inspect the AUX RCA's for bad solder connections etc. Did you clean the input selector?
Click to expand...
its sound bad in tape also.. the rca was ok before i did the project
 
benshi said:
the rca was ok before i did the project
Click to expand...
If audio was clear before you started the project then possibly you have inserted a transistor with incorrect orientation.
Check orientation of all replaced transistors against the transistor datasheet.

Don't recall if the 5050 has pre-out/main in RCA's at rear
edit no pre-out/main ims on the 5050
 
Last edited:
hi again
i have another questions
in the instruction is said that on the power supply board(i have f2701 board)
"in r610/r611 you will either see two small resistors or two large resistors there, if you have small resistors (the same size as the 6.8 ohm that you replace) check the board underside and you'll probably see two more small resistors there if you have large resistor, you can leave these alone. if you have small ones on boat sides, remove all of these, then replace the ones on the top with the new 2.2 ohm resistors. you don't need to replace the bottom ones, just to remove them"

in my board in r610/r611 i think that i have small resistors( it's look the same size as the 6.8 that i replaced) and in the backside i don't have resisters at all in r610/r611

someone can help me to understand what to do here?

i have left 2 - 2.2ohm resistors that i don't understand what to do with them
 
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