04-18-2026, 02:08 PM
First, I want to thank all those who have tried to help a beginner like me asking such elementary questions related to the 37-620 I was working on. Special thanks to morzh for identifying that 10 Ohm resistor. After doing more research, I discovered it was a 37-620CS code 124 not 125.. I found a service bulletin 250 for that model which lists the differences between it and code 121 receivers and that stated putting in the 10 ohm resistor in series with the positive of the electrolytic 18 . That bulletin also gave updated part numbers for the electrolytics which my unit has.
Now I have gone back working on the 37-640 that I originally started with before the 620 Perhaps someone gave me help with this problem. After recapping and putting the chassis back together, a wire had broken off and I can not determine where it goes . I am following the great drawing that Ron Ramirez had prepared. The wire in question is number 5 which shows to be green on his drawing that connects to the terminal where part #45 connects. I have attached a photo of that drawing. Can someone help me determine where the other end of that wire should go? I am also attaching a copy of the schematic I have for the 37-640. Thanks again to all who have helped me.
Now I have gone back working on the 37-640 that I originally started with before the 620 Perhaps someone gave me help with this problem. After recapping and putting the chassis back together, a wire had broken off and I can not determine where it goes . I am following the great drawing that Ron Ramirez had prepared. The wire in question is number 5 which shows to be green on his drawing that connects to the terminal where part #45 connects. I have attached a photo of that drawing. Can someone help me determine where the other end of that wire should go? I am also attaching a copy of the schematic I have for the 37-640. Thanks again to all who have helped me.




