Brad Lehmann
Member
I messed around and picked two KR-5600 receivers last week. One is pristine and seems to work fine so I haven't messed with it. I just hooked up some speakers and have been letting it entertain me while I try to figure the other one out. The problem unit has neither AM or FM. The pointer light comes on, but nothing happens when running the tuner through the frequencies. I did notice that moving the selector into phono gets a nice hiss from the speakers, so I have started checking to see if the tuner board is getting any power. It appears that the transformer is good. Voltage reading are post 13 -39.2 post 12 +39.2 post 10 +6.8. Going to the output side of the regulator is where things go bonkers post 4 -19.6 post 3 +36.4 , 16 0, 15 0 post 5 +3.43 and post 11 8.63.. So, it looks like I have a problem that I need to fix prior to that point. I've never trouble shot any solid state components before and I'm pretty lost. Most all of my work has been done on 480 volt motor control centers (in the middle of the night to get the broken down plant running) so I'm not totally a newbie to circuits, relays, etc., just no solid state work. Any pointers on procedures to test components or suggestions for some good reading material would really be appreciated. By the way, newbie to the site and this is my first post.