Some of you may remember my previous postings about my Sharp VZ-3000 'both sides play linear tracking' record player boombox. I know it's not a portable unit but it still received a warm welcome here when I initially posted it so now I'm back !
Some months ago, I decided to sell the VZ because it was getting frustrating trying to work on it. A local guy bought it off me and I carried on with other stuff. Recently however, I.ve been getting more into component level repairs and learning how to solder and use an oscilloscope. I began wishing I had kept the VZ because now I may be in a better position to fix it.
Fast forward to today and it is back in my possession, exactly as it left me. The guy who bought it contacted me recently to ask if I might want it back - he took it to his work to have a look at it but got busy and never did anything with it. I said sure, I would take it back as long as it was complete. He said it was and that he thinks he traced the fault with the sound output to an issue in the EQ board. He also told me the speakers needed refoaming - I never looked at them myself.
So here we are, the VZ is still mostly stripped down to the bare chassis. The PSU is fitted, main control board, tape deck / board and tuner are all connected. My plan is to inject a 1Khz tone through the AUX input and attempt to trace that through the unit using my scope until I find the point where it cuts out. This will be my first attempt to actually use a scope to trace out a fault so I will keep this thread updated with my progress......