Anyone ever have to adjust this? I can’t seem to find one? Of course there is no service manual either...
19k stereo trim pot on Lasonic TRC920
- Thread starter baddboybill
- Start date
I had to on my M70 and both of my C100s. To do it correctly, you are supposed to hook up test equipment to a TP pin on the tuner board. I always tuned to a strong station on the tuner meter and then adjusted and centered the VR trim pot to a point where the stereo indicator light illuminates. I'd sweep CCW and find the point where the indicator went off, then sweep CW and find where the indicator went off and then place the VR trim in the middle of those two points where it was lit.
Has always worked well for me. As to the location, it varies from model to model. What are you working on baddboybill? Is it the Telefunken Studio again? We need to learn German
Just so happens I am working on a M90 at the moment. As you can see from the picture below, the 19Khz Pilot trim pot is VR1 and the TP-8 test pin is at the lower corner of the board next to the purple screw for testing. Most of the trims that adjust the pilot have looked like this but without confirmation or schematic I'd continue to research your specific model box before turning it
Has always worked well for me. As to the location, it varies from model to model. What are you working on baddboybill? Is it the Telefunken Studio again? We need to learn German
Just so happens I am working on a M90 at the moment. As you can see from the picture below, the 19Khz Pilot trim pot is VR1 and the TP-8 test pin is at the lower corner of the board next to the purple screw for testing. Most of the trims that adjust the pilot have looked like this but without confirmation or schematic I'd continue to research your specific model box before turning it
Lol my dum a$$ forgot to post it’s a lasonic trc920 that I’m working on for member here. Thank you too as usually I don’t have problem finding them.Transistorized said:I had to on my M70 and both of my C100s. To do it correctly, you are supposed to hook up test equipment to a TP pin on the tuner board. I always tuned to a strong station on the tuner meter and then adjusted and centered the VR trim pot to a point where the stereo indicator light illuminates. I'd sweep CCW and find the point where the indicator went off, then sweep CW and find where the indicator went off and then place the VR trim in the middle of those two points where it was lit.
Has always worked well for me. As to the location, it varies from model to model. What are you working on baddboybill? Is it the Telefunken Studio again? We need to learn German
Just so happens I am working on a M90 at the moment. As you can see from the picture below, the 19Khz Pilot trim pot is VR1 and the TP-8 test pin is at the lower corner of the board next to the purple screw for testing. Most of the trims that adjust the pilot have looked like this but without confirmation or schematic I'd continue to research your specific model box before turning it
20190118_144014.jpg
OK I found the trim pot which one it is and while turning it it broke of course so had to replace it with another one and now everything is working fine thank you everyone !!