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Old 20th Nov 2011, 11:30 am   #8
geofy
Retired Dormant Member
 
Join Date: Jun 2006
Posts: 1,798
Post Re: Roberts R200 schematic

Quote:
Originally Posted by G4GNU Andy View Post
Have purchased the service sheet and have reconnected all wires. Sort of works when I hold the ferrite aerial. At least the audio side is fine! Thanks for your help, much appreciated.
If there is a radio signal when the ferrite is held, it could be a coupling capacitor or the tuner has not been connected correctly, holding the aerial is making a capacitive coupling.

Quote:
Originally Posted by Neil Purling View Post
How do you get on locating component positions on the print side of the PCB to remove them. I don't know if Newnes has the component positions marked onto a diagram of the PCB tracks for the three versions or not.
If there are any spare holes in the board, put a bit of single strand wire though the hole, it gives some idea of where the top of the board is in relation to the other side. Then look at the transistor and figure out where the leads are attached to the printed side, it shouldn’t be to difficult. Find the connections to the output transformer as the leads will be close to this.
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