welcome to beoworld!
1. LEDs light for tape and fm1-3 is not working. is it hard to find repair shop to fix them or can i deal with B&O shop directly?
member: "Dillen" has the correct spec lights for these. i would suggest replacing all of them at the same time. you might also want to consider a capacitor replacement kit from him also.
2. i would like to test headphone socket but i have only 3.5mm jack headphone, can i find converter from b&o jack to 3.5mm jack? and how to call headphone jack that suit with this unit, is it 6.35mm? so that i can have a search for convertor in internet.
in the states, i sourced a 1/4 -> 1/8 adapter for a few dollars. should be available at maplins or similar in the uk.
3. As i told you above, i have no speaker yet and looking for a pair now. i dont mind to get more modern speakers to get better sound quality. the thing i wanna know is how to descripe the speaker socket, does it has a name to call? so i can find the suitable speaker or convertor if i wanna use modern speaker.
speakers are your preference, b&o or otherwise. i would recommend period s45's! regardless, you want 2 pin DIN connectors, maplins again. you will need a pair of male and females for b&o speakers, just the males for other brand... spade is negative (-) / pin is positive (+).
4. is it right that the price of b&o cartridge is around £200? does it has the similar cartridge (other brands) that is cheaper and can be fitted with beogram 1500(in case of i really need to change it)
and sometimes a lot more money! you can buy replacements from sound-smith.com in the states, or there is a german fellow now offering rebuilds -search the forum for more info, and after you determine that yours is shot.
5. last question is before i will go back to my country, i would like to send them to shop to check and clean inside to make them stay alive with meas long as they can (i am not sure that i can do by myself since i always break thing when i try to fix it.) can anyone who live in uk reccommend me the repair service that you know? it would be great if they are in london.
someone will be along soon to offer you advice on this, i am sure.