I’m preparing to attempt a repair on an Alinco DX-70T that needs SMT diodes replaced on the Band Pass Filter boards. There are 5 boards, one for each HF band and each board has a few SMT diodes on it. Over the past several months, I’ve been gathering Hot Air & De-Soldering equip. This is all new to me.
The original RLS135 SMT diodes were problematic for many DX-70 owners. Based on an old thread, I planned on replacing them (a few each BPF board) with RN731v and ordered 30x 5-6 years ago. These things are smaller than a rice grain.
I posed my circumstance to Co-Pilot and it suggested 1N4148, regular axial diodes that anyone reading this likely has a lot of. Not the same package but small enough to be do-able if I bend & cut the leads just right.
I need hot air practice just to get the BPF boards out. The DX-70 has been disassembled for a decade and not knowing how to go further is what stopped me (BPF boards soldered-in with heavy braid that needs more than an iron to free). I can see my way through this ‘in my head’ now, which I couldn’t do a decade ago. I learned a lot from this forum. Thank you for all the advice as I floundered through this & that.
Neil
The original RLS135 SMT diodes were problematic for many DX-70 owners. Based on an old thread, I planned on replacing them (a few each BPF board) with RN731v and ordered 30x 5-6 years ago. These things are smaller than a rice grain.
I posed my circumstance to Co-Pilot and it suggested 1N4148, regular axial diodes that anyone reading this likely has a lot of. Not the same package but small enough to be do-able if I bend & cut the leads just right.
I need hot air practice just to get the BPF boards out. The DX-70 has been disassembled for a decade and not knowing how to go further is what stopped me (BPF boards soldered-in with heavy braid that needs more than an iron to free). I can see my way through this ‘in my head’ now, which I couldn’t do a decade ago. I learned a lot from this forum. Thank you for all the advice as I floundered through this & that.
Neil
