Re: Looking for a photo of the bottom side of of the PCB under filters
|
I compared the pcb with the filter mod, and that somebody previously had attempted the mod, cut traces, 1 cap in place, not the 2nd, nor the resistor. The really strange part to me was that the pads for filters did not look origional, so I have to believe that when the mod was done somebody replaced with the same TOKO parts, which from the exterior surface showed signs of the issue and when the came apart showed signs internally of issues.?? New filters installed, new SMT cap kit ordered, looks like it will be a project next weekend.
On Saturday, January 26, 2019, 1:22:11 PM EST, 'Philip' pcsalley@... [FT-857] wrote:
?
That small cap is likely a user inserted DC blocking cap that is recommended for the 857 filters that have a history of being destroyed by DC to filter.? This is a Yaesu design fault.?? Many 857s have had filters replaced over time where to repair tech added the cap to prevent a repeat performance if U will.?? Regards, Phil / K4PO ? ?
|
