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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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MRF5015 in a FT-847
is it a known problem that the driver
on the HF PA board (Power FET) for the FT-847 rigs develop a leg separation problem inside it self under the ceramic lid ? seems this animal i have likes the fail after the tranny gets hot, it simply just drops out. using a plastic tool and applying very little pressure will put it back in service again! you can even hear a very little arc talking place also! and yes i have checked and double checked for solder joints. there is no problem there how ever! i can say that i really don't like the way the transistor was put in! , there is no relief at all for thermo movement and this part gets hot by nature... they could have at least put a slight bend in the legs before soldering and only soldered what was needed instead of the whole leg which gives it no relief. this is a MRF5015, any known experience with these? -- Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
#2
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MRF5015 in a FT-847
go to the foxtango group at www.foxtango.org
and somebody may have had the same fault.this group is for all yaesu users. "Jamie" t wrote in message ... is it a known problem that the driver on the HF PA board (Power FET) for the FT-847 rigs develop a leg separation problem inside it self under the ceramic lid ? seems this animal i have likes the fail after the tranny gets hot, it simply just drops out. using a plastic tool and applying very little pressure will put it back in service again! you can even hear a very little arc talking place also! and yes i have checked and double checked for solder joints. there is no problem there how ever! i can say that i really don't like the way the transistor was put in! , there is no relief at all for thermo movement and this part gets hot by nature... they could have at least put a slight bend in the legs before soldering and only soldered what was needed instead of the whole leg which gives it no relief. this is a MRF5015, any known experience with these? -- Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
#3
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MRF5015 in a FT-847
Hi there Jamie.....What you should do is troubleshoot that stage to see
if the transistor is failing as you think. Heat related problems in the FT-847 are notorious in several areas. Will discuss this further if you'd like - the yahoo group has some good info as well. 73 - Gord VE1AJF |
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