On Sat, Oct 14, 2023 at 06:48 AM, tuneupmagic (null) wrote:
I understand repair action of your LA-1K to be remove and replace of R-9/C-1, but has Palstar's failure analysis determination successfully identified the root cause, that Mark Ward (Palstar technician) told you he will "identify what the root cause is" as I read in your post /g/la1k/message/1423 dated September 28, 2023?
It's also important for Palstar to identify in their work order the specific LA-1K circuit card or
circuit cards in which they removed and replaced R-9 and C-1.? Again, said repair action, in and of itself, isn't the root cause!
Remember ever using the 5-Whys approach to determinate the root cause of a problem?
In the case of an incorrect LA-1K SWR readout, it might go something like the followings:
1. Why? - SWR circuitry malfunctioning.
2. Why? - defective R-9 and C-1 on circuit card # 1 and circuit card # 2, respectively.
3. Why? - R-9 and C-1 are of very poor manufacturing quality.
4. Why? - Acquiring components from questionable PRC sources of supply.
5. Why? - Reducing costs of LA-1K manufacturing to maximize profits.
Oh, PRC = People's Republic of China
73
Ray
KJ5MI
