Electronics > Beginners

Component checking in circuit

(1/1)

Crambone:
If I have 2ea identical surface mount boards and one is bad can I compare component (resister, capacitor.....) to the known good one to identify a bad part?
Example: I check C1 on good board and get 10uf and then check in bad circuit and get 10uf then I can assume that cap is good? Can I keep doing this part for part until I find one that is different and then assume that is the bad part or one of the bad parts? 

GerryR:
I would think that taking measurements, while each unit was powered up, and comparing the voltages would give more accurate results (unless smoke has been released!).   :-//  But doing it with no power is a good start.  If you have a way to inject a signal and chase it around, that would be another approach.  Not knowing the circuit makes it difficult to know the best approach.

Crambone:
It’s an RCI 2995DX circuit , http://www.cbtricks.com/radios/rci/rci_2995dx/graphics/rci_2995_dx_sch.pdf
TP7 was grounded by accident with the mirror board out that normally connects TP7, 8 & 9.

GerryR:
Looking at the schematic, you can check for continuity (Ohms) between Q60 collector and TP7 and continuity between TP7 and C219-C220-L26 junction, and compare the ohms readings to the good board.  My first inclination is to suspect L26, but...

Navigation

[0] Message Index

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod