Electronics > Repair
CMU200 Rx level issue / failed loop test
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DavidAzulay5000:
The mission fails :(
I changed the filter twice
B39841B4122U410 836MHz SAW Filter SMD

In addition, 2 SMD resistors accidentally flew that I de soldered using a hot air station
I looked at the pictures I took before
I'm really mad at myself for not taking a clean picture of this area
From what I've seen resistors are
100 OHM
1 KOHM
The filter I ordered does not pass the internal test
I will try to reverse the polarities
I have no idea what input is
and output
of the circuit
I'm really starting to hate R&S
There is no schematic  |O
DavidAzulay5000:

--- Quote from: DavidAzulay5000 on February 06, 2023, 06:01:14 am ---The mission fails :(
I changed the filter twice
B39841B4122U410 836MHz SAW Filter SMD

In addition, 2 SMD resistors accidentally flew that I de soldered using a hot air station
I looked at the pictures I took before
I'm really mad at myself for not taking a clean picture of this area
From what I've seen resistors are
100 OHM
1 KOHM
The filter I ordered does not pass the internal test
I will try to reverse the polarities
I have no idea what input is
and output
of the circuit
I'm really starting to hate R&S
There is no schematic  |O

--- End quote ---
DavidAzulay5000:
 |O
_Wim_:
Hi, where did the resistor come from in the attached picture?
_Wim_:
And maybe a few other questions: do you measure any resistance between pin 2 and pin 5 of the filter? How does that resistance compare to a brand new filter?
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