Re: [help] Only noise being seen while IQ balance / phase lo / phase hi.

Jose Tent
 

On Fri, May 29, 2020 at 05:40 AM, dl8lrz wrote:
  • the junction of R39&40 =   3.32v
The voltage should be about 4.2V (Manual), 3.32V is little. If C24 is installed with the correct polarity, this can indicate a defective IC10 ??
R39&40 junction is pin 5, +input for 10B.  I'm getting very suspcious of the IC10.   All voltage except pin 4 & 8 (V- in & V+ in)  is wrong.  

Measured voltage for IC10 are:   pin  1  ~ 8   :   11.7  / 11.7 / 11.7 / 0  ==  3.3 / 2.31 / 11.7 / 11.7    (Volts) 
Manual indicates :                        pin  1  ~ 8   :   5.8   / 5.8   / 5.8  / 0   ==  4.2 / 3.94 / 5.83 / 11.67    (Volts) 

I tried to suspect that I've done something wrong instead of suspecting a component.  But, perhaps I should just replace the IC rather than wondering if it's good or NG.   Wonder if I can source this IC locally. 




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