Hi,anyone have a schematic of the SLA1500 driver card?I got a OEM clone here with intermittent issue on the High side drive.
For normal condition both High and Low output from the driver card is around 2.3V but once it got issue,the High side will output of around 4.4V something,which of course will turn on the 6N137(and proceeding BJT,which will turn on the MOSFET) and lead to high DC offset on the output.
All three 78M05 are working fine as measured,and also the symmetrical supply feeding the driver card OPAMP are fine too(got +11 something and -11 something all time).Swapping the driver card from a working unit WON'T help either.
Funny thing is the symptom is intermittent,sometimes is ok and sometimes is not.
Thanks in advance!
For normal condition both High and Low output from the driver card is around 2.3V but once it got issue,the High side will output of around 4.4V something,which of course will turn on the 6N137(and proceeding BJT,which will turn on the MOSFET) and lead to high DC offset on the output.
All three 78M05 are working fine as measured,and also the symmetrical supply feeding the driver card OPAMP are fine too(got +11 something and -11 something all time).Swapping the driver card from a working unit WON'T help either.
Funny thing is the symptom is intermittent,sometimes is ok and sometimes is not.
Thanks in advance!