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HP1740A Repair

R

ronspencer

Jan 1, 1970
0
Traces comes on full bright and intensity control has little affect
Manual indicates ther should be .4V on pin 3 of U1 but I get -.61V
Pin 7 reads -.176V which baffles me as the schematic shows 3 and
shorted together. My thinking is that U1 is bad

Any thoughts

Thanks much

Ro
Raleigh, N
 
N

N Cook

Jan 1, 1970
0
ronspencer said:
Traces comes on full bright and intensity control has little affect.
Manual indicates ther should be .4V on pin 3 of U1 but I get -.61V.
Pin 7 reads -.176V which baffles me as the schematic shows 3 and 7
shorted together. My thinking is that U1 is bad.

Any thoughts?

Thanks much.

Ron
Raleigh, NC

According to my 1740A manual and U1
pin 7 is +15V and pin 3 is non-inv i/p

electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse
 
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