Hello,

I am a ham radio operator and have a little bit of electronics knowledge,
and I am currently pursuing my Electrical Engineering degree. I have worked
for several years as a maintenance mechanic in a manufacturing. I am
working on a CNC machine that uses a NTE935 IC to generate the 5 volts that
supplies the servo control cards.
The IC is new. Another mechanic was working on the machine long before I
got to it, and he replaced whatever was originally in the machine with the
NTE935. The original regulator had a TO3 case, and according to the manual,
and the needs of the servo boards, it should be delivering the 5 volts to
the system.
I'm not sure the guy has installed / wired the chip properly or if it is
even the correct chip.

The problem is, the chip is not delivering the 5 volts to the system.

I was wondering if anyone could tell me what sort of input is expected on
the adjust pin to control the voltage that is output by the chip?

I have approximately 11 VDC on the Vin pin, and nothing on the Vout / Case,
and I somehow managed not to note what I had on the Adjust pin, which
controls the output of course.

What I'm hoping is that I can figure out what voltage or current I should
have going to the Adjust pin in order to command the chip to output the
required 5 volts.

If anyone could give me a hand I'd greatly appreciate it.

John

On 2006-09-17, John wrote:

The IC is new. Another mechanic was working on the machine long before I
got to it, and he replaced whatever was originally in the machine with the
NTE935. The original regulator had a TO3 case,\

LM7805 and LM317 had TO3 versions ( with a K suffix)

The problem is, the chip is not delivering the 5 volts to the system.

I was wondering if anyone could tell me what sort of input is expected on
the adjust pin to control the voltage that is output by the chip?

answers to all that will be in the NTE935 data sheet.

I have approximately 11 VDC on the Vin pin, and nothing on the Vout / Case,
and I somehow managed not to note what I had on the Adjust pin, which
controls the output of course.

Is the NTE935 known to be good?


--

Bye.
Jasen