KX1: U9 output = 8v?

[Jeremy Cowgar-2]

U9 should be a 6v regulator, no? 77L06. It's getting 13.8v and
outputting 7.96v in the Alignment and Test Part I. The manual states on
U3, pin 6 should be 6+/-0.25 v. Because of U9 being 7.96, so is pin 6.

Any thoughts?

Jeremy
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[Jeremy Cowgar-2]

Sorry, user error with a bit of panic.... I don't know how I did it, but
I installed C10 (bottom of the board) into C38's position. C10 is a 10uf
electrolitic on the output of U9 to ground. That fixed it all, now I
just hope I didn't blow up U3.

Jeremy
KB8LFA

Stuart Rohre wrote:

>Jeremy, there is not another diode in series with the reg. chip which would
>step up its output voltage?
>
>Are you checking against voltage test points listing of voltages from the
>manual or the web site?
>
>What kind of meter are you using, is it 10 megohms input impedance like a
>DMM?
>  
>

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[Jeremy Cowgar-2]

Jeremy Cowgar wrote:

> Sorry, user error with a bit of panic.... I don't know how I did it,
> but I installed C10 (bottom of the board) into C38's position. C10 is
> a 10uf electrolitic on the output of U9 to ground. That fixed it all,
> now I just hope I didn't blow up U3.

Ah, I think I'm alright. U3 is a TC4427 which mouser says is a Dual
High-Speed Power MOSFET Driver. It's spec sheet says: Wide input supply
voltage operating range: 4.5v - 18v. Mouser has a pretty cool site I think.

Thanks,

Jeremy
KB8LFA

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