[Test-Equipment] Need Help with HP Scope.

Thu, 10 Jul 2003 17:41:57 -0400

Hello,

I know this is a few days late, but maybe I can help.
I have an 1725A service manual, I think the vertical
section is the same.

Here is some quick numbers.
U1(vertical amp)
Input pins 3 and 6, list +13.8v
Input emiter pins 4 and 5, list +13.1v
Output pins 12 and 13, list +28v

U2(vertial output)
Input pins 5 and 7, same as U2 output
Output pins 2 and 3, list +40v

Supplys to the board.
+15, -15, and +53.3

If both sides(non-inverted and inverted) are the same
votage, then your trace should be in the center
of the crt. 
BTW, like you said, these are 100% custom,
so you will need to get them from a doner 172x.

Let me know what other info you may need   
Jim Martz

> Hi,
>  I have a proble with a HP scope from the 1720 series. These are 27MHz
> scopes. The unit that I have is a 1727A.
> 
> I am unable to center the trace in the vertical direction. The gain seems
> low. I think the Vertical amplifier is bad.
> 
> Can anybody help with either a vertical amplifier board or the custom ics
> and hybrid part nos:
> 
> 5081 -3022 and 5081- 3024
> 
> Thank you advance.
> 
> Sincere regards,
> 
> John Barnes
> 
> 
> 
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-------------------------------------------
Jim Martz,
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