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Re: HP-1421A Q109 Voltages

 

Here's a clean scan of the section you are looking at.

ChuckA

On 3/29/2024 3:16 PM, n4buq wrote:
Does anyone have a readable schematic for the A101 board in a 1421A? I have a paper manual on order but until that arrives, I would appreciate finding out the voltages shown for Q109 (Page 5-16, Figure 5-9). From what I can tell, the online scan appears to show:

C: +48V
B: -8.8V
E: -9.4V

The value for B is particularly blurry but would like to know for sure what all of those are.

Thanks,
Barry - N4BUQ




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1421A_pg5-16.jpg

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