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HP-97 Circuit
04-15-2021, 01:19 AM (This post was last modified: 04-15-2021 01:34 AM by teenix.)
Post: #1
HP-97 Circuit
Hi all,

I found some more circuit diagram issues with the HP-97 service manual.

(1)
Q4 is supposed to be a NPN type but is shown as PNP.

(2)
There is an extra wire connects Vb to R7, Q4 emitter and Q2 base.

Modified schematic attached.

Edit:

I've posted a modified Service manual at http://www.teenix.org/97ServMan.pdf

It also has cleaned up oscilloscope images.

cheers

Tony


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Messages In This Thread
HP-97 Circuit - teenix - 04-15-2021 01:19 AM
RE: HP-97 Circuit - AndiGer - 04-15-2021, 07:47 AM
RE: HP-97 Circuit - teenix - 04-15-2021, 10:03 AM
RE: HP-97 Circuit - hpux735 - 10-11-2021, 05:15 PM
RE: HP-97 Circuit - Kees Bouw - 10-11-2021, 07:02 PM
RE: HP-97 Circuit - hpux735 - 10-11-2021, 08:03 PM
RE: HP-97 Circuit - AndiGer - 04-15-2021, 03:31 PM
RE: HP-97 Circuit - teenix - 04-16-2021, 05:14 AM
RE: HP-97 Circuit - AndiGer - 04-16-2021, 06:59 PM
RE: HP-97 Circuit - teenix - 04-16-2021, 09:15 PM
RE: HP-97 Circuit - AndiGer - 04-17-2021, 08:54 AM
RE: HP-97 Circuit - Siegfried - 04-27-2021, 11:00 AM
RE: HP-97 Circuit - Kees Bouw - 10-11-2021, 07:09 PM
RE: HP-97 Circuit - Eric Rechlin - 10-11-2021, 07:59 PM



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