problem in HP 3000 System 37

J. David Bryan jdbryan at
Thu Sep 2 15:35:00 CDT 2021

On Thursday, September 2, 2021 at 8:16, Gavin Scott via cctech wrote:

> P.S. The HP Museum has the CE handbook for the 37 and Micro 3000, but
> it's in the 3000 Micro XE section. You can find it by searching within
> the Documents page linked at the bottom of the left side navigation
> bar. 
> 3000-37-MicroFamily_CEServiceHandbook_30457-90039_200pages_Feb89.pdf

Page 5-31 of that manual details the LED display codes.

Note also that the Series 37 requires certain PCAs to be in certain slots 
(pages 3-2 and 3-4), so it would be good to verify this too.

And as Gavin mentions, the CPU tries to talk to the terminal after 
completing the self-test, so it's important to have a working terminal 
connected and turned on when powering up the system.

                                      -- Dave

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