HP 2113B service manual / schematics

From: Peter Brown <peterbrown10_at_hotmail.com>
Date: Mon Nov 15 13:17:26 2004

Hi All,

I'm in the process of powering up a 2113B. I took a look at the output
voltages from the PSU and they all look fine *except* the -2 volt line that
appears to be running at -2.47 volts.

I have the 2109B / 2113B installation and service manual but the service
procedure just talks about adjusting the 5 volt line and all the other
supply voltages tracking this one.

I can't find a schematic for the power supply in the documentation that I
have 02109-90015.

Questions:

1. Is my copy of 02109-9005 (Installation and service manual) incomplete
i.e. should there be a schematic in it?
2. Does anyone have a schematic for the 2019B / 2113B computer power supply.
  Note that the 'B' is important as the power supply was revised between the
'A' and 'B' models.
3. What is the -2 volt line used for?
4. Does it matter that the -2 volt line is outside specification?
5. Is a full schematic available for the 2113B computer? - I'm sort of
interested in what exactly is going on on the motherboard.

Many thanks

Peter Brown
Received on Mon Nov 15 2004 - 13:17:26 GMT