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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack

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INFINIUM:
You know why the 3volts battery is there ,I Have one HP 54845  similar ,with a DALLAS chip I think with a battery inside or is this one in the board you show?
the screen gave me the CMOS fault?  the battery was OK  3,2V?? :palm:

nctnico:
CMOS fault from the BIOS means you have a problem in the Dallas chip. You can probably source these somewhere because billions of motherboards where made using this Dallas chip. However try to see if you keep getting the error after the oscilloscope has been powered down for a day.

analogRF:

--- Quote from: INFINIUM on November 01, 2018, 06:12:16 pm ---You know why the 3volts battery is there ,I Have one HP 54845  similar ,with a DALLAS chip I think with a battery inside or is this one in the board you show?
the screen gave me the CMOS fault?  the battery was OK  3,2V?? :palm:

--- End quote ---

No I was talking about the CR2032 battery on the PCI board that is the interface between the mobo and acq board. It is seen in the upper left side of your photo.  I still dont know what information that battery holds up in the SRAM that is on the same PCI board. Cal data? system state?
however I am sure it has nothing to do with motherboard CMOS (BIOS).

The CMOS error you are getting at boot time is most likely related to the battery inside the Dallas chip being dead but the system should be bootable I guess. But it probably will use default bios setup and you must properly setup the BIOS parameters every time you boot it up
until you replace that dallar chip. This is my speculation.

INFINIUM:
Thanks ,
the OSD  was abandoned more than 15 years, almost now dead :'( in 2000 it was OK.
First  the CMOS ERROR asked me the bios FLOPPY  , last month..
I change the video card battery that was  with 3 Vols.
nothing  the same error , next week started to suddenly stop and start ,intermittent ..
now does not start at all  , the service manual said , put the resistor to inhibit the Power supply and replace it if does not start.
I guess is true   , trying to replace the PS , but there are to many signals in the control connector , I am busy in a small garage with cars ,etc. and I need the schematics to prevent putting wrong voltages in sensible circuits. :bullshit: :-BROKE :-/O.

INFINIUM:
Somebody can  measure the voltages coming from the  power supply  from the 2 big connectors in the HP54845 OSD  in one I think is +5 minus 5  , in the other 12v + minus and one pair XX  volts ? in total there are  5 pairs with different colours , I am trying to replace this power supply for one standard for PCs , the small white connector has the 15 volts inhibit signal and the extra for sincro.. test or something rare.
colour code  cables and voltage . in resume  I need,
if one day the PS fails you also will have less trouble.
Please be aware that without PCB cards or problem in the laching relay the PS does not turn on

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