Don, and others
Thank's for your answer
First my native language is the French, so i use reverso to translate.
My oscilloscope is a HP182T (i bought the hp182T + spectral analyzer HP 8558b on ey)
I know they broke down, but I got a good price on E..y.
The HP182 now works, there was only one Zener "burn"
So there is some confusion for the word display.
The problem is on the displays?above the reference level and freq span button (the four "digits") on the spectral analyzer. (see picture)
No frequency on display. they are "black".
to understand what I¡¯m doing, you have to watch this video first.
we can test the analyzer, without putting it "plug-in" of HP182
I therefore rowed the +15v and -12.6v power supplies of the HP182 by wires directly on the analyzer.
so it's open and i can see some signals with my Philips oscilloscope (the second)
I did not bring back the 100v which is only used to sweep? ?horizontal the oscillo HP182.(at this time)
So I was able to control various signals, the sweep (pcb A8), the meter voltage?which varies with frequency . ) (pcb A7)
this famous signal meter voltage is used to display the frequency on the digits. (The pcb of the digits? is a kind of converter voltage/ displays /analogique / digital)
all signals are good on this connector attached to this PCB
THE BIG PROBLEM IS DOCUMENTATION
I have 2 documents HP 8558-60102 (July 1985) and HP 8558-60043 (October 1977)
But unfortunately, the schematics are more recent and the schematic??PCB of the displays is not the one I have
see the pictures of the pcb, it¡¯s an assembly of 5 small pcb, and that¡¯s the schematic of what I need.
(Here, the converter is only made with 74xxxx circuits and transistors, not with a 20-legged circuit where everything is integrated.)
So you need a manual service older than 1977??? Big question. Someone have the schematic???
my serial number is 1321Axxxx
see pictures:
The spectral analyzer
My pcb display (recto / verso)
Diagram of more recent display
The more recent display?
I think you¡¯ve figured out that¡¯s the old schematic I need
thank's for your answers
Gerard
