[Test-Equipment] HP 8690 sweep generator

[Lecroy]

Dear All,
I have a HP 8690B, the mainframe is in a very bad condition but the plug-in
unit works well.
I think about making my own power supply and ramp generator to drive the
plug-in module.
I found a military calibration manual but no schematic or indication about
the voltages/signal which are send to the plug-in module.

Does anyone has information, schematic ??

Regards
David / F1URI