Yes, I did see the 1850v on the schematic but dismissed it as a misprint because the CRT Board on P54 shows those two connections from P5 (actually soldered direct to CRT socket) as being 6.3v also as C440 being rated at 22uf @ 35v? C441 is on that section with the HV slots and is surface mounted, I'm not sure where C449 actually is at present, still trying to locate it myself. C440 is mounted the other side adjacent of the PCB to the transformer on the small section that has the slots cut away round it. The component overlay pages P68 and P69 show the required detail, P68 is readable but P69 is extremely hard as the test is black over dark grey ground plains etc.
D444 I removed for better testing as access to the area is restricted and I was not sure of getting a good connection on my meter probes, it is open circuit, so new ones ordered, I'll replace all the diodes in that section once I have sourced the other two as well.
When I first clapped eyes on this the screen when booting up did display the Hameg usual display of the logo and some text along the bottom, once the logo disappeared it was replaced with random dots over the screen so I knew it had problems along with the control issues which were mechanical with faulty couplings, missing shafts and knobs which had 4mm holes somehow wedged onto 2mm shafts.
Hence why I have been concentrating on regaining control, I could see no point in tackling the electronics without being able to operate the controls?
Once Amazon arrive with my desktop PC cooler I could send you a copy of the manual in English but as you have already seen, it is not exactly the best manual in circulation.
I have not checked the voltages yet as I'm struggling to find suitable test points as the boards do not indicate what voltages should be where. Unlike other scopes I have worked on where the voltagess are printed on the PCB by the sockets. This one has loads of plain grey ribbon cables pushed into sockets everywhere without any indication as to what they are for etc.