I bought this scope on eBay from Germany about a year back.
It was selling as not working and came with the HD01 option, having seen Dave's video I figured it should be an easy repair
Due to really poor packing (large sealed-air pouches only, in a much too large box) it arrived with a well shattered plastic case, fortunately the front panel survived thanks to the dedicated cover.
While collecting the bits and disassembling the remains I found a gold plated pogo-pin floating around so half expected that it sprung its way into the scope and caused a short on the acquisition PCB.
So I finally gathered some courage to at least test the electronics.
Before powering it up I had a peep in the PS9384 PSU, no burn marks or debris, a close look at the PCB's showed that the Nichicons hat started oozing. It was caught early enough to not be a significant mess. All secondary side electrolytics were replaced on the Power Systems Inc. PSU, and my "Save the hybrid" ® mod. applied. Also checked start-up and bleeder resistors, removed auto voltage selector assembly.
On the Integrated Power Designs PSU, all electrolytics were replaced except for the primary bulk one, TO220 diodes were tightened a little harder.
Lay out on the dining table the scope came up on first attempt, after 3 min. while I was trying to bring all 4 traces on screen there was a sudden crackle in the PSU, scope went dead...
A quick peep showed the 1A fuse (after diode bridge) on the Integrated Power Designs PSU had blown.
The IRF830 was dead, the UC3844 survived though, a closer look showed dust and capacitor electrolyte build up under the MOS, opto and TL431 despite having been blown through with an air compressor.
After better cleaning and reassembly it was running again. All unshielded channels seem to at least be responsive to the CRT flyback EMI.
I've checked / readjusted supply voltages.
RTC battery needs replacing...
Next step is to reassemble it and actually use it to check for hidden faults, for now that means sacrificing my working 9344 for the case
So I'm either after a spare case at a low price or I'll have 9344 parts for sale soon.