dynamics

According to the attached schematics, the failure of which specific diode within Generator Control Unit 1 would result in a complete loss of power from Generator No. 1?
  
     
 

Are continuity measurements performed with a standard multimeter, and insulation resistance tests(megger test) carried out with a conventional megohmmeter, acceptable for verifying the following conditions, or is the use of a specialised test instrument required? 1-A short circuit within the compensator unit between the HI-Z and COMP LO-Z terminals. 2-An open circuit or short circuit in the TANK LO-Z conductor. 3-A short circuit within the tank unit between the HI-Z and TANK LO-Z terminals. 4-An open circuit or short circuit in the HI-Z conductor.

Thank you kindly for your detailed explanation. I would be most grateful if you could forward me a scanned copy of the manual.

According to troubleshooting section of AMM If the fuel quantity indicator displays zero kilograms and presents Error Code 2, this signifies the presence of a short circuit within the compensator unit(HI-Z to COMP LO-Z). An Error Code 4 indicates either an open circuit or a short circuit within the TANK LO-Z line.Should Error Code 5 be displayed, it denotes a short circuit in tank unit (HI-Z to TANK LO-Z).Finally, the appearance of Error Code 10 implies the existence of either an open circuit or a short circuit within the HI-Z line itself.
Could you please clarify the technical meaning of the terms 'HI-Z to COMP LO-Z', 'TANK LO-Z line', 'HI-Z to TANK LO-Z', and 'HI-Z line' within the context of the fuel quantity measurement system?