91
Unit Operation Checks
8. HV PCB ASSY
Outline
HV PCB ASSY have the function that produces the high voltage of detection. MAIN CTRL-A
have the function that controls the voltage and on/off that occur.
HV PCB ASSY are being fixed inch a normal device, that is ,EI mode.
HV PCB ASSY, NCI(225-11195-92 ) are being fixed in a NCI option.
CD(Conversion dinode) HV Circuit is swictching power supply POS(1 to 10kv for NCI)and
NEG(-1 to -10kv for EI and CI).
Detector voltage(EM)＝-0.5kV〜-3kV
Conversion di-node voltage ( CD)=-1kV〜-10kV or+1kV〜+10kV
Detection device lens voltage=0.084×conversion di-node voltage
Action confirmation method
If an abnormality occurs, follow the procedures below to check the operation of the HV
PCB ASSY to efficiently diagnose the problem.
Please refer to even the item of "the confirmation of MAIN CTRL-A high pressure power
supply control circuit".
CAUTION！
The voltage on a foundation becomes biggest 10kV with DC. Please do not touch on
unpreparedness, Because of the damage prevention of electric shock prevention,
measurement devices.
Please turn off the power supply when I remove a foundation. Next, please
discharge the remaining electric charge of a high voltage terminal in body with an
electric wire and driver etc. And, please do so that it touches.
１．Confirmation of the electric discharge by insulation defectiveness
Please turn off EM and CD On a service program.
And, please confirm the presence of the sound by an electric discharge.
It is thought as the insulation defectiveness of HV PCB ASSY, when it is heard as the sound
that discharges is occurring outside a vacuum vessel. In this case、You had better
To Next Page
Loading...
Need help?
General
