Shimadzu GCMS-QP2010 Series, Service Manual, Page: 92 / 168

92
exchange this part.
Please confirm the following, at the time of such that an electric discharge is occurring in a
vacuum vessel.
Please suspend a device. You had better confirm whether dust is not adhering, whether or
not wiring is appropriate after takes out a detection device unit.
There is case that is not determined as an error in the electric discharge of a weak electric
discharge and period absence. The attention is necessary.
２．
Confirmation of the wiring within a vacuum vessel
Please confirm whether or not, the output of the high voltage power supply is out with the
next method.
You monitor the base line of the condition of filament off with a service program.
Please turn on only EM. EM is normal if the base line is goes up a moment.
Please turn on only a CD. If the base line goes up a moment in the case of an UNNCI
mode (-1kV
〜
-10kV) ,the CD is normal.
If the base line descends a moment conversely in a NCI mode (+1kV
〜
+10kV), The CD
is normal.
When the base line does not fluctuate normally
、
it stops the device and take out the
detection device unit and confirm please whether wiring is not coming off.
When you turned on EM and CD, in the case that an error occurs, next malfunction of a part
is thought about whether someday.
The short circuit of the wiring inside
a vacuum vessel is conceivable as the cause of
defectiveness.
Or, it is conceivable as the cause of the defectiveness of
HV PCB ASSY.
Besides, it is conceivable as the cause of the defectiveness of
MAIN CTRL-A.
３．
Confirmation of voltage
In the case that there is a high voltage measuring apparatus, The voltage of a high pressure
terminal is able to be confirmed directly.
Do not conduct it because the measurement by a general tester is dangerous.
Please set up each detection device voltage(EM), conversion voltage(CD).
Please confirm voltage, with each next terminal.
Detection device voltage
Measurement point: J11 [EM]
Inside resistance: 100 [k Ω ]