Shimadzu GCMS-QP2010 Series, Service Manual, Page: 64 / 168

64
Problems during tuning
8. No peaks obtained (peaks extremely small)
Check the tuning file.
□
Are the lens voltage values appropriate?
Revert the lens voltages to the default values if unclear whether the tuning values are
appropriate.
The default values are as follows:
L1 1.0V / L2 -20V / L3 -1.5V / L4 -40V / P-Rod -3.5V / M-Rod -3.5V / FIL-EV -70V /
FIL-EM 60V / CDD -10000V / EM -900 ~ -1200V
Check the introduction of PFTBA.
□
Is the PFTBA volume appropriate?
Approximately 5mm from the bottom is appropriate.
□
Is the sound of the PFTBA valve opening and closing audible?
If no sound of valve operation is audible
−−
> Check MAIN CTRL-A.
Check the lens voltage.
□
Is each lens voltage output correct?
If any trace of peaks is apparent, set each voltage individually to 0V and check for
changes to the peak height. If absolutely no peaks are visible, measure the
voltages at the checkpoints on MAIN CTRL-A.
Check the degree of vacuum.
□
Is the IG value within the normal range?
A value not exceeding 1 to 2E
-3
Pa is normal.
□
Appropriate GC column flow rate?
□
Large air components (m/z28, m/z32)?
See 6. Pirani gauge, IC value too high, IG does not light.