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If the checks above are all satisfactory but still no peaks are obtained, possibly the settings
of trimmers VR1 and VR2 are seriously wrong. In this case, turn VR1 while monitoring the
low mass numbers m/z18 and m/z28 to obtain equal peak amplitudes. If this adjustment is
not possible even by fully turning VR1, switch JP1 and attempt the adjustment again.
Repeat the adjustment with 1) JP1 unshorted, 2) 1 to 2 shorted, and 3) 2 to 3 shorted. If
equal peak amplitudes are achieved, conduct fine adjustment of the trimmers using the tool
software.
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