HP 5973 Hardware Manual page 291

Symptoms of malfunctions
baseline is falling, 72
baseline is high, 72
baseline is rising, 72
baseline wanders, 73
chromatographic symptoms, 70 – 74
difficulty in mass filter electronics, 84
difficulty with the EM supply, 84
difficulty with the fan, 85
difficulty with the HED supply, 85
difficulty with the high vacuum pump, 85
error messages, 84 – 88
fan is not operating, 69
foreline pressure has exceeded 300 mTorr, 86
foreline pressure is too high, 79
foreline pressure is too low, 80
foreline pump is not operating, 68
gauge controller displays 9.9+9 and then goes
blank, 80
GC does not turn on, 68
GC/MSD interface will not heat up, 83
general symptoms, 68 – 69
high abundances at m/z 18, 28, 32, 44 or at m/
z 14 and 16, 75
high background, 75
high mass sensitivity is poor, 78
internal MS communication fault, 86
ion source will not heat up, 82
isotopes missing or ratios are incorrect, 75
LEDs are all blinking, 69
lens supply fault, 86
log amplifier ADC error, 86
mass assignments are incorrect, 76
mass filter (quad) heater will not heat up, 83
mass spectral symptoms, 75 – 78
MSD does not turn on, 68
MSD is on but status LEDs are all blinking, 69
no peaks, 70, 86
peak widths are inconsistent, 76
peaks are fronting, 71
peaks are tailing, 71
peaks have flat tops, 72
peaks have precursors, 76
peaks have split tops, 72
poor repeatability, 74
poor sensitivity, 74
power indicator on the gauge controller does
not light, 81
pressure symptoms, 79 – 81
relative abundance of m/z 502 less than 3%, 77
retention time drifts (all peaks), 73
status LEDs are all blinking, 69
temperature control disabled, 87
temperature control fault, 87
temperature symptoms, 82 – 83
the high vacuum pump is not ready, 87
the system is in standby, 87
the system is in vent state, 88
there is no emission current, 88
there is not enough signal to begin tune, 88
vacuum manifold pressure is too high, 79
vacuum manifold pressure is too low, 80
System ready signal, 249
Index
291