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Septum, leaking,
53
Side plate
lubricating the O-ring,
118
O-ring,
182
thumbscrews,
180
Signal amplifier board,
220
Signal, not enough to begin tune,
Smartcard III. See LAN/MS control card
Solvent peak
effect if analyzer is on, 47,
effect on vacuum gauge,
Startup
failure of the MSD to,
31
See also Pumpdown
Static discharge. See Electrostatic
discharge
Status display,
217
Storing the MSD,
94
Switch, power. See Power switch
Switching, between EI and CI,
Symptoms of malfunctions
analyzer chamber pressure is too
high,
42
baseline is falling,
35
baseline is high,
35
baseline is rising,
35
baseline wanders,
36
can not complete CI autotune,
chromatographic symptoms,
difficulty in mass filter electronics,
difficulty with the EM supply,
difficulty with the fan,
47
difficulty with the HED supply,
difficulty with the high vacuum
pump,
48
error messages,
47
to
52
excessive noise or low signal-to-noise
ratio in CI MSD,
74
foreline pressure has exceeded 300
mTorr,
49
foreline pressure is too high,
foreline pressure is too low,
foreline pump is not operating,
gauge controller displays 9.9+9 and
then goes blank,
43
GC does not turn on,
31
GC/MSD interface will not heat up,
general symptoms,
31
to
5975 Series MSD Troubleshooting and Maintenance Manual
high abundances at m/z 18, 28, 32, 44
or at m/z 14 and 16,
high analyzer chamber pressure with
reagent gas flow,
high background,
high electron multiplier voltage in CI
52
MSD,
high mass sensitivity is poor,
internal MS communication fault,
48
ion source will not heat up,
43
isotopes missing or ratios are
incorrect,
large peak at m/z 19 in CI MSD,
lens supply fault,
log amplifier ADC error,
mass filter (quad) heater will not heat
up,
mass spectral symptoms,
MSD does not turn on,
17
MSD is on but foreline pump is not
running,
no or low PFDTD signal, but reagent
ions are normal,
no or low reagent gas signal,
no peaks, 33,
no peaks in CI MSD,
peak at m/z 32 in CI MSD,
80
peak widths are inconsistent,
33
to
37
peak widths are unstable in CI
47
MSD,
47
peaks are fronting,
peaks are tailing,
48
peaks have flat tops,
peaks have precursors,
peaks have split tops,
poor repeatability,
poor sensitivity,
poor vacuum without reagent gas
flow,
power indicator on the gauge controller
42
does not light,
43
pressure does not change when reagent
32
gas flow is changed,
pressure symptoms,
pressure-related symptoms, overview
(CI),
46
reagent gas ion ratio is difficult to adjust
33
or unstable,
39
66
38
79
41
49
45
38
75
49
49
45
38
to
41
31
32
73
71
49
69
76
39
81
34
34
34
39
35
37
37
65
44
67
42
to
44
64
78
relative abundance of m/z 502 less than
3%,
40
retention time drifts (all peaks),
signal-related symptoms, overview,
temperature control disabled,
temperature control fault,
temperature symptoms,
45
the high vacuum pump is not ready,
the system is in standby,
the system is in vent state,
there is no emission current,
tuning-related symptoms overview for
CI MSD,
77
System ready signal,
228
T
Temperature sensors
GC/MSD interface, reinstalling,
GC/MSD interface, removing,
ion source, reinstalling,
147
ion source, removing,
145
mass filter, reinstalling,
149
mass filter, removing,
148
Thermal equilibrium, time to reach,
Toroid transformer,
224
Transformer, toroid,
224
Troubleshooting,
29
to 54,
57
air leaks, determining presence of
leak,
60
air leaks, finding location of leak,
common CI-specific problems,
See also Symptoms of malfunctions
tips and tricks, 30,
59
Tuning
cannot begin,
52
compound,
192
Turn on
failure of the MSD to,
31
U
Ultrasonic cleaning of ion source
parts,
138
V
Vacuum manifold
turbo pump version,
179
Index
36
68
50
50
to
46
51
51
51
52
156
154
213
61
58
275
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Table of Contents
Troubleshooting
