Specifications

272 5975 Series MSD Troubleshooting and Maintenance Manual
Index
Detector focus lens, 211
Diffusion pump
effect of low fluid level in, 42
error messages related to, 48
Diffusion pump fluid
as a source of contamination, 54
Drawout plate and cylinder, 206
Drying cleaned ion source parts, 131
Dummy filament, 202
E
EI/CI GC/MSD interface. See CI interface
Electronics, 215 to 229
ac board, 220
ac-dc board. See low voltage power
supply
danger to from electrostatic
discharge, 87, 157
high voltage (HED) power supply, 224
LAN/MS control card, 223
locations of major components, 217
low voltage power supply, 224
main board, 219
maintaining, 157
part numbers, 233
power supplies, 224
signal amplifier board, 220
status display, 217
toroid transformer, 224
Electrostatic discharge
danger to the electronics from, 87, 157
precautions to take against, 132, 157
EM
See also Detector
See Electron multiplier
EM voltage, 212
Emission current, 204
if there is none, 52
End plate O-rings, 182
Entrance lens, 207
Error messages
difficulty in mass filter electronics, 47
difficulty with the EM supply, 47
difficulty with the fan, 47
difficulty with the HED supply, 48
difficulty with the high vacuum
pump, 48
foreline pressure has exceeded 300
mT
orr, 49
internal MS communication fault, 49
latched, 47
lens supply fault, 49
log amplifier ADC error, 49
no peaks found, 49
temperature control disabled, 50
temperature control fault, 50
the high vacuum pump is not ready, 51
the system is in standby, 51
the system is in vent state, 51
there is no emission current, 52
there is not enough signal to begin
tune, 52
translating error numbers into
messages, 47
ESD. See Electrostatic discharge
Excessive noise or low signal-to-noise ratio
in CI MSD, 74
Exhaust
oil trap for foreline pump, 175
F
Face seals, 182
Fan, for high vacuum pump, 191
incorrect operation of, 47
replacing, 114
Filaments, 204
care, 205
electron energy, 204
emission current, 204
parameters affecting, 204
reinstalling, 144
selection, 204
Foreline pressure
exceeding 300 mTorr, 49
too high, 42
too low, 43
Foreline pump, 175
effect of low oil level, 42
failure to turn on, 32
incorrect operation, 32
minimizing damage from ammonia
reagent gas, 166
power cord receptacle, 225
turned off during pumpdown, 32
venting the exhaust, 86
See also Foreline pump oil
Foreline pump oil
draining, 98
refilling the pump with, 100
replace every 6 months, 84
Foreline pump power cord receptacle, 225
Foreline trap. See Oil trap
Front panel. See Status Display
Fuses
on the back panel, 225
replacing the primary fuses, 161
G
Gas purifier, methane/isobutane
replacing, 167
Gauge controller
abnormal or blank display, 43
indicated vs. actual pressure, 195
power indicator does not light, 44
GC
components responsible for air
leaks, 53
does not turn on, 31
sources of contamination in, 54
GC interface. See GC/MSD interface
GC/MSD interface
failure to heat up, 46
maintaining, 153
reinstalling a heater and sensor, 156
removing the heater and sensor, 154
Grounded wrist strap, 87
H
Half-splitting, to find air leaks in CI
MSD, 62
Heaters
GC/MSD interface, reinstalling, 156
GC/MSD interface, removing, 154
ion source, reinstalling, 147
ion source, removing, 145
mass filter, reinstalling, 149
mass filter, removing, 148
HED, 211
difficulty with the HED power
supply, 48
HED feedthrough
seal, 183