Thermo Finnigan LCQ Deca XP Plus, Hardware Manual

Page: 137 / 216

Service Maintenance
____________________________________________________________ Replacing a Fuse
__________________ LCQ Deca XP Plus Hardware Manual _________________
5-31
5.6 Replacing a Fuse
Fuses protect the various circuits by opening the circuits whenever
overcurrent occurs. On the MS detector, most of the fuses are located on the
System Control PCB. Several fuses, however, are located on the RF Voltage
Amplifier PCB, Analyzer Auxiliary PCB, and Power Module. The function
and current rating of the various fuses are listed in Table 5-5.
Check fuses when power is lost to a fused subsystem.
CAUTION. Always place the electronics service switch in the Service
Position (or shut down the system and disconnect the power cord) before
you replace fuses on the System Control PCB, RF Voltage Amplifier PCB,
or Analyzer Auxiliary PCB.
Table 5-5. MS detector fuses
Location Fuse Circuit Description P/N
System
Control PCB F1 Multipoles and tube
lens power supplies,
ion gauge grid 0.25 A, time lag, 5 x 20 mm, 250 V 00006-01700
System
Control PCB F2 Multipoles and tube
lens power supplies 0.25 A, time lag, 5 x 20 mm, 250 V 00006-01700
System
Control PCB F3 Ion transfer capillary,
multipoles, and mass
analyzer DC offsets 0.16 A, time lag, 5 x 20 mm, 250 V 00006-01700
System
Control PCB F4 Ion transfer capillary,
multipoles, and mass
analyzer DC offsets 0.16 A, time lag, 5 x 20 mm, 250 V 00006-01700
System
Control PCB F5 Ion gauge filament 3.15 A, time lag, 5 x 20 mm, 250 V 00006-10510
System
Control PCB F6 Ion transfer capillary
heater 3.15 A, time lag, 5 x 20 mm, 250 V 00006-10510
System
Control PCB F7 Conversion dynode
power supply 0.25 A, time lag, 5 x 20 mm, 250 V 00006-11204
System
Control PCB F8 RF detector power
supply 0.4 A, time lag, 5 x 20 mm, 250 V 00006-05080
System
Control PCB F9 RF detector power
supply 0.4 A, time lag, 5 x 20 mm, 250 V 00006-05080
System
Control PCB F10
F11 APCI vaporizer
heater 2.5 A, time lag, 5 x 20 mm, 250 V 00006-09510