Diagnostics and PCB and Assembly Replacement
Replacing a Fuse
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6-4 _______________________ Finnigan LTQ Hardware Manual _______________________
6.2 Replacing a Fuse
Fuses protect the various circuits by opening the circuits whenever
overcurrent occurs. On the MS detector the fuses are located on the Interlock
PCB and Source PCB. The function and current rating of the various fuses are
listed in Table 6-1.
Check fuses when power is lost to a fused subsystem.
CAUTION. Always shut down the system and disconnect the power cord
before you replace fuses.
Table 6-1. MS detector fuses
Location Fuse Circuit
Description P/N
Interlock PCB F1,F3 APCI vaporizer
heater
3.15 A, Type F, 5 x 20 mm, 250 V 00006-10510
Interlock PCB F2, F4 220 Vac
6.3 A, 250 V 00006-11450
Source PCB F3
4.0 A, 250 V 00006-11420
Caution. Use only the fuses specified in Table 6-1. Never replace a fuse
with a fuse of a different type, voltage, or current rating.
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