Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 329
Main board:
F1 and F2 protect the ±24 V unregulated
power supply (see the power distribution
diagram). The following modules can blow
this fuse:
• Oven flap motor
• Oven fan motor
• Cryo valve
• Cooling fans
• AC board
• Internal valve drive
• All EPC modules
See the flow chart on page 1-327 for trou-
bleshooting blown F1/F2 fuses.
F3 protects the 7683/G2880A auto-sampler
power supply. If the auto-sampler tower is
dead (no lights), check the fuse. If it is
blown, disconnect the injector, replace the
fuse, restore power and check the fuse
again. Isolate the fuse blowing to the
sampler module or the main board.
Surface mount fuses - F4/F5 - protect GC
heated zone power supply. These fuses are
soldered to the main board and are not field
replaceable. If neither the inlet nor detector
zone is heating, check for errors under
status, and address any zone heater or
sensor problems. If there are no shorted
heaters or sensors, these fuses may be
blown. If so, replace the main board.
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