Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 328
The specifications for the DC power supplies are
noted in Table 1-3.
Table 1-3. Power supply specifications
*Unregulated supply - will fluctuate with AC
power line.
Blown fuses
The following is a list of possible causes for
blown fuses.
AC board:
F3 and F4 protect the GC oven circuit. Possible
cause:
• Shorted oven heater element at the hot
side
F1 and F2 protect the primary winding of the
main power transformer. Possible causes:
• Shorted primary winding. In this case,
replace the transformer.
• A wire from the main power switch or
primary transformer winding shorted to
ground. Could be due to cut insulation or
wire smashed under a screw (usually
after a repair).
Supply % tol Rated I (Fl) System PARD V pp
+24* ±10% 4.75 A < 1 V
–24* ±10% 0.75 A < 1 V
+15 ±5% 0.40 A < 250 mV
–15 ±5% 0.30 A < 250 mV
5 ±2% 4.5 A < 150 mV
40* ±10% 11.25 A (1)
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