In the year 2001 a Quartz Microbalance System (QMB) was installed in the remote area of the inner JET divertor to measure in-situ erosion and redeposition processes. When removed in 2004, the system was found to be coated all over with carbon deposits. The deposit on the "deposition-quartz" and the outer and inner housing was characterized by various analysis methods to obtain additional information on the layer properties and to compare with the results obtained in situ during the exposure. The layer thickness was determined to 1.85 ± 0.1mm in the average on an area of 0.95cm2 which must be related to the measured frequency change of 23640Hz , equivalent to 1.7¥10-4g. This corresponds to a carbon mass thickness of 9.3¥1018 C atoms/cm2. A significant deposition was also found on the surfaces inside the QMB housing which can only be explained assuming a high fraction of low sticking particles.