October 5th 2006Jacques Lefrancois1 Cable Repair ADC side: Problems Miniature connector neededMiniature connector needed Nicomatic or ATI previously used with KX3B cable But halogen-free cable has bigger diameter=> more difficult cabling Two main problems:Two main problems: When all the ground braid is not carefully laid outside the connector body, the crimping of the ground cylinder on the body is of poor quality: the connector can become loose or the cable pulled out slightly loosing contact. The same symptom can happen if the crimping tool was not closed completely If the stripping length of central isolator and central wire length was not observed exactly the signal contact can be recessed and make an intermittent contact with the electronic card connector.

October 5th 2006Jacques Lefrancois2 Repair technique The contact is measured by a reflected pulse technique while retracting the 8-cable connector by 1.2mm: the bad contacts are labelled and all the individual coax are separated from the 8- coax plastic holder. The bad contacts are cut awayThe contact is measured by a reflected pulse technique while retracting the 8-cable connector by 1.2mm: the bad contacts are labelled and all the individual coax are separated from the 8- coax plastic holder. The bad contacts are cut away The shrinking tube is cut away and the ground tube crimping on the connector body inspected: if a movement is possible, the connector is cut awayThe shrinking tube is cut away and the ground tube crimping on the connector body inspected: if a movement is possible, the connector is cut away New connectors are cabledNew connectors are cabled New shrinking tubes are put onNew shrinking tubes are put on The cables are remeasuredThe cables are remeasured

October 5th 2006Jacques Lefrancois3 Number of repairs 2400 ECAL cables were inspected in the first two weeks (3 persons)2400 ECAL cables were inspected in the first two weeks (3 persons) 800 HCAL and 2600 ECAL were inspected in the next two weeks (4 persons)800 HCAL and 2600 ECAL were inspected in the next two weeks (4 persons) The replacement rate is about 50%!The replacement rate is about 50%! One more week (4 or 4.5 persons) is needed to finish the remaining 1000 ECAL+ 800 HCALOne more week (4 or 4.5 persons) is needed to finish the remaining 1000 ECAL+ 800 HCAL Tentative date SeptTentative date Sept

October 5th 2006Jacques Lefrancois4 Conclusion CONNECTORS ARE NOT EASY TO MOUNTCONNECTORS ARE NOT EASY TO MOUNT CONNECTORS ARE FRAGILECONNECTORS ARE FRAGILE