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User name Carlos
Log entry time 03:44:08 on October22,2004
Entry number 134940
This entry is a followup to: 134934
keyword=Controlled access
At around 1:30 MCC reported an expected downtime of at least 30min. We asked for controlled access to have a look at calorimeter block number 10. I called Alex. Alex and I went down. We checked there was no signal at the downstairs patch panel. Problem could be in either lemo cable coming from PMT or the PMT base. We opened the black box and changed the cable to another PMT and there was signal. We reduced the problem to the PMT base. We changed it by one of the spares (see entry 134934) and we saw (cosmic) signal. Back to beam permit at about 3:00. LED run was taken after the access to check all blocks. Beam is still not available when the access was finished.