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User name Jack
Log entry time 17:27:07 on April 24, 2009
Entry number 267935
keyword=Right Arm top VDC U-plane threshold
The Right Arm top VDC U-plane had a break in the threshold line. It was a
bad solder joint at the circuit board edges between amplifier cards
'UPPER U6' and 'UPPER U7'. The thresholds of U1 through U6 were all tied
together, but had a bad connection to the thresholds of U7 through U23.
The threshold power supply is connected to the U-plane near the U23
amplifier.