HP 5890 SERIES II Service Manual page 315

P3.1 P_SENSB (B pressure sensing)
P3.2 +15VDC
P3.3 +5VDC
P3.4 ACOM
P3.5 P_CNTLB
P3.6 - 15VDC
P3.7 SHEILD
EPC PRESSURE TRANSDUCER MODULE
P1.1 +15VDC
P1.2 +5VDC
P1.3 ACOM
P1.4 P_SNS (pressure sensing)
EPC PROPORTIONAL CONTROL VALVE
pin 1 VLV DR (proportional valve control)
pin 2 SHEILD
pin 3 - 15VDC
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APPX A- 16