HP 5890 SERIES II Service Manual page 310

P12 EPC/MPC PCB CONNECTOR
P12.1 BD0
P12.2 BD1
P12.3 BD2
P12.4 BD3
P12.5 BD4
P12.6 BD5
P12.7 BD6
P12.8 BD7
P12.9 GND
P12.10 *EXT_IN2
P12.11 *EXT_OUT2
P12.12 *EXT_OUT0
P12.13 *EXT_OUT1
P12.14 *EXT_OUT8
P12.15 +5V
P12.16 +5V
P12.17 9.8304MHz
P12.18 GND
P12.19 GND
P12.20 GND
P12.21 GND
P12.22 GND
P12.23 D240
P12.24 POP
P12.25 +15V
P12.26 - 15V
P12.27 +10VREF
P12.28 COMMON
P12.29 DAC2
P12.30 ATTN2 ( goes thru R5 to RCDR2 of P5 )
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