Agilent Technologies 6890 Series Service Manual page 703

1220 Main Board, 6890A and 6890 Plus
Connector electronics
Connector electronics
The table on the following page shows the pinouts for some of the internal
connectors on the main circuit board that can be probed for diagnostic
purposes. These connectors are shaded on the diagram below. These
connectors are used for communications within the instrument. All connector
pinout drawings are viewed from the component side of the board.
Beeper
P11 P1
P12
GND
Oven Access
Cutout
P13
P17
3V
Lithium
battery
Figure 1220-2
2 of 10
P2
GND
DSP
Gate
Array
CPU
+5v
Gate
4 ROM
Array
Sockets
Main board connectors
Electrical
Agilent 6890 Gas Chromatograph Service Manual
P21
P22
P16
P15
J7
F2 F1
F4 F3
P19
+15V
–15V
Capacitors
Capacitor
P3
J1
J2
JP1
JP2
J8
J4
P18
Hole for
J6
Xfmr
cable
–24V
J5
+24V
Jun 2001