430 Power/Electronics Replacement
Replacing the main board
6 of 26
Jun 2001
Mainframe
Agilent 6890 Gas Chromatograph Service Manual
Figure 430-5 Screw locations on the main board (6890A/Plus board shown.
6890N is the same.)
9. Holding the main board by the metal bracket at the top left and the
capacitors at the bottom right, slide it slightly to the left and pull it out
of the instrument being careful not to catch the board on any wiring
harnesses.
10. Installation of the new board is the reverse of this procedure.
Caution Changing the board loses the GC serial number.
Cutout
Hole for
transformer
Oven Access
Cutout
Beeper
P11 P1
P2
P12
P13
P17
GND
P15DSP
Gate
Array
CPU
GND
4 ROM
Sockets
3V
Lithium
battery
Gate
Array
P16
P21
P22
P3
J1
J2
JP1
JP2
J4
J6
J5
F2
F1 F4
F3
P18
+24V
–24V
+15V
–15V
+5v
Capacitor
Capacitors
cable
J8
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