3 of 10
Jun 2001
Electrical
Agilent 6890 Gas Chromatograph Service Manual
Main Board, 6890A and 6890 Plus 1220
Connector electronics
Table 1220-1 Main Circuit Board Pinouts
J7–AC Power P21–Inl/Det Htd Zones, man split valves
1 Heater 40 VAC (VIOLET) 1 Sensor GND
2 unused 2 Sensor GND
3 Heater 40 VAC (ORANGE) 3 Sensor GND
4 unused 4 Sensor GND
5 Heater Center Tap (GRAY) 5 Heater GND
6 unused 6 Heater GND
7 unused 7 Heater GND
8 Heater Center Tap (WHITE) 8 Heater GND
9 unused 9 +24 Volts
10 20 VAC (YELLOW) 10 +24 Volts
11 20 VAC Center Tap (BLUE) 11 FRONT INJ SENSOR
12 20 VAC (YELLOW) 12 BACK INJ SENSOR
P16–Oven sensor
13 FRONT DET SENSOR
1 Oven sense 14 BACK DET SENSOR
2 Ground 15 FRONT INJ HEATER
P17–Oven door switch
16 BACK INJ HEATER
1 Oven door 17 FRONT DET HEATER
2 Ground 18 BACK DET HEATER
P18–Inlet fan, oven flap, oven cryo
19 FRONT INJ +24V VALVE
1 Oven Flap Drive (WHITE) 20 BACK INJ +24V VALVE
2 Oven Flap Drive (BLACK)
P22–Valve box, Aux heated zones
3 Oven FLAP +24 V (WHT/BLU) 1 AUX 1 SENSOR
4 Oven FLAP +24 V (WHT/BLK) 2 AUX 2 SENSOR
5 Oven Flap Drive (BLUE) 3 HEATER GND
6 Oven Flap Drive (RED) 4 HEATER GND
7 Inlet Fan +24 V (ORANGE) 5 +24 Volts
8 Inlet Fan Drive (YELLOW) 6 +24 Volts
9 Oven Cryo +24 V (GRAY) 7 +24 Volts
10 CO2 Cryo Installed (VIOLET) 8 +24 Volts
11 N2 Cryo Installed (GREEN) 9 SENSOR GND
12 GND 10 SENSOR GND
13 Oven Cryo Drive (WHT/RED) 11 AUX 1 HEATER
P19–AC board control
12 AUX 2 HEATER
1 Oven Relay Drive 13 VALVE #1
2 Oven Triac Drive 14 VALVE #2
3 +24 Volts 15 VALVE #2
4 common w/ pin 2 16 VALVE #4
5 common w/ pin 1
12
32 1
65 4
98 7
12 11 10
12
113
1
5
1 8
916
Connects to:
G1530-60660
(Auxiliary Zone/Valve
Box harness)
1 10
11 20
Connects to:
G1530-60640
(Inlet/Detector harness)
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