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Jun 2001 11 o f 2 4

Contents

Agilent 6890 Gas Chromatograph Service Manual

Removing the injection port fan..............................................................16

Removing the keyboard ...........................................................................17

Removing the pneumatics area fan.........................................................18

Chassis mounted fan.........................................................................18

Bracket mounted fan ........................................................................19

420 Oven and Temperature Control

Heated zones................................................................................................1

Oven ramp rates ..................................................................................1

Configuring the GC for an MSD.........................................................2

Oven temperature troubleshooting...........................................................3

Testing resistance of the heater coil.........................................................4

Cryo valve installation/replacement.........................................................5

Installing a new cryo valve.................................................................5

Replacing an existing cryo valve.......................................................7

Replacing the oven shroud assembly .....................................................10

Replacing the oven sensor .......................................................................13

Replacing the oven fan .............................................................................14

Replacing the oven fan motor .................................................................15

Replacing the oven flap motor ................................................................17

Converting the oven type .........................................................................19

Configuring the oven ........................................................................19

430 Power/Electronics Replacement

Replacing the main board ..........................................................................1

Installing an MIO card (6890A and 6890 Plus) .......................................7

Replacing ROMs on the main board (6890A and 6890 Plus) ...............11

Removing a ROM...............................................................................11

Inserting a ROM.................................................................................12

Replacing the battery................................................................................13

Replacing the pneumatics board.............................................................14

Replacing the PCB bracket ..............................................................15

Replacing the transformer—GC serial number < 10225 ......................17

Replacing the transformer—GC serial number ≥ 10225 ......................19

Replacing the ALS Interface Board.........................................................23

Agilent Technologies 6890 Series Service Manual

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