Replacing The Oven Flapper Assembly - Agilent Technologies 7820A Service Manual

Replacing the oven flapper assembly

208
Agilent 7820 GC Service

Orient the motor such that its power cable exits towards
the electronic side of the GC

Reinstall the top nut first to support weight of the motor

After motor reassembly into the GC, check that its shaft
extends perpendicularly from the back oven wall. If not
perpendicular, there may be mounting part(s) missing or
misplaced, and/or mounting nut(s) untightened.

In fan replacement, make sure the fan's hub is returned to
its original location, or slightly rearward from being exactly
flush with the end of the motor shaft. Also make sure the
setscrew is tightened against the flat side of the motor
shaft.

After the oven heater/sensor shroud is reinstalled,
remember to return the plug of insulation in the access
hole at the back of the oven.
Components can be damaged by electrostatic
discharge (ESD). Be sure to wear a grounded ESD
strap while performing this procedure.
1 Remove rear GC cover.
Remove left side GC cover.
Disconnect flapper motor cable and pull it back to the motor.
Loosen three captured T-20 screws to remove the flapper
assembly. To support the weight of the assembly, the top-most
screw should be removed last.
Lift the assembly up, then pull the assembly straight out.
To replace the assembly, steps are the reverse of removal steps.
Install the top-most screw first to support the weight of the
assembly