Fluke PM6690 - Fan; Prescaler Options

–
Pull the interior unit out of the cover.
Reinstalling the Cover
–
Push the counter gently back into the cover.
–
Turn it upside down
–
Fit the two screws at the bottom.
–
Fit the two rear feet with their screws to the rear panel.
–
Fit the four decorative plugs.
Fan
–
Disconnect the power cable.
–
Remove the cover from the counter. See page 3-2.
–
Remove the four screws, nuts and washers that fix the
fan to the rear panel.
–
Disconnect the fan power supply connector from the
main PCB and remove the fan.
–
When reinstalling the fan, make sure the air-flow arrow
on the fan points to the rear of the counter and the black
wire is oriented toward the rear panel.
Prescaler Options
–
Disconnect the power cable.
–
Remove the cover from the counter. See page 3-2.
–
Disconnect the cable from the mini-coax connector on
the RF input.
–
Press the clips apart and lift the RF input PCA straight
up and out.
– When installing the RF input, make sure the connector
pins fit exactly in the holes of the connector housing.
Disassembly, Fan 3-3
Figure 3-4 The fan is fixed with four screws and nuts. The 3 GHz & 8 GHz prescalers are fixed with snap-in clips. The OCXO is sol
-
dered to the main board.
4 screws to remove
C
Figure 3-5 Remove the screws and pull out the main
PCB.