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6-12
REMOVING AND
REPLACING THE REAR
PANEL ASSEMBLY
This paragraph provides instructions for removing and replacing the
rear panel assembly of the 690XXB/691XXB. The rear panel assembly
contains the A21 Line Filter/Rectifier PCB, the A21-1/A21-2 BNC/
AUX I/O Connector PCB, the line module assembly, and the fan as-
sembly. Refer to Figure 6-5 during this procedure.
Preliminary
Disconnect the power cord from the unit and remove
the chassis covers as described in paragraph 6-2.
WARNING
When power is removed from the instrument, always allow
five minutes for the capacitors on the A21 Line Filter/Recti-
fier PCB to discharge before removing the rear panel assem-
bly.
Procedure
Remove and replace the rear panel assembly as
follows:
Step 1
Using a Phillips screwdriver, remove the
screw on the top of the rear panel assem-
bly that fastens the rear panel assembly
to the bracket attached to the power sup-
ply housing.
Step 2
Turn the instrument upside down.
Step 3
Remove the three screws from the rear
panel assembly. (One screw fastens the
rear panel assembly to the bracket at-
tached to the power supply housing; the
other two screws attach the rear panel as-
sembly to the Motherboard.)
Step 4
Return the instrument to the upright po-
sition.
Step 5
Remove the screws attaching the rear
panel assembly to the chassis sides.
Step 6
Using a
7
16
-inch wrench, disconnect the
coaxial cables going to the rear panel
10 MHz REF IN
,
10 MHz REF OUT
, and
FM IN
(if installed) BNC connectors.
Step 7
Remove the power supply cover and set it
aside.
Step 8
Disconnect the cable assembly from the
A21 Line Filter/Rectifier PCB at connec-
tor P2 on the A19 PCB.
6-14
690XXB/691XXB MM
REMOVAL AND
REAR PANEL
REPLACEMENT PROCEDURES
ASSEMBLY
Содержание 680 C Series
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