IET Labs, Inc. RLC Digibridge 1693 User And Service Manual page 141

Figure 5-1: Screws holding the interface assembly on the rear panel
5. If there is an interface option, remove it by
removing the two large screws (see Figure
5-1) and sliding the interface assembly out.
(If the panel held by these screws is blank,
leave it in place.)
Reassembly note: align the board contacts with the
internal connector, and push it firmly into position.
Refer also to section 5.5.2.
6. For access to the desired areas on top of the
main board, remove the power supply as
follows:
WARNING
Disconnect the power cord before
p ro c e e d i n g s o t h a t d a n g e ro u s
voltages will not be present on wires
and terminals that will be exposed in
the following steps.
A. Unplug the cable connecting the Power
Supply to the Power Switch.
B. Unplug the ribbon cable leading from
Voltage Regulator Board to the Main
Board (at J5).
C. Remove four screws at the corners of the
power supply.
NOTE: The obvious parts of this assembly are the
plastic bezel (at the very front), the subpanel (to which
the other parts are attached), the display board, the
display window in front of the board, and the key-
board module Behind and below the display board is
Service and Maintenance
the display connector board. Behind the keyboard is
the keyboard mount (a wide bracket with clearance
holes for cables).
D. Remove the two screws from the bnc-
connector bracket (or blank bracket,
whichever is at the front).
E. Remove the Retainer Bracket at the front
panel.
F. Disconnect the cables connecting the
Display Board and Keyboard to the Main
Board.
CAUTION
For reassembly, be sure that the
Keyboard cables are both oriented
with the white markings facing up at
the Keyboard and facing left at the
Main Board. On the two Display-Board
cables the red edges must face left.
G. Place a small spacer (such as a pad of
paper) under the chassis at each side, but
not under the front panel assembly.
H. Remove four screws (2 at left , 2 at right)
that pass through the sides of the chassis
(just behind the rear edge of the bezel)
into flanges of the subpanel. Pull the
Front Panel Assembly forward and tilt it
face down.
Notice that moving the bezel forward leaves the
POWER ON/OFF push rod unsupported at the front.
For reassembly, be sure to check that this push rod
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