Table of Contents
Advertisement
7. To remove the keyboard module:
A. Remove the four screws (all with their
heads to the right) that hold the keyboard
assembly to the subpanel at the right and
the keyboard bracket at the left. Remove
this assembly.
B. To separate the keyboard, remove 4 screws
that pass through the mounting plate.
Reassembly note: Be sure that all keys and switches
of the keyboard are properly located in their holes
in the subpanel before tightening the four screws in
the subpanel and bracket. Also, plug the two cables
into the keyboard before attaching the front-panel
assembly to the chassis.
IMPORTANT: each of these cables plugs onto a
row of pins, without any keying. Be sure that the
cable is oriented correctly (with color marked
edges up at the keyboard and toward the rear at the
main board. Also be sure that each cable connector
engages its full set of pins and does NOT miss the
first or last one.
8. To remove the display board:
A. Remove the two screws that pass through
the display board, into spacers on the sub-
panel (not the two screws that fasten the
associated connector board). .
B. Slide the display board upwards, to unplug
it from the connectors below.
9. To remove the main board:
A. Disconnect the cables that connect this
board with display, keyboard, and power
supply. (See above.)
B. Remove the two screws from below that
attach the bnc-connector bracket (at the
front or rear panel).
C. Remove eight screws from above that
fasten the main board to the chassis and
the stiffener below this board. Note: One
of these screws is accessed after first re-
moving the air deflector (2 screws) near
the right rear air vent.
D. Remove the main board, forward and
upwards. If removal is obstructed by the
front-panel assembly, that can be removed
first. (See above.)
Service and Maintenance
5.5.1 Relocation of bnc Connector
Bracket
The bnc connectors that interface (via cables) with
the DUT test fixture can be located at the lower part
of either front or rear panel. The four bnc connectors
remain mounted on their bracket and cabled to the
main board during relocation from front to rear, or
vice versa. To relocate this bracket from front to rear:
1. Loosen generously (but do NOT remove) the
two right-side screws that fasten the front-
panel assembly into the chassis. Stand the
instrument on its right side. Remove the two
left-side screws that are opposite to the ones
just loosened. Now the front-panel assembly
can be tipped away from the instrument an
inch or two (as required in the next step).
Note: the display and keyboard cables remain connected.
2. Remove the blank bracket (2 screws) from
the rear bnc-connector position.
3. Remove the two screws that fasten the bnc
connector bracket to the main chassis, below
the front panel.
4. Holding the front-panel assembly tipped
away from the instrument slightly, snake
the bnc connector bracket between the main
board and the nearby part of the chassis, until
free from its front position. Return the front-
panel assembly to its normal position and
secure it with its two screws. If necessary,
loosen but DO NOT REMOVE the screws
holding the mother board.
5. Snake the bnc connector bracket carefully
into the rear position (where the blank bracket
was).
CAUTION
Handle the shielded cable assembly
w i t h c a r e a n d b e s u r e t h a t i t i s
dressed neatly, with a minimum of
twist or stress in its new position.
1693 RLC Digibridge
119
Advertisement
Table of Contents
