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5.4 DISASSEMBLY
If it becomes necessary to disassemble
the Model 706, use the
following procedure. Also, refer to Figures 5-1, 5-2 and 5-3.
1. Remove the top cover as follows:
WARNING
To prevent
a shock hazard, always
turn the in-
strument
off and disconnect
the line cord be-
fore removing
the top cover.
2.
3.
4.
5.
A. Remove the top two retaining screws located at the
rear of the instrument.
3.
Grasping the top cover at the rear of the instrument,
carefully pull it out and away from the instrument.
Remove the bottom cover in the same manner as the top
cover with one exception.
The four feet on the bottom
cover must be removed in order to remove the bottom
cover.
Remove the plug-in cards (see paragraph
22.2).
Remove digital I/O board as follows:
A.
Remove the two screws that secure the digital I/O
board to the mounting rail assembly
(706311).
B. Disconnect
the digital
I/O board from the mother
board.
C. ;:,"e
digital I/O board from the Model 706 main-
Remove the four decorative strips from the side panels as
follows:
A. From inside the mainframe, place a thin blade screw-
driver info one of the holes where the decorative strip
is secured. Refer to Figure 5-3.
6.
Carefully push outwards from the mainframe with the
screwdriver.
The strip will disengage
of one fastener
and then can be pulled away from the mainframe.
C. Repeat steps A and B for the remaining
decorative
strips.
D. To install the decorative strip, align the strip in the re-
cessed part of the side panel and press the strip at the
points of the two fasteners. This action secures the
strip in place.
6. Remove the power supply as follows:
A. Remove the three screws that secure the thermal
breaker shield to the supply and mounting rail. Refer to
Figure 5-3.
5.
Remove the ground wire from the power supply.
C. Remove the two screws that secure the power supply
to the side pane!. Carefully lay the supply on top of the
mounting rails.
D. Disconnect the Molex connectors for the AC input and
DC output wires of the supply.
E. Remove the power supply from the mainframe.
F. To install the supply, reverse the procedures of steps
A through E.
NOTE
When installing the power supply, make certain
that the jumpers on the input terminals are config-
ured for the available
AC line voltage.
Refer to
paragraph 5.3.
7. Remove the mother board as follows:
A.
5.
c.
D.
E.
F.
G.
H.
Disconnect the cable that connects the mother board
to the interconnect board (J/P 1020).
Disconnect the cable that connects the mother board
to the IEEE connector (J/P 1011).
Disconnect the cable that connects the mother board
to the digital I/O board (J/P 1009).
Disconnect the cable that connects the mother board
to the display board (J/P 1010).
With the bottom panel removed turn the Model 706 up-
side down and remove the six screws that secure the
mother board to the mainframe.
Remove the two power supply wires (+G) and (G) at
the supply. Remove the wire that goes to the +G inter-
connect hole.
Remove the mother board.
To install the mother board, reverse the above proce-
dure.
8. Remove the display board as follows:
A. Using a short Phillips screwdriver,
remove the four
screws that secure the display board to the front panel.
E. Remove the display board.
C. To install the display board reverse the procedures
in
steps A and 8.
9. Remove the interconnect board as follows:
NOTE
This procedure assumes that the mother board and
the power supply are removed.
A. Remove the three screws that secure the interconnect
board to the bottom mounting rail.
B. Remove the three screws that secure the interconnect
board to the top mounting rail.
C. Push the interconnect
board towards the front panel
and disconnect the IO shields from the shield fasten-
ers on the interconnect board.
D. Lift the interconnect board out of the mainframe.
E. To install the interconnect
board reverse the proce-
dure in steps A through D.
IO. Remove the rear panel as foflows:
A. Remove the four screws that secure the rear panel to
the mainframe.
8. The ALARM/SERIAL
IN, SERIAL OUT, EXT. TRIG-
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5-3
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