ABB SM3000 User manual

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INFORMATION
No. INF03/75 Date: June 2008 Product SM3000 Multipoint Videographic Recorder
Manual IM/SM3000
SM3000
Membrane Switch Sub-Assembly Replacement
1Introduction
This information sheet describes the procedure for replacing the
SM3000 instrument's Membrane Switch sub-assembly, which
is an integral part of the Display Molding.
The Membrane Switch Sub-assembly Pack, GR2000/3710,
includes the following items:
Continued…
Withdraw the instrument
from the case
Remove tamper-proof
seal, if fitted
Unscrew the jacking screw
securing the instrument to
the case
3
1
2
Fig. 3.1 Removing the Instrument from its Case
Information. Refitting is the
reverse of removal.
2Tools Required
•Medium flat-bladed screwdriver
•No.2 Pozidriv screwdriver
•Small-bladed screwdriver or pointed instrument
3Membrane Switch Sub-Assembly Replacement –
Figs. 3.1 and 3.2
Caution. The instrument is vulnerable to
electrostatic damage. Wear an anti-static strap or dismantle
the unit on an anti-static workbench.
1) Isolate the instrument from the power supply.
2) Remove the instrument from its case – see Fig. 3.1.

2
…3 Membrane Switch Sub-Assembly Replacement – Figs. 3.1 to 3.3
3) Stand the instrument on a protective surface to prevent damage to the exterior finish and screen.
4) Remove the chassis from the display molding – see Fig. 3.2.
Fig. 3.2 Removing the Chassis from the Display Molding
Disconnect
membrane switch
flexi-cable from
main board
Pivot bottom of
chassis away from
moulding…
2
Lay instrument face
down on a protective
surface and remove
chassis securing
screws
(one each side)
Disengage lugs
from slots at top
of chassis and lift
chassis clear
of molding
1
…ensuring that
membrane switch
flexi-cable passes
through slot in front
plate
34
Information. Refitting is the reverse of removal.

3
6) Fit the items removed at step 5) to the new display molding
– see Fig. 3.3.
7) Refit the chassis to the display molding – see Fig. 3.2.
8) Refit the instrument to the case – see Fig. 3.1.
9) Restore the power supply to the instrument.
…3 Membrane Switch Sub-Assembly Replacement – Figs. 3.1 to 3.3
5) Disassemble the display molding – see Fig. 3.3
Remove screws
(2 off) securing
lower bracket
and remove
bracket
1Remove screws
(3 off) securing
upper bracket
and remove
bracket
2
Remove jacking
screw circlip…
… nylon spacer…
…and jacking
screw, ensuring
nylon spacer
under head
remains on
jacking screw
3 4
5
Information. Reassembly is the reverse of
disassembly.
Fig. 3.3 Disassembling the Display Molding
Note. When fitting the jacking screw,
ensure one nylon spacer is fitted below the
screw head and another below the circlip.

4
INF03/75 Issue 3
The Company’s policy is one of continuous product
improvement and the right is reserved to modify the
information contained herein without notice.
Printed in UK (06.08)
© ABB 2008
ABB Limited
Howard Road, St. Neots
Cambridgeshire, PE19 8EU
UK
Tel: [phone]
Fax: [phone]
ABB Inc.
125 E. County Line Road
Warminster, PA 18974
USA
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Fax: [phone]
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