ABB SM3000 Manual de usuario

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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

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.

…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…

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

…ensuring that

membrane switch

flexi-cable passes

through slot in front

plate

Information. Refitting is the reverse of removal.

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

Remove jacking

screw circlip…

… nylon spacer…

…and jacking

screw, ensuring

nylon spacer

under head

remains on

jacking screw

3 4

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.

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 Limited

Howard Road, St. Neots

Cambridgeshire, PE19 8EU

Tel: +44 (0)1480 475 321

Fax: +44 (0)1480 217 948

ABB Inc.

125 E. County Line Road

Warminster, PA 18974

USA

Tel: +1 215-674-6000

Fax: +1 215-674-7183

ABB has Sales & Customer Support expertise in

over 100 countries worldwide

www.abb.com

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