5

A7CN/A7CN-L

Safety Precautions

Environment

• Do not use where gases are generated (ammonia, chlorine, sulfur

dioxide).

• Although Switches are of nearly dust-proof construction, they are

not drip-proof, therefore do not use in areas subject to water or oil

exposure and do not operate with wet or oily hands.

• Provide additional dust-proofing measures, such as using a dust-

proof cover, when using in sand-exposed areas.

Handling

• The A7CN cannot be connected to the A7C.

• The molded components of the Switch use polyacetal resin and

polycarbonate resin. It is recommended that alcohol is used to wipe

off dirt and smudges from the molded components. Take care to

prevent the alcohol from getting inside.

Do not use thinner or other solutions which might damage the resin.

• When changing settings, do not touch the operating buttons if your

fingers are wet or there is oil or any other foreign substance on your

fingers.

• Do not drop the individual Switches. Doing so may damage the

resin catch (for connecting) on the side of the Switch.

• When separating Switches, use a screwdriver as shown in the

figure below; disconnect them by releasing the top and bottom

hooks. Be careful not to bend the hooks.

• When connecting Switches, fit the mating parts together.

• Do not push the (+) and (-) operating push-buttons at the same

time.

Models with PCB Terminals

Do not use excessive force in handling the Switches. In particular,

take care to avoid dropping them because the terminals might bend

or break.

Screw-mounting Models

Tighten mounting screws to a torque between 0.2 to 0.24 N·m, using

M2.6 screws. Use plain washers or spring washers together with the

screws.

Setting Numbers

Locking Type

• Set with the setting button by raising it.

• Return the button to its original position

after setting. It is then locked to prevent

rotation, and the set numbers will not

change accidentally.

Soldering

Note the following points when soldering

printed circuit boards:

• The terminal insertion holes on the PCB must be at least 1 mm in

diameter.

• Automatic Soldering

Do not use dip cleaning. Doing so may result in flux penetration of

the Switch interior, causing contact and rotational defects. Clean

the flux as shown in Figure 1, tilting the Switch 80

° or less and using

a brush to apply the solvent only to the back of the board. It may

also be cleaned by dipping only the back of the board into the

solvent and then using a brush to clean.

• Dip Soldering

When applying flux solvent, the dipping time is a maximum of 2

seconds. As shown in Figure 2, avoid flooding the top surface of the

printed circuit board with flux. Using a brush to apply flux further

reduces the danger of flux penetration. When cleaning flux with a

brush, tilt the Switch 80

° or less, as shown in Figure 1, in order to

prevent flux from flowing onto the switch mounting surface. Clean

flux as described above under Automatic Soldering.

• Using a Soldering Iron

Use a 30-W soldering iron at a temperature of 350

°C for a

maximum of 3 seconds, and flush as described above.

Do not apply force to the terminals during soldering and for 3

minutes after soldering is completed. Doing so may result in

conduction or operation failure.

• Ensure that soldering flux and alcohol do not penetrate into the

Switch interior

Precautions for Correct Use

Do not

push here

Top surface

of board

80

° or less

Back surface

of board

Wipe away flux

with a brush.

Figure 1

Figure 2