My handset has been dangaed and I want to fit a a new one with a switch. AP 30 cigweld

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• If both the STA and AP support channel change notification, the AP sends an action frame (802.11h) to the STA after the AP switches to a channel. The action frame is used to notify the STA of switching the channel immediately or after n Beacon intervals. The STA then switches the channel and retains online.
• If the AP supports channel change notification but the STA does not support channel change notification, the AP sends an action frame to the STA, notifying the STA of switching the channel immediately or after n Beacon intervals. The STA does not process the action frame, and goes offline after the AP switches to the channel.
• If the AP and STA do not support channel change notification, the AP switches to a channel and the STA goes offline.

S2300 Switch Thunder link com

their is a sensor on the side of the coil inside the machine and its possible this sensor is faulty or the thing has fallen off the coil

hi saluka.
not sure if this link will have the manual but have a look.
do not go into anything thats says fixya.it will not help you much.
Cigweld transtig 16 pi User manual Google Search

When you reset a handset (or if you buy a new one1, that handset displays a Handset Not Registered message. If you see this message on a handset, you need to register it to a base before you can use it.
Registering a handset
Does the handset fit in the base cradle?
Yes
No
Place the handset in the base.
The display should say Handset Registering.
1. On the base, open the menu and select Register Handset. The display should say Handset Registering.
2. On the handset you want to register, press and hold # until the handset display says Handset Registering (about 2 seconds).
In about 30 seconds, the handset display should say Registration Complete. Press TALK ( )/FLASh and make sure you get a dial tone.
27
If...
Try...
- you don't hear a dial tone- the display says Registration Failed
Making sure the handset is fully charged, then start over at step 1.
To register a handset to a different base, see the section "Expanding Your phone" in the user's guide for the other base.

check for a broken wire in the hand piece trigger and the connection at the end of the wire lead tube.

Sounds like corrupt firmware. If you can get to a page to update firmware, download the latest and go for it. If not, try reset again. If still ng, contact manufacturer or purchase a new AP.

Hope this helps!

Reason: Previous authentication no longer valid

This suggetss it has the wrong password or the wrong authenticaiton type (WEP vs WPA, for example)

Restore it to default, with these things, if it wont work on automatic, then something is worng.