Printer loses connectivity after changing SNMP <Public> community name

When changing the SNMP <Public> community name, our RICOH Aficio SP C830DN printers lose their connectivity and go offline, EXCEPT ONE. That is the mystery. There is another RICOH Aficio SP C830DN almost next to the one that works, but it goes offline and when I did a side-by-side comparison of each printers configuration, the only discrepancy was in firmware versions and that the working printer's factory name had not been changed. Another printer with a higher firmware version had also gone offline, so I'm currently ruling out outdated firmware as a reason as to why all these printers go offline, except that one. And not being well versed in SNMP, I'm a little puzzled.

Is there a check list I should go through to identify what the working printer might 'being doing right', as opposed to the others. I'm also thinking there is a switch issue in here that I haven't considered, except all printers are on the same subnet.

Thanks in advance for any help.
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Spike99On-Site IT TechnicianCommented:
When you say you checked the printer's configuration, do you mean that you checked the internal settings for the physical printer?  Or, do you mean you checked the printer properties in Windows?
If you only checked the physical printer, I would also check the printer's properties in Windows to make sure that the SNMP community name matches the community name change you made on the printer.

Click on Devices & Printers.

Right click the printer in question, then click on "Printer Properties."
Click on the Ports tab
click on Port Properties
Verify the SNMP community name & device index match the setting on the physical printer

If the SNMP info is correct, what OS is the print server?

If it's a Server 2003 SP1 or later, there's a known issue with printers going offline when the printer doesn't respond as expected to SNMP commands.  
The server will place the printer in "offline" status until the print spooler or the server is restarted.
See the MS KB article on this:

One way to test to see if this KB applies in your case is to temporarily disable SNMP in the printer's properties. If the printer immediately goes back online, then you need to either keep SNMP disabled or apply the hotfix (which requires registry changes as well as the hotfix install).

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If Alicia's tip does not fix it, you can try unticking "SNMP status enabled" under Configure Ports.

SNMP is only used to let the printer report things like toner level to the driver. In most cases you do not need that.
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