How to disassemble a 7942 phone / clean hook switch

Hello,
does anyone have a guide how to disassemble a 7942/62 phone without damaging it?
Would be nice to know for example to clean the phone or to repair / replace hook switch.
Thanks,
Bernhard

Hi Bernhard,
I just took apart a broken 7942 to test the method, but
it seems like they may have changed the design at some point
as this one had 9 screws on the back and a plastic clip on the side
housing to the left of the Hookswitch. It seems like your 7942 may be
more like the method described here
http://atc.go0se.com/?p=1034
Cheers!
Rob
"When it comes to luck you make your own "
- Springsteen

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Feb 6 15:15:18.027: TFTP: Looking for SEP0023EBC81FB8.cnf.xml
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Feb 6 15:15:39.079: TFTP: Looking for SEP0023EBC81FB8.cnf.xml
Feb 6 15:15:39.131: TFTP: Looking for XMLDefault.cnf.xml
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Feb 6 15:15:40.455: TFTP: Looking for English_United_States/mk-sccp.jar
Feb 6 15:15:40.551: TFTP: Looking for United_States/g3-tones.xml
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cmterm_7936.3-3-20-0.loads instead of the 7942 loads.
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Feb 6 16:59:53.559: %LINK-3-UPDOWN: Interface FastEthernet0, changed state to up
Feb 6 16:59:54.559: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up
Feb 6 17:00:22.579: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to up
Feb 6 17:00:31.931: TFTP: Looking for term42.default.loads
Feb 6 17:00:31.935: TFTP: Opened flash:term42.default.loads, fd 0, size 662 for process 269
Feb 6 17:00:31.935: TFTP: Finished flash:term42.default.loads, time 00:00:00 for process 269
Feb 6 17:00:33.259: TFTP: Looking for term42.default.loads
Feb 6 17:00:33.259: TFTP: Opened flash:term42.default.loads, fd 0, size 662 for process 269
Feb 6 17:00:33.263: TFTP: Finished flash:term42.default.loads, time 00:00:00 for process 269 Feb 6 16:59:53.559: %LINK-3-UPDOWN: Interface FastEthernet0, changed state to up
The phone then reboots hangs for several minutes than repeats with the same event logs. .
Any help that can be offered would be greatly appreciated.
Thank you
John

I have tried what you have suggested and got the following results.
Phone without factory reset.   firmware - 8-3-2-27 no apparent change
Feb 7 16:32:37.425: %LINK-3-UPDOWN: Interface FastEthernet0, changed state to up
Feb 7 16:32:38.425: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up
Feb 7 16:33:06.445: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to up
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Feb 7 16:33:10.345: TFTP: Looking for SEP081FF3621B99.cnf.xml
Feb 7 16:33:10.393: TFTP: Looking for XMLDefault.cnf.xml
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Feb 7 16:33:10.405: TFTP: Finished flash:XMLDefault.cnf.xml, time 00:00:00 for process 169
Feb 7 16:33:17.317: TFTP: Looking for cmterm_7936.3-3-20-0.loads
Feb 7 16:33:32.549: TFTP: Looking for CTLSEP081FF3621B99.tlv
Feb 7 16:33:32.649: TFTP: Looking for SEP081FF3621B99.cnf.xml
Feb 7 16:33:32.697: TFTP: Looking for XMLDefault.cnf.xml
Feb 7 16:33:32.697: TFTP: Opened flash:XMLDefault.cnf.xml, fd 0, size 3814 for process 169
Feb 7 16:33:32.709: TFTP: Finished flash:XMLDefault.cnf.xml, time 00:00:00 for process 169
Feb 7 16:33:34.361: TFTP: Looking for English_United_States/mk-sccp.jar
Feb 7 16:33:34.529: TFTP: Looking for United_States/g3-tones.xml
Phone with factory reset - firmware 8-3-1-22 - I tried 3 phones. 2 with unknown firmware as the phone had already been factory reset and onwe with the firmware listed above. 1 had one of the unknown phones work the other two are giving me the events listed below and then reboots for the same process.
Feb 7 17:07:22.289: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up
Feb 7 17:07:50.305: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to up
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John

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How to disassemble a 7942 phone / clean hook switch

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