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#571843 05/17/14 07:57 PM
Joined: Jul 2003
Posts: 1,219
davetel Offline OP
OP Offline
Joined: Jul 2003
Posts: 1,219
over the last few years i have encountered several sts ksus locking up. display comes up but with no sync message. default sometimes helps but some just wont come back up. my question is does this mean it is a software problem and the rest of the ksu is good. thanks dave

davetel #571855 05/18/14 12:33 AM
Joined: Jan 2008
Posts: 3,819
Retired Moderator
Retired Moderator
Joined: Jan 2008
Posts: 3,819
My experience has been that this is caused by one of two things...power supply going bad (-5 volts) or the ram battery is starting to fail.
It is easy to test the battery. Take a meter to it and make sure it has over 3 volts when the power is off. There is no test for the -5 volts. When it goes the unit will start clicking like crazy.

Last edited by Derrick; 05/18/14 12:34 AM.

"Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about"

Retired, taking photographs and hoping to fly one of my many kites.

Moderated by  EV607797, JWRacedog, MnDave, nfcphoneman 

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