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#28608 - 01/21/20 04:39 PM TAC50 Question  
Joined: May 2015
Posts: 286
wltr00 Offline
enthusiast
wltr00  Offline
enthusiast

Joined: May 2015
Posts: 286
I have a question regarding TAC50 Card Cage. My DSP board, EEPROM and PMI 4 board are all failing the go/no-go test. Sent them to Access and they said they all tested good and spun up a motor. I reinstalled them and get the same results. I checked my 12 VDC on the backplane and have nothing. It says the 12V comes from PS1 along with the 5V, but I cannot find anywhere to measure the 12V on PS1. My 5V is good. I also don't see in the prints for the power supplies where the 12V comes from PS1, only the 5V. Am I missing something? Is PS1 bad? Or is the backplane bad? I tried to measure the 12V on the other TAC50 controller that is running and also get no 12V on the backplane test point.

Any help is appreciated. Thanks

#28611 - 01/22/20 01:11 AM Re: TAC50 Question [Re: wltr00]  
Joined: Dec 2015
Posts: 1,528
Indirtwetrust Offline
ElevatorPractitioner
Indirtwetrust  Offline
ElevatorPractitioner

Joined: Dec 2015
Posts: 1,528
Local 18
Tac50 did away with the 12v. Only T3/T4. Try pulling every other board in the rack one by one until you find one that when removed is the only no-go in the rack. That is the bad board.


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