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Forums13
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Apr 9th, 2026
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Joined: May 2011
Posts: 487
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Joined: May 2011
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I keep getting 56 faults on a gearless TIV with a Magnatek drive. What are the common things that fire 56's?
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Joined: Feb 2013
Posts: 65
journeyman
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journeyman
Joined: Feb 2013
Posts: 65 |
Not getting de input, are you getting drive faults on drive? Also check power supply voltages, make sure they are on high side of suggested voltages. If that don't help we can go from there.
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Joined: May 2011
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F904 which is low line fault I believe. I think it's power related but can't prove it yet. Sometimes it traps people and/or I get there and it's OOS. I went over 1M, S, MCF, MFC relay contacts and connections. S and MCF had high resistance so I put in new relays. I pulled all the PCB's and re-seated them but had to leave for an entrapment. I'll check the PS voltages tomorrow. Thanks.
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Joined: May 2011
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I checked all the power supply voltages today, all were ok except the 5V was a little low at 4.970. I cranked it up to 5.012. Measuring at the DSP PCB test points, not the backplane. The car ran on CYC for +4 hours with no faults, but it's been known to crap out after 2 days of no problems.
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Joined: Sep 2012
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Crank up to 5.12, what slot is PMI 2 in? I think you have something else going on 56 and 904 on the drive are common faults not fatal. I maybe wrong without my notes but what does the smart fast say the state of the car is in when you have a entrapment. ###init?
Last edited by sbrmilitia; 03/15/13 03:48 AM.
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Joined: Sep 2012
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Also run the confindence test after you crank up the power supply, make sure everything is a go.
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Joined: Apr 2010
Posts: 101
Troubleshooter
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Troubleshooter
Joined: Apr 2010
Posts: 101 |
Something that is not done enough is checking for AC component on your power supply. Measure the DC then switch the meter to AC. Anything above 25mv is suspect on a regulated power supply. Once the capacitors dry out, it will introduce AC into your logic. Even cycle your CPU at 60 Hz.
Last edited by J Sand; 03/15/13 04:59 AM.
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Joined: May 2011
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Why do I always forget to check for AC component??? I guess because I'm used to working on old relay stuff..... Thanks , I'll crank up the 5V a little check for AC when I go back. Are the caps you're talking about are in the PS itself?
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Joined: Feb 2013
Posts: 65
journeyman
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journeyman
Joined: Feb 2013
Posts: 65 |
I always check voltage at back plane.... Habit, also there was a bulletin about those older power supplies that get funky over time...
Thanks J.
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Joined: Feb 2013
Posts: 65
journeyman
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journeyman
Joined: Feb 2013
Posts: 65 |
Also one more thing, does it have the old orange reverse phase relay on it...
If it does that might be suspect, as well. Carlo gavazzi, I think are the ones recommended to swap those out with... Thanks J.
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Joined: May 2011
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Not sure I know how to do the confidence test. I did the FLTP check on the PMIs and had no faults.
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Joined: May 2011
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Joined: May 2011
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Where at on the backplane?
I've never seen a VM not jumped.... yes they're orange. Which ones are the good ones to replace them with?
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HW PM
by Chris, January 13
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