Electronics > Repair
[FIXED] Venerable AIM TTI PL303QMD-P needs help - Overvoltage trip error
Zucca:
--- Quote from: Gertjan on May 15, 2024, 09:03:49 am ---Shoot TTi support an e-mail. I found them friendly and helpful.
In a PM I will send you the schematics I got from them.
--- End quote ---
Gertjan, your post made me jump for joy on my bench, in my planet:
--- Code: ---IF schematics THEN device_value = device_value ^ 3
--- End code ---
So the legend is real! I was aware about the very nice and friendly TTi support, who are willing to release schematics, but never needed to (well it would have been my next step...)... this is also why I pulled the trigger on that sick puppy in ebay...
What a beautiful company! I will send them a message thanking them...
Finally someone who understand that releasing the schematics is a good thing to do!
One more reason to be proud to have ONLY AIM TTI Power Supply and DC load on my bench...
Back to my problem... not sure if you spotted it from my previous post...
this can't be right... wondering if this is the tragicomic culprit.
PS: For everybody who helped here, if you ever come in USA, SC... free beer on me day and night!
Zucca:
Yesterday night report:
1) schematics are like water in the desert!
2) the misaligned molex connector above I think it is on purpose... in the aligned position there is just more filtering for VC signal.
3) Both TIP31A base(=collector) in master/slave board are sitting at 0.58V
4) Both master/slave fans are spinning at the same speed, did not measured it. I assume if the PIC was in thermal protection mode the fan would blow with 100% PWM. It is not the case.
Tonight I will swap the power boards position and see where the error goes..
I bet the problem it is not in the power board.
Zucca:
Swapped power boards. Master stays in output trip.
Measured FAN voltage at master power board = 5.9V, which is about 50% PWM.
The power boards are fine as expected.
Next step swap the control PIC boards... stay tuned the circle is getting smaller.
Gertjan:
Hi Zucca,
--- Quote ---Measured FAN voltage at master power board = 5.9V, which is about 50% PWM
--- End quote ---
Normally, both fans are always rotating, but at very low speed (inaudible)
Only when the supply is dissipating a lot of power, the fans will spin up.
regards, Gertjan.
Zucca:
--- Quote from: Gertjan on May 17, 2024, 05:48:23 am ---Normally, both fans are always rotating, but at very low speed (inaudible)
Only when the supply is dissipating a lot of power, the fans will spin up.
--- End quote ---
Seems to be the case also in mine, even with output trip at the master.
Both fans are spinning low, looks equal and very quietly. I measure yesterday the one at the master and it was 50%PWM... which is about reasonable as lowest point.
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