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Post by mastertech on Mar 23, 2017 22:21:23 GMT -5
That should of been fine. Well now I am thinking ic902 is bad. Try your other one. Check the gnd of pin 6. Make sure it has continuity with hot gnd..
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Post by mastertech on Mar 23, 2017 22:25:36 GMT -5
Gotta go. I'll check back tomorrow.
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nashou
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Post by nashou on Mar 23, 2017 22:26:42 GMT -5
That should of been fine. Well now I am thinking ic902 is bad. Try your other one. Check the gnd of pin 6. Make sure it has continuity with hot gnd.. It has gnd . Done for the night . Will try that tomorrow . Had feeling it's dead with no voltages on other pins . |
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nashou
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Post by nashou on Mar 25, 2017 18:05:11 GMT -5
Well I Haven't swapped it out yet but I did test each pin resistance and compared it to the new chip. it seems fine to me.
Do you think maybe the board needs to be installed in the chassis with all connectors in play?
I still have ic902 out. is there any test i can do resistance wise or with the diode to the pads? I did resistance and looked over the board schematics carefully and it all seems good, that is resistance to GND seems fine
if I follow the traces and see what parts each pad goes through to each GND .. could one of the coil/xfmers be bad?
Nashou
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Post by mastertech on Mar 25, 2017 18:42:06 GMT -5
Change ic902.
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nashou
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Post by nashou on Mar 25, 2017 20:03:37 GMT -5
Ok replaced. Should I replace the resistor and remove the DC PS connections and try with the jumper on the Connector and check for the 12 volts on the power pads for the two ic's? |
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Post by mastertech on Mar 25, 2017 20:24:29 GMT -5
No. Leave external supply connected and set at 12v. We may even have to raise it some.
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nashou
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Post by nashou on Mar 26, 2017 18:45:27 GMT -5
Ok, Treied at 12.25 and same thing , no voltage on pins
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nashou
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Post by nashou on Mar 26, 2017 18:57:46 GMT -5
YAY!!! Tried bumping it up till the 400vdc came up and we got it to turn on at 12.52 VDC !!!
Now why aren't we getting the 12.5 volts off T904?
Nashou
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Post by mastertech on Mar 26, 2017 19:10:32 GMT -5
I think it may actually suppose to be @ 15vdc.
Did you happen to check to see if you had the 12v and 24v outputs?
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nashou
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Post by nashou on Mar 26, 2017 19:16:52 GMT -5
Yes I just checked they are there !!!
Ok Lets get this done !!!
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Post by mastertech on Mar 26, 2017 19:19:48 GMT -5
Good. Now leave everything connected the way it is and put D908 back in and see if the voltage on it's cathode is still the same.
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nashou
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Post by nashou on Mar 26, 2017 19:26:26 GMT -5
Good. Now leave everything connected the way it is and put D908 back in and see if the voltage on it's cathode is still the same. 5.85 volts on cathode side. is the suppose to be that or higher? the 12, 24 and 400 are all there with this set up. nashou |
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Post by mastertech on Mar 26, 2017 19:32:00 GMT -5
No, not ok. This is where it should be @ 12-15vdc. Did you replace C969. D908 tested ok, right? No leakage?
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nashou
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Post by nashou on Mar 26, 2017 19:36:02 GMT -5
C969 is still in place. And D908 tested fine with DMM reading one way .457 and no leakage OL the other. and the anode side voltage is 0. But I'll double check.
But I did read the uf for C969 and it was 35 uf but I'll change it out anyhow.
Nashou
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