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macgyver655
Joined: 22 Aug 2007
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Fri Mar 13, 2015 12:02 am Post subject: |
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thank you very much for all the help  this is much appreciated
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Mar 13, 2015 12:10 am Post subject: |
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Sure thing.
Now one more thing. And listen to this carefully.
When you get all the parts and have them installed....... DO NOT TURN ON THE PROJECTOR UNTIL YOU GET BACK TO ME.
Don't even plug it in. I want this machine started a certain way. I will explain later after the repairs.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Fri Mar 13, 2015 12:39 am Post subject: |
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I will do this, I'll probably have the parts somewhere next week.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Mar 13, 2015 7:36 pm Post subject: |
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One more thing before I forget. Test those new resistors before you install them. Hopefully they wont be to far off spec..
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Sat Mar 14, 2015 12:36 am Post subject: |
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| macgyver655 wrote: | | One more thing before I forget. Test those new resistors before you install them. Hopefully they wont be to far off spec.. |
what do you mean by offspec? if i get the 75k ohm 2 watt resistors i should be getting the right ones, not?
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Sat Mar 14, 2015 1:44 am Post subject: |
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problem: i need to know the ESR and the tolerance of the capacitor that i need to get.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Mar 14, 2015 2:35 am Post subject: |
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| Luuk neele wrote: | | macgyver655 wrote: | | One more thing before I forget. Test those new resistors before you install them. Hopefully they wont be to far off spec.. |
what do you mean by offspec? if i get the 75k ohm 2 watt resistors i should be getting the right ones, not? |
There is a tolerance rating on resistors. So when you get the new ones they may not measure exactly 75kohm. Just how far off will be the question. So measure them first before installing them to see just how far off they are. Hopefully it will be an acceptable amount.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Mar 14, 2015 2:36 am Post subject: |
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| Luuk neele wrote: | | problem: i need to know the ESR and the tolerance of the capacitor that i need to get. |
Not critical by any means so just pick.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Sat Mar 14, 2015 12:05 pm Post subject: |
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What is acceptable tolerance for this application? 5% or so?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Mar 14, 2015 2:32 pm Post subject: |
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| Luuk neele wrote: | | What is acceptable tolerance for this application? 5% or so? |
Depends if your talking about the cap or the resistor.
And before you answer that, think about the question a little and then post your thoughts on a answer to your own question.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Sat Mar 14, 2015 7:35 pm Post subject: |
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the answer is probably "as low as possible"
i ordered the resistors (which have a 1% tolerance and are 75k ohm and 2 watt)
i ordered the tantal 2.2uf but they lacked 35v so i ordered 50v, this should be fine because higher voltages dont really matter.
its just the max voltage the cap can have before it fails.
as a replacement for the lm320t-12 i have contacted TI, they advised me to use the LM7912 (TO-220) which also has -12
so i ordered that along with the required fuses.
parts should be here somewhere next week, ill put them in and contact you mac, before i do anything else.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Wed Mar 18, 2015 1:56 pm Post subject: |
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parts should arrive today, i'll get them in tonight and post back here again.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Wed Mar 18, 2015 7:28 pm Post subject: |
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| macgyver655 wrote: | Sure thing.
Now one more thing. And listen to this carefully.
When you get all the parts and have them installed....... DO NOT TURN ON THE PROJECTOR UNTIL YOU GET BACK TO ME.
Don't even plug it in. I want this machine started a certain way. I will explain later after the repairs. |
hey mac,
i got all parts, and i've installed them in their places. waiting on your input before i do anything else.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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mac
Joined: 07 Nov 2012
Posts: 143
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| Posted: Wed Mar 18, 2015 7:30 pm Post subject: |
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Did you recheck the short status with your DMM after installing the RGB board?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Wed Mar 18, 2015 8:08 pm Post subject: |
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| mac wrote: | | Did you recheck the short status with your DMM after installing the RGB board? |
i did, it reads .435 on the -20v line, so no short there.
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