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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sat Oct 24, 2009 11:23 pm Post subject: |
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| 416ray4538 wrote: | 1) Depending what's playing the red is noticeably to the left on the right of the picture.
2) I assume that 1.5 will be a function of the screen distance when optimally adjusted, not that I intend to find out for sure. I'll stay old school and follow the instructions but subtle adjustment seems tempting. |
"Depending on what's playing" ???
It sounds to me that you have more than one source playing on the same memory location. If so, of course it will drift.
That is why you have 50 memory locations. Each source should be assigned it's own channel. If you set it up for 1080I cable then feed it 1080P bluray it will be whacked for sure.
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Sun Oct 25, 2009 12:08 am Post subject: |
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That's kinda what I figured.
At the moment I'm trying to get the size to the max then move the projector a little bit closer to the screen 'till the picture fits the screen. Getting the picture centered on the face of each crt is proving to be a challenge. As I increase the size, the left looking into the crt overscans (ooooh, bad thing, push the other button) Pressing shift to centre the image seems like the right thing however at max shift the image hugs the left of the face (again, looking into the green crt)
In the interest of image quality I'm trying to use as much of the face as practical. Am I asking too much?
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sun Oct 25, 2009 11:41 am Post subject: |
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You have two controls to consider at this point. Shift (as you already know) and phase. Shift moves the raster around the tube face and phase moves the image within the raster. You will discover with that projector that the higher the scan-rate the more right shift you will need along with right phase. As you approach 1080P you will require almost full right shift to center the raster and full right phase. The Box 1020 with IAC (image alignment correction) sold elsewhere on this site will help with that problem. It will allow you to center the image before it gets to the projector. Alternately a scaler that allows you to tweak the settings will help. If you increase the brighness control, the raster in the background should become illuminated. Make sure no part of this touches the edge of the tube and is centered on the tube face using shift. There will be two corners of the raster that will be closest to the edge. Eye-ball them to be about 1/4 inch from the edge. Using a external test pattern, center the image within the raster. I like to set up projectors with the highest scan-rate I intend to use. Lessor scan-rates will fall into place. If set up at a low scan-rate you may find that you will run out of adjustment when you try higher ones.
A word of note: These instructions are in direct contrast to what I usually tell a newbee to crt installation. My generic response to someone learning a new projector is to practice setting it up at a lower scan-rate like XGA. These projectors were originally designed with these signals in mind and are very forgiving. Once you gain a full understanding of how the projector works, you can move on to higher resolutions with relative ease. Do not mount the projector until you are comfortable with it.
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Oct 25, 2009 4:17 pm Post subject: |
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| macgyver655 wrote: | | tse wrote: | | macgyver655 wrote: | | So did any of these mods prove to increase performance or reliability? |
The SMPS mod lowers the switching losses of the power mosfets, output rectifiers, and snubber resistors so they all run significantly cooler. It's a good reliability mod. The other mods addressed some small oscillation problems that happened after substituting some of the parts from the late 90's that are no longer available.
Scott |
Are these changes shown on the VDC SMPS schematics? |
Yeah, they should be on the schematics of the newer revision boards. It isn't just changing some small components, though. The output transformers were modified for the lower frequency so those have to be changed. That is key to the whole mod.
Scott
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"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 4:44 pm Post subject: |
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| tse wrote: | | The output transformers were modified for the lower frequency so those have to be changed. That is key to the whole mod. |
Yeah, kinda figured that.
I've been using the newest version of power mosfets and haven't had any of them fail yet. I think the mosfet failure was what was taking out the rectifiers.
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Sun Oct 25, 2009 4:53 pm Post subject: |
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| stefuel wrote: | You have two controls to consider at this point. Shift (as you already know) and phase. Shift moves the raster around the tube face and phase moves the image within the raster. You will discover with that projector that the higher the scan-rate the more right shift you will need along with right phase. As you approach 1080P you will require almost full right shift to center the raster and full right phase. The Box 1020 with IAC (image alignment correction) sold elsewhere on this site will help with that problem. It will allow you to center the image before it gets to the projector. Alternately a scaler that allows you to tweak the settings will help. If you increase the brighness control, the raster in the background should become illuminated. Make sure no part of this touches the edge of the tube and is centered on the tube face using shift. There will be two corners of the raster that will be closest to the edge. Eye-ball them to be about 1/4 inch from the edge. Using a external test pattern, center the image within the raster. I like to set up projectors with the highest scan-rate I intend to use. Lessor scan-rates will fall into place. If set up at a low scan-rate you may find that you will run out of adjustment when you try higher ones.
A word of note: These instructions are in direct contrast to what I usually tell a newbee to crt installation. My generic response to someone learning a new projector is to practice setting it up at a lower scan-rate like XGA. These projectors were originally designed with these signals in mind and are very forgiving. Once you gain a full understanding of how the projector works, you can move on to higher resolutions with relative ease. Do not mount the projector until you are comfortable with it. |
Thanks.
I have the 2220, but what's an extra box here or there. I'll get the 1020 ordered. You say my problem will only get worse when I buy a 1080p player so no point worrying about the position 'till then.
Thanks again.
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Robert A. Hill
Joined: 19 May 2006
Posts: 182
Location: Simpsonville, SC
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| Posted: Sun Oct 25, 2009 10:24 pm Post subject: |
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Hi Mac,
I assume these are in the non-potted section ofthe HVPS? What are the newest version of the power mosfets? Is the version identified on the mosfet itself?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 10:34 pm Post subject: |
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| Robert A. Hill wrote: | Hi Mac,
I assume these are in the non-potted section ofthe HVPS? What are the newest version of the power mosfets? Is the version identified on the mosfet itself? |
That conversation pertained to the LVPS. I know we keep going back and forth between the 2... 
The newer version is identified in the part number.
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Mon Oct 26, 2009 12:11 am Post subject: |
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My apologies if I have appeared to have hijacked this thread. I was responding to a cry for help from another Ampro owner. There just aren't enough to go around so we deal with the envy.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Oct 26, 2009 1:23 am Post subject: |
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| 416ray4538 wrote: | | My apologies if I have appeared to have hijacked this thread. I was responding to a cry for help from another Ampro owner. There just aren't enough to go around so we deal with the envy. |
No need to apologize. I didnt think you hijacked. All questions are welcome. Ask away......
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Oct 26, 2009 1:24 am Post subject: |
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| Robert A. Hill wrote: | Hi Mac,
I assume these are in the non-potted section ofthe HVPS? What are the newest version of the power mosfets? Is the version identified on the mosfet itself? |
Robert. Did you want the specific part numbers for replacement?
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Mon Oct 26, 2009 1:48 am Post subject: |
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| 416ray4538 wrote: | | stefuel wrote: | You have two controls to consider at this point. Shift (as you already know) and phase. Shift moves the raster around the tube face and phase moves the image within the raster. You will discover with that projector that the higher the scan-rate the more right shift you will need along with right phase. As you approach 1080P you will require almost full right shift to center the raster and full right phase. The Box 1020 with IAC (image alignment correction) sold elsewhere on this site will help with that problem. It will allow you to center the image before it gets to the projector. Alternately a scaler that allows you to tweak the settings will help. If you increase the brighness control, the raster in the background should become illuminated. Make sure no part of this touches the edge of the tube and is centered on the tube face using shift. There will be two corners of the raster that will be closest to the edge. Eye-ball them to be about 1/4 inch from the edge. Using a external test pattern, center the image within the raster. I like to set up projectors with the highest scan-rate I intend to use. Lessor scan-rates will fall into place. If set up at a low scan-rate you may find that you will run out of adjustment when you try higher ones.
A word of note: These instructions are in direct contrast to what I usually tell a newbee to crt installation. My generic response to someone learning a new projector is to practice setting it up at a lower scan-rate like XGA. These projectors were originally designed with these signals in mind and are very forgiving. Once you gain a full understanding of how the projector works, you can move on to higher resolutions with relative ease. Do not mount the projector until you are comfortable with it. |
Thanks.
I have the 2220, but what's an extra box here or there. I'll get the 1020 ordered. You say my problem will only get worse when I buy a 1080p player so no point worrying about the position 'till then.
Thanks again. |
You may want to consider a Box1040 instead. That will also give you component INPUT to your setup.
Box1020 is for RGB in and RGB/Component out. They both have the IAC circuits.
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Robert A. Hill
Joined: 19 May 2006
Posts: 182
Location: Simpsonville, SC
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| Posted: Mon Oct 26, 2009 4:44 pm Post subject: |
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Mac,
Yes, i would like the part numbers if you still have them. I would like to check on which versions are in my smps.
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Mon Oct 26, 2009 9:59 pm Post subject: |
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| macgyver655 wrote: | | 416ray4538 wrote: | | My apologies if I have appeared to have hijacked this thread. I was responding to a cry for help from another Ampro owner. There just aren't enough to go around so we deal with the envy. |
No need to apologize. I didnt think you hijacked. All questions are welcome. Ask away...... |
Now if Pete were here he could tell him everything he ever needs to know about AmPros 
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Mon Oct 26, 2009 10:40 pm Post subject: |
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I think Pete was an AmPro user that never came out of the closet...
Then again maybe Pete took one look at the AmPro and bought a digital.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Oct 26, 2009 11:07 pm Post subject: |
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| Tom.W wrote: | | Then again maybe Pete took one look at the AmPro and bought a digital. |
Your just so funny Tom.......
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Oct 26, 2009 11:50 pm Post subject: |
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| Robert A. Hill wrote: | Mac,
Yes, i would like the part numbers if you still have them. I would like to check on which versions are in my smps. |
Ok Robert, here's the scoop.
The original Ampro schematic for the newer LVPS's (meaning 3300,3600,4300 and 4600) called for a power mosfet with part number of IXTH12N100. This part was made by IXYS, a component manufacturer. Now every power supply I've worked on had the APT1001RBN made by advanced power technology and was a direct cross. These were most likely originals and Ampro probably used the APT instead of the IXTH because they probably got a better price on the APT's when the supplies went into production and when your talking thousands of parts, every nickel counts. I'm sure Scott could confirm this, maybe. Depends if he was there or not.
Now both those numbers are obsolete so the task to find replacement begins. I chose to search IXYS because they are still in business. I think APT sold out to microsemi but never bothered to confirm. Anyways I found that the IXTH12n100 was replaced by a IXFH12N100. This was also confirmed to me by IXYS engineering. This part is currently available at Digikey.
Now this part is around 18 bucks and the supply requires 2 so with shipping your looking at around 50 bucks.
So about 3 years ago when I needed 2 and the cheap person I am, I contacted IXYS looking for some free samples. I was told that they were no longer in production and there was a new replacement which would be IXFH12N100P but it was not released from engineering yet so I had to order samples. Some time later I received some samples and they have run fine. Engineering also told me the newer number was a more robust then the previous and the previous one was more robust then the original.
I occasionally check digikey for the 100P but didn't see them yet until when I just checked today, however it says they're not in stock and there is a minimum purchase of 90. However they are much cheaper in bulk. But they have the IXFH12N100 in stock.
Any questions?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Oct 26, 2009 11:56 pm Post subject: |
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Let me make one comment about my above post. When these mosfets blow, they ALWAYS take out many other parts. So don't anyone think they can just order these chips and pop them in and every thing is fine. You will blow out your 50 dollar investment instantly. If you need your supply repaired, contact Curt and he can fix you right up.... 
Just be happy that replacement parts are still available.... 
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed Oct 28, 2009 12:41 am Post subject: |
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| macgyver655 wrote: | | Robert A. Hill wrote: | Mac,
Yes, i would like the part numbers if you still have them. I would like to check on which versions are in my smps. |
Ok Robert, here's the scoop.
The original Ampro schematic for the newer LVPS's (meaning 3300,3600,4300 and 4600) called for a power mosfet with part number of IXTH12N100. This part was made by IXYS, a component manufacturer. Now every power supply I've worked on had the APT1001RBN made by advanced power technology and was a direct cross. These were most likely originals and Ampro probably used the APT instead of the IXTH because they probably got a better price on the APT's when the supplies went into production and when your talking thousands of parts, every nickel counts. I'm sure Scott could confirm this, maybe. Depends if he was there or not.
Now both those numbers are obsolete so the task to find replacement begins. I chose to search IXYS because they are still in business. I think APT sold out to microsemi but never bothered to confirm. Anyways I found that the IXTH12n100 was replaced by a IXFH12N100. This was also confirmed to me by IXYS engineering. This part is currently available at Digikey.
Now this part is around 18 bucks and the supply requires 2 so with shipping your looking at around 50 bucks.
So about 3 years ago when I needed 2 and the cheap person I am, I contacted IXYS looking for some free samples. I was told that they were no longer in production and there was a new replacement which would be IXFH12N100P but it was not released from engineering yet so I had to order samples. Some time later I received some samples and they have run fine. Engineering also told me the newer number was a more robust then the previous and the previous one was more robust then the original.
I occasionally check digikey for the 100P but didn't see them yet until when I just checked today, however it says they're not in stock and there is a minimum purchase of 90. However they are much cheaper in bulk. But they have the IXFH12N100 in stock.
Any questions?
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The APT parts were cheaper than the IXYS so Ampro went with them. I don't think there was a big difference in performance. I just checked DigiKey for their mosfet selection and saw the STW12NK95Z. It is a 12A part rated at 950V instead of 1000V like the originals but they are just a little over $4 each. That would be what I would order if I was replacing the SMPS mosfets. The nominal voltage, in circuit, is about 800V so still plenty of headroom. Lower on resistance and capacitance are a plus.
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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