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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Fri Oct 23, 2009 12:11 am Post subject: |
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The remote control display shows "VDC Display Systems" instead of Ampro Corp. There was a mod made to the beam current limit circuit, a small mod on the dynamic focus amplifiers, and the SMPS was reworked to run at 75kHz instead of 125kHz. That really lowered the power disipation in the snubber circuits and any of the switching components. That's all that I can think of.
Scott
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Oct 23, 2009 1:02 am Post subject: |
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So did any of these mods prove to increase performance or reliability?
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antorsae
Joined: 16 Jul 2006
Posts: 297
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| Posted: Fri Oct 23, 2009 7:43 am Post subject: |
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Blending two AMPROs.... "piece of cake" 
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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: Fri Oct 23, 2009 10:51 am Post subject: |
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| macgyver655 wrote: | | AnalogRocks wrote: | | Does an Ampro 4000 count? |
Sure, why not. Your still an official Ampro owner.....
Hey Chip. I thought you abandoned me. They were ganging up on me today...... 
Where's all the other Ampro owners out there. We know your out there. Dont be afraid to post..... Let the world know your glory....... |
Wait a second....I actually have 2 Ampro 4000's I forgot about the 2nd one. LMASO
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HD done right!
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Robert A. Hill
Joined: 19 May 2006
Posts: 182
Location: Simpsonville, SC
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| Posted: Fri Oct 23, 2009 2:39 pm Post subject: |
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| tse wrote: | The remote control display shows "VDC Display Systems" instead of Ampro Corp. There was a mod made to the beam current limit circuit, a small mod on the dynamic focus amplifiers, and the SMPS was reworked to run at 75kHz instead of 125kHz. That really lowered the power disipation in the snubber circuits and any of the switching components. That's all that I can think of.
Scott |
Scott, did the current limit circuit mod address restarts for "High Beam Current" alarms?
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Fri Oct 23, 2009 7:21 pm Post subject: |
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Nope, the mod is in the "dynamic" current limit circuit where when one or more colors hit a certain average current the video contrast is reduced to the point where that current is not exceeding the limit (which is about 1ma average beam current). If you monitor the contrast voltage for the RGB board you will see that it is almost constantly changing when there are brighter scenes happening.
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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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Fri Oct 23, 2009 8:19 pm Post subject: |
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| Robert A. Hill wrote: | | tse wrote: | The remote control display shows "VDC Display Systems" instead of Ampro Corp. There was a mod made to the beam current limit circuit, a small mod on the dynamic focus amplifiers, and the SMPS was reworked to run at 75kHz instead of 125kHz. That really lowered the power disipation in the snubber circuits and any of the switching components. That's all that I can think of.
Scott |
Scott, did the current limit circuit mod address restarts for "High Beam Current" alarms? |
There is a simple mod for the HVPS that delays the shutdown of the supply for a tenth of a second or so that eliminates alot of the false High Beam Current shutdowns.
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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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Fri Oct 23, 2009 8:22 pm Post subject: |
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| 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
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Thomas Jefferson
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Oct 23, 2009 8:49 pm Post subject: |
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| 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?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Oct 23, 2009 8:51 pm Post subject: |
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| tse wrote: | | Robert A. Hill wrote: | | tse wrote: | The remote control display shows "VDC Display Systems" instead of Ampro Corp. There was a mod made to the beam current limit circuit, a small mod on the dynamic focus amplifiers, and the SMPS was reworked to run at 75kHz instead of 125kHz. That really lowered the power disipation in the snubber circuits and any of the switching components. That's all that I can think of.
Scott |
Scott, did the current limit circuit mod address restarts for "High Beam Current" alarms? |
There is a simple mod for the HVPS that delays the shutdown of the supply for a tenth of a second or so that eliminates alot of the false High Beam Current shutdowns.
Scott |
Which remote failure readout is this for? HVPS restart or high beam current?
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sat Oct 24, 2009 12:17 am Post subject: |
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Ooops! You are right. High beam current message is generally displayed because too much current was drawn from the Spellman. This is usually caused by a bad CRT card or one of the tubes has a heater to cathode short (which means you probably have a bad CRT card, too).
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: Sat Oct 24, 2009 12:37 am Post subject: |
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So the mod is for HVPS restarts...... Do you have details? That one I would be interested in..... 
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Sat Oct 24, 2009 1:10 am Post subject: |
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| macgyver655 wrote: | | AnalogRocks wrote: | | Does an Ampro 4000 count? |
Sure, why not. Your still an official Ampro owner.....
Hey Chip. I thought you abandoned me. They were ganging up on me today......
Where's all the other Ampro owners out there. We know your out there. Dont be afraid to post..... Let the world know your glory....... |
I have a 4600. I've been through the help setup a few times now; it seems to drift. I thought I'd watch a movie then try again so that the internal temperatures are where they should be. 50 memories seems like a good idea; it also seems that maybe a lot of them is necessary? Just getting it figured out. The scheimpflug adjustment sets all three screws at at 1.5 turns then adjusts two only for balancing upper right to lower right and upper left to upper right. Obviously the upper right screw is not a decoration.
Any thoughts are good thoughts.
Thanks
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Oct 24, 2009 1:48 am Post subject: |
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| 416ray4538 wrote: | | macgyver655 wrote: | | AnalogRocks wrote: | | Does an Ampro 4000 count? |
Sure, why not. Your still an official Ampro owner.....
Hey Chip. I thought you abandoned me. They were ganging up on me today......
Where's all the other Ampro owners out there. We know your out there. Dont be afraid to post..... Let the world know your glory....... |
I have a 4600. I've been through the help setup a few times now; it seems to drift. I thought I'd watch a movie then try again so that the internal temperatures are where they should be. 50 memories seems like a good idea; it also seems that maybe a lot of them is necessary? Just getting it figured out. The scheimpflug adjustment sets all three screws at at 1.5 turns then adjusts two only for balancing upper right to lower right and upper left to upper right. Obviously the upper right screw is not a decoration.
Any thoughts are good thoughts.
Thanks |
Whats drifting?
There's 2 issues surrounding that 1 screw that is suppose to be at 1.5 turns and left alone.
1: It needs to be spring loaded to allow the lens to move when adjusting the other 2. If it was solid then the lens wouldn't adjust.
2: Keeping that 1 adjustment at 1.5 sets the lens depth with the tube or distance between the tube and lens. Changing the depth would make it more difficult if not impossible to get good focus over the entire projected image.
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Sat Oct 24, 2009 1:57 am Post subject: |
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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.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Oct 24, 2009 12:34 pm Post subject: |
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Did you null out all the settings before you began setup?
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Sat Oct 24, 2009 2:25 pm Post subject: |
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| macgyver655 wrote: | | Did you null out all the settings before you began setup? |
If you mean setting the electronic focus as per the manual first: yes. It just seems to me that if there one only position for the third screw why is it adjustable?
I suspect that the "drifting" is caused by variations in the signal from my POS player soon to be upgraded as soon as I make up my mind what to buy.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Oct 24, 2009 2:32 pm Post subject: |
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| 416ray4538 wrote: | | macgyver655 wrote: | | Did you null out all the settings before you began setup? |
If you mean setting the electronic focus as per the manual first:
No, thats not what I mean......
It just seems to me that if there one only position for the third screw why is it adjustable?
Then by all means, adjust away. Just dont come back and post....... why cant I get this to focus properly? Because I'll bust your balls until you say uncle......
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Sat Oct 24, 2009 7:45 pm Post subject: |
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Does the fact that Ampros hardly ever come up for sale mean that their owners are happy with them or to embarrassed to admit owning one? 
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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: Sat Oct 24, 2009 8:34 pm Post subject: |
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Hi my name's Jeremy. I've owned an Ampro for 3 years.....
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