Good morning folks. Does someone have any step by step instructions on how to mod the fan on a Sony 1272q projector?

Thanks.

I wrote instructions on here a looonng time ago. It included replacing the fans with quieter versions and then putting a zener diode inline with them to bring them down off full speed. The 1252 I did it to was so quiet you could barely hear it - was quieter than my desktop PC. Never had an issue with temperature.

I wrote instructions on here a looonng time ago. It included replacing the fans with quieter versions and then putting a zener diode inline with them to bring them down off full speed. The 1252 I did it to was so quiet you could barely hear it - was quieter than my desktop PC. Never had an issue with temperature.

Will your mod work for a 1272? I'll look for it. :)

Thanks.

In my old 1272q (now in the capable hands of Sonynut) I had Chuck Williams install his fan speed mod circuit, which starts the fans off at normal speed (to eliminate any stall possibility) and then ramps them down to an adjustable level after 2 or 3 seconds. Worked like a charm.

In my old 1272q (now in the capable hands of Sonynut) I had Chuck Williams install his fan speed mod circuit, which starts the fans off at normal speed (to eliminate any stall possibility) and then ramps them down to an adjustable level after 2 or 3 seconds. Worked like a charm.

Did it become quiet?

Thanks.

It is nice and quiet. I will trace down the ramp circuit as soon as I get the chance and see if I can figure out what makes it tick :).

For the 8 years I had the 1272q, the only thing I was less than satisfied with was the fan noise. Chuck's mod circuit took away that irritation well. I'd still have it now if I hadn't been seduced by the CIH world. ;)

Just putting a zener in line with them will not stall them in any way shape or form, it will just slow them down off of full speed, so they are quiet. Works with the 1252, 1272, 1270, etc. The only 12XX series I didn't test it with was the 1292. Simple and cheap fix.

It is nice and quiet. I will trace down the ramp circuit as soon as I get the chance and see if I can figure out what makes it tick :).

Thank you so much! :) Where have you been master? How is your stack going?

I couldn't find it quickly in the archives, but the circuit is noted here (along with a post by Keith reiterating that you only need a zener diode)

http://biobug.org/ht/pj/sound.php

(I'm amazed that Google has already indexed this thread.)

I do note that the diagram doesn't include any variable resistors, which was definitely part of the circuit as Chuck constructed for mine. Perhaps Sonynut can use this as a starting point and document the changes.

This one uses a 33 ohm resistor for the slow speed of the fans and a timer to run a bypass transistor of the 33 ohm resistor to start the fans on high.
This can be done with a simple relay and a cap to either delay the open or close of the relay.

nice support! ;)

I couldn't find it quickly in the archives, but the circuit is noted here (along with a post by Keith reiterating that you only need a zener diode)

http://biobug.org/ht/pj/sound.php

(I'm amazed that Google has already indexed this thread.)

I do note that the diagram doesn't include any variable resistors, which was definitely part of the circuit as Chuck constructed for mine. Perhaps Sonynut can use this as a starting point and document the changes.

Thanks for the link. :)

So would that mean that I can keep the existing fans?

EDIT: I just read the link and he bought fans. :)

I bought fans as well. I had to twist Chuck's arm a little bit to install them, because he didn't think the swap would be needed after installing his circuit. We did, though, and he was quite surprised when they made a noticeable difference in addition to the speed ramp circuit.

I bought the fans from DigiKey. I gave my spares to Sonynut along with the projector - perhaps he can post the model number (I don't have it handy anymore.)

In the end it was also fun to hear the fans come up to speed and then quiet way down every time I turned on the projector. It was really very quiet in the end. Not as quiet as my VW-100 is now, but it was about as quiet as my previous Vidikron VPF-40S.

I bought fans as well. I had to twist Chuck's arm a little bit to install them, because he didn't think the swap would be needed after installing his circuit. We did, though, and he was quite surprised when they made a noticeable difference in addition to the speed ramp circuit.

I bought the fans from DigiKey. I gave my spares to Sonynut along with the projector - perhaps he can post the model number (I don't have it handy anymore.)

In the end it was also fun to hear the fans come up to speed and then quiet way down every time I turned on the projector. It was really very quiet in the end. Not as quiet as my VW-100 is now, but it was about as quiet as my previous Vidikron VPF-40S.

That's great to hear. I have to ask my friends to look at the diagram. I don't understand the schematic. :(

Do you still have the list of items you bought for the mod? Do you recall how much it cost your?

Try this post: http://www.curtpalme.com/forum/viewtopic.php?p=33686&highlight=#33686

wallace

I don't have the numbers for the fans any more. I do know that they were Panaflo 80mm, but that's all the information I can extract from my archives. The Digikey website database no longer has my order on file, and the email confirmation I have archived didn't include the order details. I only ordered the fans... since I was already having Chuck Williams in to perform routine maintenance on my 1272 I just paid him to build one of his ramp circuits and install it while he was here. This was in 2006.

Try this post: http://www.curtpalme.com/forum/viewtopic.php?p=33686&highlight=#33686

wallace

BAM! I like it because you posted pictures. :D That will help me a lot for sure. I'll have to buy a pulley and strong rope first so I can bring this beast down.

Thanks for sharing. :)

EDIT: Do you still have the list of what you bought? Did you buy them at RadioShack?

I don't have the numbers for the fans any more. I do know that they were Panaflo 80mm, but that's all the information I can extract from my archives. The Digikey website database no longer has my order on file, and the email confirmation I have archived didn't include the order details. I only ordered the fans... since I was already having Chuck Williams in to perform routine maintenance on my 1272 I just paid him to build one of his ramp circuits and install it while he was here. This was in 2006.

Thanks for helping me as well. I will try Wallace's route first.

BAM! I like it because you posted pictures. :D That will help me a lot for sure. I'll have to buy a pulley and strong rope first so I can bring this beast down.

Thanks for sharing. :)

EDIT: Do you still have the list of what you bought? Did you buy them at RadioShack?

I don't have a list off hand, but I'll find the parts this weekend. There are a couple more things I did that really helped with the noise. I'll get all the things I did, put them in a list along with the parts and post them.

wallace

I don't have a list off hand, but I'll find the parts this weekend. There are a couple more things I did that really helped with the noise. I'll get all the things I did, put them in a list along with the parts and post them.

wallace

Yes wallace, this is no rush. But I am very happy now that I will finally be able to minimize the fan noise. :D

Thank you so much again! :)

I did the fan mod with the stock fans, putting a 5 volt zener inline with each one and it virtually eliminated the noise. Very simple and cheap. I punched some extra intake holes in the front of the power supply housing to cut down the turbulence noise there also. No problems with overheating. I'll send pictures if you like.

jkruger, I don't think he's looking for easy or cheap at this stage. /-=

I did the fan mod with the stock fans, putting a 5 volt zener inline with each one and it virtually eliminated the noise. Very simple and cheap. I punched some extra intake holes in the front of the power supply housing to cut down the turbulence noise there also. No problems with overheating. I'll send pictures if you like.

Sure please. Have you tried it playing for continuous 4 hours without shutting down? As long as it works, I'm all for that. :D Where did you buy the 5 v zener inline?

I left it running for 48hrs one time with no issues at all. Some days it runs for 8-10 hrs nonstop.

You can usually order most parts from Partsexpress.com

I left it running for 48hrs one time with no issues at all. Some days it runs for 8-10 hrs nonstop.

BAM! Send me the pics please. Do you recall how many we have to mod?

You can usually order most parts from Partsexpress.com

Thanks too. :)

I bumped the previous post that has pictures..... there are five large fans and one small one. Radio shack sells the zeners in a 2-pack. They can go anywhere in the red or black wire. Just make sure you have the polarity correct. The pictures show the zeners in the red wire with white shrink wrap on the connections. Link:
http://www.avsforum.com/avs-vb/showthread.php?t=929842

Thanks. I'll look at it now.

Just putting a zener in line with them will not stall them in any way shape or form, it will just slow them down off of full speed, so they are quiet. Works with the 1252, 1272, 1270, etc. The only 12XX series I didn't test it with was the 1292. Simple and cheap fix.

Looks like jkruger is out right now. :)

So is the zener I bought from RadioShack fine? I want to do it tonight. :p

Here are the specs:

Voltage: 5.1V
Current: 49mA
Max Power dissipation: 1.0W <- this could be 1 watt I guess since there is also a 1 watt printed on the packaging

Yes wallace, this is no rush. But I am very happy now that I will finally be able to minimize the fan noise. :D

Thank you so much again! :)

Geez. Watching you guys threads on this topic, helll, I learned a bunch! I especially like the velcro idea as this will get the fan and any vibration off the projector for sure.

wallace

Velcro works well... Kills almost all of the vibration noise. BUT.. getting the fans to stay in place is another issue. Make sure to hold them from 2 sides somehow so they do not fall out. I did this to my original 1272. The velcro holds well... the glue for it.. thats another thing.

Did you use the "industrial strength" Velcro?

Did you use the "industrial strength" Velcro?

Yes, I did. I posted many pictures on the other thread started by jkrugger. You will see the velcro's there. I need to fix the velcro though near the control panel. I built it too small.

I'm really in love with it now since I can turn my master volume at -32db. I can hear the whispers now on movies. :D

Oh, I got the industrial velcro at Home Depot.

Geez. Watching you guys threads on this topic, helll, I learned a bunch! I especially like the velcro idea as this will get the fan and any vibration off the projector for sure.

wallace

Yes, I just thought about it because I used it before on my bookshelf speakers and the stand. It holds pretty well. Then with the fan we have on our projector, it's somewhat becomes isolated because it's just the string that is attaching to the other piece. I was really able to get rid of high pitch vibration going to the chassis/body.

Here is what I posted at jkrugger's thread.

~~~~~~~~~~~~~~~~
Here is another update folks. :D I'm very sure next week, I'll be very lazy. So I decided to finish everything before I go to sleep. ;)

Again, I'm very happy with the results after removing the screws on the fans on the power supply as well as putting velcro to hold it. However, I added rubber insulation so that it doesn't really touch the power supply case. I used the one that we put inside the ON/OFF switch during winter. It's the one we put to prevent cold air from coming out on those switches.

Using this approach, I was able to remove the high frequency sound vibration that was being generated(I guess) by the sound that's being transfered to the power supply case.

And based my observation, I could hardly hear the fans from 5 to 6 ft. Before, I can hear this jet from like 15 ft away.

Anyways, here are more pictures.

Notice the color off-white on the case. This will prevent the fan from touching the metal. Also check out the small rectangular velcro on the side of the fan that I attached. I put that so that it won't touch the side metal case as well. The rubber adhesive is about .5mm thick. Then the black part is like .5mm to 1mm thick. It was a bit tight when I was pushing it down.
http://img513.imageshack.us/img513/53/fanvelcro1ho6.jpg

just a close-up of the velcro on the side
http://img165.imageshack.us/img165/5607/fanvelcro2ep0.jpg

After I was able to put it in position, I added the rubber pad on both sides again.
http://img208.imageshack.us/img208/5452/fanvelcro3wp3.jpg

Of course, the right fan had the same fate. :p
http://img113.imageshack.us/img113/1654/fanvelcro4zt5.jpg

I noticed that the black plastic was touching the 2 fans. So I put the offwhite rubber pads again. :D
http://img337.imageshack.us/img337/4719/fanvelcro5zg9.jpg

and for the 2 fans near the control, I remove all the screws, installed velcro again and relocated that metal piece. I attached it to the tube as shown near the arrow.
http://img442.imageshack.us/img442/9323/fanvelcro6tq0.jpg

and some more pictures

http://img511.imageshack.us/img511/1973/pscase1ia2.jpg

http://img337.imageshack.us/img337/3516/pscase2zy3.jpg


oh, this is the small fan at the back. This is also producing high pitch vibration. I also added the diode and double sided adhesive. It's tough to put velcro in there.

http://img521.imageshack.us/img521/4425/smallbackfansl1.jpg

http://img521.imageshack.us/img521/5086/sidefanjn5.jpg

http://img217.imageshack.us/img217/2415/sidefanmountingplaterj6.jpg

WTF? Velcro? Glue? Tape? I thought everyone knew about these:
http://www.pccasegear.com/index.php?main_page=product_info&products_id=1697

I find similar things in old Dell computers from the dumpster.. most of them have at least four if not eight inside. They work great.