Since I went to the rare effort (2-3 years) :) of unmounting my projector to give the lenses a bit of a clean. Are there any other recommended parts I should clean or mod before I stick it back up again. I did a G2 adjustment since it was way off. :)

Astig looks OK so I wont touch that.

I'm going to refocus and converge from scratch again.

Thinking maybe some common areas for dust build up when ceiling mounted. Preventative maintenance things, etc.


Thanks.

Fans and heatsinks.

Thanks, yes have cleaned the visible ones. There are a couple that are a little tricky to get to which I was going to leave unless you believe they are common problem areas.

If you have an air-compressor take it outside and give it a blast with that with the covers off, give the projector 24 hours to dry out as some compressors allow moisture through.

I just went and serviced a HT install with a 1252 that had not been touched since the original install. I upgraded the owner to HD (still inprogress) and noted the following:

-dust behind the lenses
-convergence off
-significant focus drift

THe owner was happy with the convergence alignment, I went to assess the set and gave him a quote before I'm going back to do the work today. He'll be tickled pink (6500 degrees ;)) when I get done.

There's 2900 hours on the set since about 1996.

Ooh yes - must get a Fury card one of these days. :)

Did you check the G2? - Even though (I assume) it was done before I bought the projector (~6 years) and sealed - R & G had dropped to <2v.

Smithnz.. Is your 1272 2nd generation?? Telltale signs would be stock HD-8 lenses and a ground wire coming from a resistor on the PA oard to usually one of the top fans. IF it is 2nd generation then the G2 voltage is 2.5v and NOT 4.0v.

Let me know your serial number, and if needed i can send you the revision to the service manual for the 2nd gen. 1272's.

Smithnz.. Is your 1272 2nd generation?? Telltale signs would be stock HD-8 lenses and a ground wire coming from a resistor on the PA oard to usually one of the top fans. IF it is 2nd generation then the G2 voltage is 2.5v and NOT 4.0v.

Let me know your serial number, and if needed i can send you the revision to the service manual for the 2nd gen. 1272's.

Sonynut,
I have a 1272 with serial #: 2000322, with the date of May 1996. Is this the 2nd gen you are talking about? If so, can you send me the revision to the service manual? It has the HD-8 lenses, and the ground wire from the PA board to the top right (looking at the pj from the front) fan.

I thought this model was also 4.0v.

thanks.

wallace

Wallace.. that serial number sounds a little low.. but the other details of course match. Here's the supplement for you and anyone else who may need it:). The supplement also has the serial numbers affected inside.

Unzip both files to the same location, then run part 1, and it will extract the full .pdf -- The .pdf was too large to upload, plus the forum does not allow .exe or .rar files, so I had to zip them.

Thanks for the file.

But, now I'm confused :confused: . All 3 1272's that I had all have serial numbers starting with 2000xxx, and all have a 1996 date on them.

The other 1272 I have has a serial number staring with 5000xxx and was made in 1994.

All 4 projectors have the ground wire from the PA board to a fan.

The pdf file talks about pjs that are from the 5001xxx and higher serial numbers.

Should the pjs with serial numbers 2000xxx be set for 2.5v?

thanks.

wallace

Wallace, where abouts is the date located on the 1272?

Wallace, where abouts is the date located on the 1272?

On the sticker on the side. The sticker also shows: SCC-D27D-A.

thanks.

wallace

Here's a pic of the tag:

http://i194.photobucket.com/albums/z295/wallace123456_crt/Serialnumberlocationon1272.jpg

Hmm.. Those really do seem to be a 3rd generation 1272(I remember you posting an extra connector on the top boards).. I somewhat wonder if they are a special-purpose model, since the serial numbers are so low also. I'd imagine the tubes probably had text burn that the gov't didn't want the public to see, and thats why they are gone also. Too bad they aren't there as maybe(spitballing here) they had a fast green for simulation or something.. but who knows. My best guess is since they share the same power supply with a 2nd generation model, that the G2 voltage would be 2.5v also.

EDIT: I just took a second look at the tubes in there with a '94 manufacture date.. did you put those in? Also does that say VPH-1272C/4 UC2? I think a call to SONY may be in order to see what these are..

Sonynut,
The tubes that you see in there came from another (my first) 1272 I have that I nought off flea-bay last year. Those tubes and pj is the one that has about 7,900 hours on it/them. I wanted to see if the pj that I got from the Gov. Liq site was any good (and, I wanted to see if I could successfully dismantle completly down to the case, clean, and rebuild a pj).

The picture (from what I can see without the lenses on) look clear.

Also, on all the 3 pj's I got from Gov Liq, there was a piece of tape over the G2 knobs and someone had written on the tape say, "Adjust to 4.0v only".

Also, these pjs have the KF board in them which from what I have read and been told, this is a clear indication that the pj is a later model (hence the 1996 date).

The extra connector on the E board has a pair of wires going to the PA board. I have read that this connector (wires) will hlp correct High Voltage Picture Bending. There is an actual adjustment that needs to be done on the E board.

Any thoughts?

wallace

*Scratches head*...

Not sure what to think about the 4.0v thing.. Is it hand written? If so, maybe they didn't know of the newer revision.. it only makes sense that a machine that new would be the same as a 2nd gen. I wish one of us had the even newer revisions including that KF board.

BTW, as soon as I have extra cash(since I don't have both a good blue and green for you) I still would love to have that 1272 you offered me, especially with that extra connector on the top board.. that's one of the things that drives me nuts in bright scenes. I have acquired another 1252, and a 1251, but the tubes in them unfortunately aren't really worth a darn.....

Not sure what to think about the 4.0v thing.. Is it hand written?

Yes, and the tape is old dried up masking tape.

I wish one of us had the even newer revisions including that KF board.

You mean one that works or hasn't been messed with?


BTW, as soon as I have extra cash(since I don't have both a good blue and green for you) I still would love to have that 1272 you offered me, especially with that extra connector on the top board..

It's still here, but I'll need to put it back together as I have been testing some of the boards with the pj that I rebuilt.

wallace

Cool! Hopefully soon I can rack up the cash to get one of them..:)

What I meant about the revision was a revision to the service manual explaining the new KF board.