CurtPalme.com Home Theater Forum

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

hi macgyver655 thanks for the comments about the power supply it was useful and by no means did I take offence nor do I think did Scott, I was frustrated because I had after many hours and months got the Ampro working very well. I am good with a few things on crts but the Ampro is very different to my Barco and this is the first time I am checking voltages. I did manage to do great astigmatism on the ampro though so I am not a complete novice on setup!!

Any advice is helpful as far as I am concerned all the best. Smile

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

**AnalogRocks** · Posted: Fri Aug 24, 2007 12:14 am Post subject:

Sorry Mac, didn't mean to slite you but I guess I did use your post as a sort of a joke. I do that. I am a jackassakass. But as Jask ( no relation Wink

) said. We need more technical opinions here. That way some people can actually get their projectors running instead of scratching their heads or rather beating them against the wall.

Fell free to jump into the greattest un-moded forum I've seen.

Wlecome to the dark side.

Heavy breathing not required.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Thanks for the posts guys. Didn't want to step on anybodys toes. More then happy to help out if I can. I figured I've spent the last 25 yrs. repairing television's and projector's and expanding my knowledge base, so maybe its time to give some back and help some others out. Figured maybe I'd enjoy it. So I'll be here in the background doing some reading and maybe jump in occasionally to give my 2 cents, LOL. Glad to join a friendly site. Thanks again.

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

Hi gents had to take a break for a while a couple of health issues took over.

I was about to start measuring the fuses in the projector and had just put it on when I realised that the projector seems to be making a very strange sound as far as the power is concerned. As far as I know from what I have read in other posts once the pj is on the sound from the current should be consistent. On my pj the there is a really strange sound from the current I turned the lights of to check for arcing but didnt see any, however, the sound is like a fizzing sound from near the splitter. I wish I could better describe or record it. Its like the current is meeting resistance then discharging every few seconds, so instead of a consistent load and sound there is a very strange sound from the pj. I remember speaking to Macgyver about this a while ago I will try to record the sound and see if you guys make anything of it before I go further.

This is the mm I finally got,

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

I got it for $30 or so it seemed a good deal but I really am still trying to work it all out.

I assume the black is the grounding cable and should go into the chassis to earth the mm the red is the probe. IN order to measure the 300 vdc on the mb and 1000 from the neckboards how should I ground myself and where would I put the leads on the mm. My assumptions are that the mm should be turned to 1000 where it says v- and the red lead should go into the far bottom right red V and the black where it says com.

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

to measure the fuses I intend to do it like this.

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

I wont do anything until I get the green light from you guys Scott ! I just got better I have no intention of getting worse, thanks for the quick reply.

**Curt Palme** · Posted: Wed Oct 24, 2007 6:16 pm Post subject:

Leave the meter leads connected to the common and the 'ohm' connection.

Chances are the meter has a 'beep' function. Use it to check the fuses. Make sure the set is unplugged completely.

Ray Cendroski · Joined: 22 Apr 2006 Posts: 68 Location: Concord, Ohio

Regarding your comment about the fizzing noise around the splitter:

I had a splitter go bad on my 4200. I suddenly started getting a sustained blue corona arc around the tops of the three lead connectors. It was a god awfull scary thing to watch in the dark - like something out of a grade B Sci Fi movie. The whole basement filled with the smell of ozone (like rotting eggs).

I cut out all the potting rubber in the splitter, and re-filled it with liquid resin fiberglass that they use for auto repair. If I remember correctly, it had a higher dielectric contstant that did silicon rubber. I then covered everything with a thick layer of silicon rubber, and it's been fine for about 5 years.

Ray

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

Ray thanks for the info although I think I would prefer a new splitter if thats the case! Curt I assume its the 1st pic you are referring to, I dont understand though, you want me to check the pj fuses and have the pj unplugged, does it not have to be on? Confused

Apologies, I am not a electrician and am struggling to get a grasp of this and I may just get a electrician in at this rate! Embarassed

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

Hi, good to have you back. Sorry that I couldn't spend more time earlier. That work thing.

With your meter you will probably never need to use the 10A and mA input jacks. Almost all troubleshooting will be done with the volts or ohm functions. It is easy to damage the meter using the amp fuctions.

It's been a while. Why don't you give a little review on the projector problems that you are having.

Scott

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

great to be back Scott, thanks it took me a while to get back on my feet but now that I am I want my pj working.

Ok, basic problems on the pj are the same as before so I will recap. The splitter is making some very strange noises which I have attempted to record but with no success. The current just does not seem to be going through it consistently it just makes a strange noise every few seconds like zzzzzzzzzzpt.

I cannot use any external inputs as the pj seems to shut down after a while, I have used the internal test patterns which produces a very strange grid pattern on the red and weird pattern on the tube in the middle.

Um, the tubes still have strange output the tube on the blue side has no output, I have already swithed the tubes around and its that side that wont work. All the tubes have distorted images, well the two tubes with output anyway. I am still in the process of isolating the problem which is why I have the dmm. Unfortunately I also do not have a electronics background which is why Scott and others are trying to make sure I dont get zapped. I cannot say I am happy about using one of these but live and learn eh.

I dont want to muck around to much as I really do not want to do some damage to the tubes so I will wait until I get enough information to get the most amount of information back before I proceed.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Hey Incova, Just got back from vacation and saw your post. The first thing you need to do is find and fix that zzzzzzpt noise. Checking voltages and poking around will do you no good until you fix that. So find that problem first and then we can respond with the next procedure.

TSE meant, check the fuses to see if they are blown with the projector off. To check voltages you will have the projector on and running but not before you fix that arcing. Good luck.

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

ok, the arcing, just how do I fix it I can hear it but cannot see it even in the dark, I should have a mp3 of it in the next couple of days although I dont know if this will help. I take it you want me to isolate the point of the arcing as best as I can ?

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

First, You said you think its coming from the HV splitter so we will chech there first. Make sure the projector is off and unplugged. Disconnect the HV lead from the HVPS going to the splitter. Plug projector in and turn it on. Do not put your hands in projector while doing this. Has the noise stopped? Turn projector off and unplug.

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

ok, I did what you said and the noise has indeed stopped the tubes had no power of course. projector is now of and unplugged, thanks Macgyver.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

OK, now you have to change the splitter. Do you have one?

incova · Joined: 27 Nov 2006 Posts: 789 Location: london

I dont have one here and it may take a while to get another one, are there any other parts or things I could test meanwhile?