CurtPalme.com Home Theater Forum

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

after just the blue and red, the red has grid lines the blue is just a rectangle no lines both are distorted, the red gets better with reg on the blue gets worse, the blue is in the greens place at the moment to test it.

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

code 30 says - 25 volts hi then no horizontal clamp.

The remote also says 300 for size on the picture if I go to green master size the vertical is fine though.

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

red with code 55 registration on

**AnalogRocks** · Posted: Wed Aug 22, 2007 6:49 pm Post subject:

Low Voltage power supply problems?

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

-23 v, is that for the lvps, I hope so!!

the manual just says operational error i wasnt sure which psu it was. never thought I would be happy about a error!

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

i replaced the fuse on the LVPS before on the +9 rail i wonder if the lvps has got a few problems. If it did would it cause the hum as well, I assumed the hum was a external factor but didnt get a chance to hook up another source before it all ent up in the air.

**AnalogRocks** · Posted: Wed Aug 22, 2007 10:09 pm Post subject:

Have you purchased your DMM meter yet? IF so power down the PJ and disconnect the mains then check the fuses with the meter set to Ohms and see if you have a blown fuse.

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

no dmm yet have to go out and get one, shall I just changed the fuse and give it a try?

**AnalogRocks** · Posted: Wed Aug 22, 2007 10:43 pm Post subject:

You could just thoguht if you had yer meter you could test it,

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Hi Incova. I have just read through your posts and first I have to ask you a question. Are you serious about wanting to fix this yourself. If the answer is yes then the first thing you have to get is a good DMM. Not expensive, just good. You cannot repair electronics without one unless its hit and miss, which is what you have been trying. After you have a DMM you must check all your voltages coming out of the LVSP. This is the first place to eliminate a problem, and the first place that causes multiple or strange problems. Your problem sounds like its in the registration board, which would cause shutdown, poor registration and unable to adjust registration, however the problem may not be the registration board but the voltage feeding it. This is why you need to verify all voltages coming out of the LVPS. Good Luck.

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

I had one of my friends bring a dmm last time macgyver, that time I had a fuse blown in the lvps which caused a whole set of problems as well. At first the problem was just hum in the picture, it then quickly got worse and here I am I have not been able to get a dmm just yet as I was not too sure on what sort of model to get. I am not that familiar with them tbh, I just got myself a video generator a while ago and wanted to build up my tools slowly, you know how it is. My mate who had the dmm is in Sacramento now and he does not remember what model he has.

Thanks for the post, I really enjoyed the picture of the pj when it was working and have every intention of fixing it, the reason I went through the other stuff was to try and isolate problems, I didnt know for sure it was a power problem either.

I will post back when I have the dmm should be in a couple of days or so.

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

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

No offense TSE, but ignoreing an error is not proper procedure for repairing electronics. Verifying the error is. He wants to learn how to repair his unit and wants guidance. The -25v does feed the CPU and registration, but the +25v feeds CPU, registration and HOT output, all of which could cause his problem of shutdown, poor registration and no registration adjustment, not to mention that a problem in the LVPS could also cause the hum bars he was getting. The correct thing is to check these voltages along with the other voltages coming out of the power supply to rule out a power problem.

I agree a cheap DMM is fine, go to radio shack and for about 20.00, your fine.

Again, no offense to you TSE!

**AnalogRocks** · Posted: Thu Aug 23, 2007 1:25 am Post subject:

I think you have just been told Scott. Wink

Why don't you introduce yourself to Mac here and let him know your credentials?

Welcome to the forum macgyver655. Smile

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Thanks for the welcome AnalogRocks. Although I have just registered and 1st post, I have been recieving Curts newsletters and occasionally reading the forums since his site first started. I have also had various conversations with Curt over the years but mostly concerning parts. As I stated, my post was by no means to be offensive to TSE, just to point out that incova's post's showed stress in trying to find the problem and just randomly poking around in there could just cause more problems then he started with, (as we all know to well, ZAP-ZAP). We all also know very well that a large percentage of problems start at the power supply, so he needs to check there first. I often find myself talking in tech language to a beginner who doesn't know it. We were all beginners at some time and always appreciate help. Apparently, in your post TSE has good credentials so I certainly did not intend to contradict him, only point out something. If my post was incorrect, then I welcome another opinion. I certainly don't want to start out here on a bad note, just figured I'd try to help since incova was getting so fustrated. Thanks again for the welcome.

jask · Joined: 17 Mar 2006 Posts: 10187 Location: kamloops BC

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Hi Jask. Sounds like I hit a nerve here. Maybe I should just go back to just reading here occasionally. I thought maybe other opinions would be helpful.The only thing I'm not sure of in your post is where you say I am wrong. Would you care to elaberate on that? Thanks

cbe317 · Joined: 14 Apr 2006 Posts: 214 Location: Thunderbolt, GA

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

Mac,
I don't think you hit a nerve, but Scott does know more about Ampros than anyone here. He worked for Ampro and designed a lot of the electronics in the pjs. If he can't fix it, then it is junk. Smile

I probably gave Z some ammo with that comment. Smile

Having spent time with him, I know he does have a special affinity for his Ampro babies. Smile

Now, if the Ampro owners would donate a 4600 to him then they might get a modded G90 or 909 killer. Laughing

jask · Joined: 17 Mar 2006 Posts: 10187 Location: kamloops BC