CurtPalme.com Home Theater Forum

Gary Murrell · Joined: 05 Apr 2006 Posts: 590 Location: Kentucky

hey guys

this is probably directed at Doug or Curt or Terry, Moome was speaking with me earlier and he needs to know the answer to a technical question, this is in regards to his upcoming HDMI card for the XG

Moome said there was 3 voltages at the NEC input slots, +5v, +12v and -12v, that he knows, but what he was wondering was what current is available on those voltages?

is there anyway anyone could possibly know this?

I have the full 1352 service manual, so if anyone thinks it would be in there and any tips where at I am all ears, lets help moome out so we can get rockin with them HDMI inputs Thumbs Up

thanks a bunch Thumbs Up

-Gary

Gary Murrell · Joined: 05 Apr 2006 Posts: 590 Location: Kentucky

humpty bumpty

-Gary

**Curt Palme** · Posted: Mon Sep 17, 2007 12:51 pm Post subject:

I don't think anyone knows the answer to this. Who knows how much leeway NEC or any other manufacturer built into their power supplies?

I'd say to be safe, no more than 100-150mA draw on each line.

dbaisey · Posted: Mon Sep 17, 2007 1:26 pm Post subject:

Gary,
I dont have the XG service manual in PDF or elect doc to send to Moome but the NR and NT connectors the cards plug into are on the DT PWB (PWC-4071A) will show the A values in the top left corner of page 15-8 of the 1352 manual. If someone has this on elect doc could you let me know or send to Gary or Moome.

This should be the same from his earlier version so Im wondering if he needs something else or actual running current. Doug

I agree Curt, never needed to know that.

Gary Murrell · Joined: 05 Apr 2006 Posts: 590 Location: Kentucky

Doug, I have the entire 1352 service manual, it's around 130mb, friggin massive

anyway I finally found your page and you are a hero sir, the service manual lists 5.8 or 8 amps of current(can't see exactly in the manual I have) for those 3 voltages, I have sent this info to moome

thanks again guys, appreciate the help Thumbs Up

-Gary

KennyG · Joined: 10 Feb 2007 Posts: 254

OK, I just opened my service manual and did a double check.
I had to use a magnifying glass, and I'm still not sure what this means...but what I read on all three voltage inputs is this:

5_8A

So does this mean 5 to 8 AMPS??? THat seems like allot of power for this circuit, I don't understand the use of a line down low between the 5 and 8, because it's certainly not a "dot".
I am going to look into the source components for this feed and see if they capable of this kind of output.

WTS · Joined: 08 Mar 2006 Posts: 1276 Location: Calgary

Somehow I doubt that NEC would list what the PS current capabilty is for any voltage output. How looking at what the fuse ratings are might give you an idea, but it won't tell you what the typical/max draw is on a supply voltage and whether you'll overload it or not.

dbaisey · Posted: Tue Sep 18, 2007 6:59 pm Post subject:

I would feel better about it if Moome had all schematics just to eliminate translation problems on what is needed and what he is looking for.
Also these readings are for three input board connectors. YC, NR and NT.
Gary if you have the link to the service manual can you send it to him. I know some of the online service manuals are not 100% complete. Doug

KennyG · Joined: 10 Feb 2007 Posts: 254

I'm having a hard time following this layout, and NEC's way of id'ing items from page to page...but this 5_8A is definitely NOT an amperage rating.
Many of these input/output arrows have this type of designation, just using different numbers and different letters (like 6_1B, or 4_3C)
The block diagram shows these circuits start as a 15v source that is then regulated on the board. No power ratings are given.

dbaisey · Posted: Tue Sep 18, 2007 10:24 pm Post subject:

Kenny and Gary,
Yes that cant be right. Had to look at it again.
I sent a e-mail to see if I can get a answer but I think I know what they will say.
I havent had to look at this PWC before. Moome should have the schematics regardless. Doug

KennyG · Joined: 10 Feb 2007 Posts: 254

Since we aren't going to get any engineering spec's on this, it would seem the best thing to do would be as we dicussed on the phone.
If Moome is using this to power his HDMI return circuit as you suspect, then just wire a second circuit, in parallel with the first. this will cause the circuit to draw close to double the amount of current needed in a "consumer" card. If the power supply holds up, then all is good...this assumes Moome has an XG to experiment on. (which you say he does)
I would be very surprised if the XG's power supply couldn't handle a HDMI circuit at double it's intended output, after all, that circuit is intended to power three possible input cards. (just not all at once) You'd think the engineers would have built it to handle almost anything...although, perhaps never thinking about a 25-50 ft cable run. Sad

dbaisey · Posted: Thu Sep 20, 2007 12:56 am Post subject:

Kenny,
Sent Moome a e-mail yesterday to make sure. Working on it but the new HDMI card will pull more then the DVI version. I dont think it will be a issue. Still trying for a more exact spec. Doug