Hi Trodas,
I'm just drafting a post offline about recapping and or converting an old Intel D975xbx2 to poly caps. Hopefully by the end of this day I should have cleaned and finished the draft and posted it up on "Motherboards with Bad Capacitors > All Others Motherboards" forum for people to read and comment on. As a noobie I'll be asking about possibly jumping from electrolytic to polymer caps and what to look out for, as well as suggested replacements for EOL caps. So please keep an eye out for my D975XBX2 post.
This is my first introduction to your work on another...
Gatchaman
Member
Last Activity: 06-07-2018, 07:44 AM
Joined: 03-11-2014
Location: London
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Re: Project: Build an external Li-po battery for a Kodak Pogo printer.
Found some interesting bits on youtube...
Hacking a DSLR - Creating an External LiPo Battery Pack [url]https://www.youtube.com/watch?v=vS75dWxOXDg[/url]
[url]http://www.andrewhazelden.com/blog/2012/06/hacking-a-dslr-external-lipo-battery-pack-mod/[/url]
I think I've settled for a "Gliders G-POWER 35C 2s 7.4v 2250mah (LxWxD) 105x35x15mm Weight 128g Fitted Connector DEANS" which looks good dimension wise as a base for this project. And a "Digital 60V 100A Balance Voltage... -
Project: Build an external Li-po battery for a Kodak Pogo printer.
This is another one of my projects that's distracting me from completing the NAD-T760 job :-(.
Years ago I bought a Kodak Pogo Printer on Amazon. It went down from £80 to £20 and I couldn't resist it. The paper was quite dear at the time ~£9 for 30 sheets so I left the printer on a shelf gathering dust. The price of Zink paper has plummeted and I've decided to resurrect the printer. The only problem is the li-po battery is quite dead and the fully charged pogo battery that was supplied with the printer was only good for about 15 prints and that's it. In my opinion Kodak should never... -
Re: Noob attempting to fix a blown NAD T-760 AV receiver
Cheers and will do!Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Went back to the site where the transistor exploded and tested a few more things around the area. Looks like a load of resistors in the K ohm range have lost resistance and dropped down to silly levels. Going through the components near the transistor but this time I'll look at a larger area and build a proper parts list. CPC here I come..... again :-)
Used the new soldering iron today and I'm such a tit for not upgrading years ago. Wow is all I've got to say.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Okay cheers. :-). Still looks bloody crude for a in-house job though.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
I find the suspect thing to be the NJM5532s' extension, Agent. These mods look just to crude to be done by a official Nad tech. I could be wrong.
If I'm reading the service manual right then the person who soldered the U109 pin 5 ( non-inverting input ) extension on the NJM5532 IC, soldered it to the same boards U103 CS5331A IC pin 6( analogue ground). Does that mean anything to anyone?
[url]http://www.cirrus.com/en/products/cs5330a-31a.html[/url]
Going to cut it off anyway just to see...Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
I need to find somebody with with a T760 who can take some pictures for me so I can compare what's under my hood to theirs. Will post some pictures of some things that are confusing me.
Pic1 : From the main motherboard to the AC3/DTS board is this cable with the ground cut.
Pic 2 : Ground cut. Who knows why?!
Pic 3: NJM5532D* operational amplifier. Some strange reason one of the legs has that thing soldered to it which connects it to the pcb.
Pic 4: One the surround board is this wire that...Last edited by Gatchaman; 04-12-2014, 07:03 PM.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Your info came a couple of days too late mariushm..... :-I. Thanks anyway.
Would be too much of a hassle to send it back. I'm just glad I've got some better soldering gear and if it does break down or something at least I can return it to CPC instead of shipping it back to China or wherever. Maybe I'll donate it to somebody else in the future if and when I upgrade.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Quote from the manual "The Digital Input 1 is linked to the Video 1 input
(marked Digital In on back panel; No. 6). Digital Input
1 allows for connection of a digital source with an
Optical digital output. Whenever Video 1 is selected,
Digital Input 1 will also be selected; in the display the
“DIGITAL 1” indicator will start to blink. If a digital
audio signal is detected, the “ DIGITAL 1 ” indicator will
stop blinking and remain lit. If no digital audio...Last edited by Gatchaman; 04-11-2014, 06:26 PM.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Thanks for the advice. Will be taken on-board and stored away for good measure.
Yes I replaced the blown transistor. When I took the solder off transistor one of the legs fell off onto the work bench. Turns out that the leg had been properly blown right off the transistor!! :-O!
I'll look back through my pictures to see if I can spot cap c141. Hopefully I've got it in the background and should be able to tell if I messed it up or not.
I had a copy of the manual, but yes I left it at...Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Past the 90 minute mark so can't edit the update post again.
Disregard my previous post about the rectifier. In the noob zone.Last edited by Gatchaman; 04-08-2014, 08:35 AM.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Past the 90 minute mark so can't edit the update post.
Just wanted to add.
The more I look at the board the more I see "new" solder points.
Pulled the rectifier off the board and tested it with the meter on diode setting.
After connection the negative clip to the positve point on the rectifier and going round and getting zero I reversed the clips. With the positive clip connected to the positive point at the bottom and went clockwise and read (left )535 then (...Last edited by Gatchaman; 04-08-2014, 07:49 AM.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Update.
Okay after replacing a few of the caps and resistors I've managed to power the unit back up but it still switches over to "safe mode" after the display comes on for a few seconds. Just the fact that it hasn't turned into a blazing pile of components when I first switched it back on has made me happy.
Powering down after the first couple of tests I looked around a bit more and found that a caps jacket had melted. c141. The jacket hadn't come off fully but my suspicions had been raised....Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Thanks guys ! :-)Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Found and read this so I think, and hope, I can find a more modern replacement for the EOL transistors.
Title :CHOOSING A REPLACEMENT TRANSISTOR
And actually read the page google sent me to this time and clicked the link to find equivalent transistors for the 2SA1941 and co.
[url]http://alltransistors.com/crsearch.php?mat=Si&struct=PNP&pc=0&ucb=0&uce=140&ueb=0&ic=10&tj=0&ft=0&cc=0&hfe=0&caps=TO3P[/url]
Will have to...Last edited by Gatchaman; 03-17-2014, 12:37 PM.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Thanks Agent and Mariushm.
I'd sooner change all the 2SA1941's for newer transistors then some cheap knock-offs. In fact I'd change all the power transistors if I could!
Question. When you can't find exactly what you're looking for do you always get something that's as close to or above the spec of the original? With caps I take it you have to get the same uF but the voltage can be (a lot) higher or as close as possible to the original. With transistors I wouldn't know what to look out for. Think...Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
I ticked the from Ebay UK tick box so hopefully the parts are 60%- 40% kosher. But who's to say that the seller didn't get them from Chi.... sorry I meant Japan.
Sellers are : littlediode_components
mkpianosupplies and mayflo818.
I have no idea where they source there gear from but I tried CPC the most legit source for components I could think of and no joy. Google just can up with spec sheets really.
I guess things have moved on since the amp was made and components aren't getting...Last edited by Gatchaman; 03-16-2014, 07:07 AM.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Ordered caps and resistors from CPC but having trouble sourcing transistors like the 2sa1941 (blown) , 2sc1740s, 2sc5171, 2sa1930, 2sc1845 (all near by)...... Going to have to chance it on the bay it seems.
Anyone in the UK have a good source of transistors that they use. Haven't got my test gear yet so I might be jumping the gun a little.
Going with the bay for now. I hope these are the real deal.... Well I'll soon find out!Last edited by Gatchaman; 03-15-2014, 05:46 AM.Leave a comment:
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Re: Noob attempting to fix a blown NAD T-760 AV receiver
Cheers, man! :-)Leave a comment:
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