Service manuals, schematics, eproms for electrical technicians
USSR MUROMEC.
Type: 
(DJVU)
(DJVU)Size
128.1 KB
128.1 KB
Page
3
3
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
If you get stuck in repairing a defective appliance download this repair information for help. See below.
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar ussr manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar ussr manual?
Document preview [1st page]
No preview item for this file.
Possible causes:
- No preview picture generated yet.
- It is not a pdf file.
Advertisements
Please tick the box below to get download link:
- Also known:
USSR MUROMEC.
- If you have any question about repairing write your question to the Message board. For this no need registration.
- If the site has helped you and you also want to help others, please Upload a manual, circuit diagram or eeprom that is not yet available on the site.
Have a nice Day! - See related repair forum topics below. May be help you to repair.
Warning!
If you are not familiar with electronics, do not attempt to repair!
You could suffer a fatal electrical shock! Instead, contact your nearest service center!
Note! To open downloaded files you need acrobat reader or similar pdf reader program. In addition,
some files are archived,If you are not familiar with electronics, do not attempt to repair!
You could suffer a fatal electrical shock! Instead, contact your nearest service center!
so you need WinZip or WinRar to open that files. Also some files are djvu so you need djvu viewer to open them.
These free programs can be found on this page: needed progs
If you use opera you have to disable opera turbo function to download file!
If you cannot download this file, try it with CHROME or FIREFOX browser.
Translate this page:
Relevant AUDIO forum topics:
A címben szereplő Yamaha AX 500-as erősítő rajzán nem láthatóak a feszültségadatok.Ha valaki ki tudná egészteni a végfok és a védelem tranzisztorok lábain mérendő feszültségek értékét,az nagy segítség lenne a javításnál.Ugyanis a tápfeszek,és az összes alkatrész jónak tűnik,de az erősítő mégsem indul el.
A válaszokat előre köszönöm!
A válaszokat előre köszönöm!
This one had been sitting in a barn for years. Powered it up and the large power transistors on the heat sink would get hot
after a time....and the heat sink would also get quite hot. Speakers sounded like they had some DC on them....with a loud thump
Found the manual on Hi-Fi engine,
[ http://www.mediafire.com/file/b8mlsu7q3pz0bvf/hfe_nad_3140_service.pdf/file ]
and saw a video on youtube saying lots of capacitors dry out
due to their locations near resistors that get very hot, I guess sorta a poor
design. Went in and recapped almost the entire
product save for the (4) large 50V PS caps which appear to check ok.None of
the high power or driver transistors
mounted to the main heat sink were shorted..
Powered on but no audio, and noticed the fuses to Bridge D805 were melted open.
I believe they were ok before.
Replaced them and they started to light up like fiilaments, so shut down,
removed the bridge D805, then checked it, its ok.
There is about a 16 ohm short on the + / - lands where the bridge was. It
seems like something I did maybe is causing this,
like a capacitor in backwards, which I am doing alot of lately for some
reason.
Turns out, yep I put C805 (470/ 63) In backwards ! Capacitor still checks
ok, so will re-use it.
Short is still there though Im guessing R803 is adding in 5.6 ohms or so,
that means theres a 10 ohm short someplace. Q801, 802 arent reading short,
and looks like this becomes a +43V ps feed.
Any ideas out there on what to check next? I am guessing this cap in
backwards caused the voltage applied to a component to be
reverse and its shorted. Or would this be normal with a reversed cap installed,
and putting it in right would be how to fix it?
Steve Hearns
Technotronic Dimensions [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM
after a time....and the heat sink would also get quite hot. Speakers sounded like they had some DC on them....with a loud thump
Found the manual on Hi-Fi engine,
[ http://www.mediafire.com/file/b8mlsu7q3pz0bvf/hfe_nad_3140_service.pdf/file ]
and saw a video on youtube saying lots of capacitors dry out
due to their locations near resistors that get very hot, I guess sorta a poor
design. Went in and recapped almost the entire
product save for the (4) large 50V PS caps which appear to check ok.None of
the high power or driver transistors
mounted to the main heat sink were shorted..
Powered on but no audio, and noticed the fuses to Bridge D805 were melted open.
I believe they were ok before.
Replaced them and they started to light up like fiilaments, so shut down,
removed the bridge D805, then checked it, its ok.
There is about a 16 ohm short on the + / - lands where the bridge was. It
seems like something I did maybe is causing this,
like a capacitor in backwards, which I am doing alot of lately for some
reason.
Turns out, yep I put C805 (470/ 63) In backwards ! Capacitor still checks
ok, so will re-use it.
Short is still there though Im guessing R803 is adding in 5.6 ohms or so,
that means theres a 10 ohm short someplace. Q801, 802 arent reading short,
and looks like this becomes a +43V ps feed.
Any ideas out there on what to check next? I am guessing this cap in
backwards caused the voltage applied to a component to be
reverse and its shorted. Or would this be normal with a reversed cap installed,
and putting it in right would be how to fix it?
Steve Hearns
Technotronic Dimensions [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM
Sziasztok!
Még jó pár évvel, sőt évtizeddel ezelőtt hozzájutottam egy CD játszóba utólag beépíthető kis zajú kvarcoszcillátorhoz. Sajnos a tervezője (Viletel István) azóta elhunyt.
Az oszcillátor mind ezidáig kiválóan működött, de tegnap megszűnt rezegni. Szeretném megjavítani. Sajnos az alkatrészek nagy részéről le van csiszolva a felirat.
Amit ki tudtam deríteni: van benne egy SMD tranzisztor +P2 felirattal. van egy 14 lábú SMD integrált áramkör, ami a 7-es lábon földet, a 14-en tápot kap. A kimenetei: 1, 10, 13. Van egy 4 lábú fémtokos tranzisztor, amiből 5448A felirat olvasható, de lehet valami .443A is. Van két TL431.
A panel felirata: AnaMaster XQ Clock 3.0 by Hemtron.
A kvarcra rámértem, nem rezeg. A panel 12V-ot kap kívülről.
Kinek van ötlete, merre induljak el?
Előre is köszönöm,
- lcsaszar
Még jó pár évvel, sőt évtizeddel ezelőtt hozzájutottam egy CD játszóba utólag beépíthető kis zajú kvarcoszcillátorhoz. Sajnos a tervezője (Viletel István) azóta elhunyt.
Az oszcillátor mind ezidáig kiválóan működött, de tegnap megszűnt rezegni. Szeretném megjavítani. Sajnos az alkatrészek nagy részéről le van csiszolva a felirat.
Amit ki tudtam deríteni: van benne egy SMD tranzisztor +P2 felirattal. van egy 14 lábú SMD integrált áramkör, ami a 7-es lábon földet, a 14-en tápot kap. A kimenetei: 1, 10, 13. Van egy 4 lábú fémtokos tranzisztor, amiből 5448A felirat olvasható, de lehet valami .443A is. Van két TL431.
A panel felirata: AnaMaster XQ Clock 3.0 by Hemtron.
A kvarcra rámértem, nem rezeg. A panel 12V-ot kap kívülről.
Kinek van ötlete, merre induljak el?
Előre is köszönöm,
- lcsaszar
szép napot .kérdésem az stk 402-070s helyett stk 402 -070 s nélküli ic előre is köszönöm
Similar manuals:
If you want to join us and get repairing help please sign in or sign up by completing a simple electrical test
or write your question to the Message board without registration.
You can write in English language into the forum (not only in Hungarian)!
or write your question to the Message board without registration.
You can write in English language into the forum (not only in Hungarian)!
E-Waste Reduce