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chandan.ahluwalia
Apprentice
India
126 Posts |
 Posted - Nov 30 2007 : 04:25:52 AM
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I have an amplifier which stopped working and when i opened its plate to see the pcb, the four resistors on it were carbon black and they are blown up i think as the power LED of amplifier turns on but sound doesn't come out from the speakers..
The problems is the colour codes on it is not readable so how can i find their values? |
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OutToLunch
Apprentece
24 Posts |
Posted - Nov 30 2007 : 1:31:41 PM
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| obtain the same model amplifier - one that works, crack open the case, then look at the resistors. Next put the case back on and use that amplifier since it works. |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Nov 30 2007 : 4:15:19 PM
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| The resistors are blown up because transistors and other parts are also blown up. |
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cyclopsitis
Nobel Prize Winner
Canada
732 Posts |
Posted - Nov 30 2007 : 9:13:19 PM
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| yeah man, there are a lot of other parts that would be gone if a bunch of the resistors are gone. Some of the power transistors must be shorted. Goodluck! |
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chandan.ahluwalia
Apprentice
India
126 Posts |
Posted - Dec 01 2007 : 07:21:31 AM
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well, i got it checked from many places and from many guys and they say the transistors are fine..
And about the other same amp, i already thought about that but noone is having that.. |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Dec 01 2007 : 12:34:20 PM
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Maybe you shorted the output of the amp which caused a current that was high enough to burn the resistors but not high enough to blow the transistors. It is very unlikely.
Enter the make and model number of the amp into Google and you might find its service manual with its schematic, parts layout and parts list. |
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chandan.ahluwalia
Apprentice
India
126 Posts |
Posted - Dec 02 2007 : 07:33:08 AM
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no.. Unfortunately i didn't find out.. well i guess there is no other way to find it out..
Anyways, thanks for advise.. |
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nhoy_mags
New Member
Philippines
1 Posts |
Posted - Dec 18 2007 : 7:52:06 PM
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| replacinf new resistor won't fix your amplifier.check yout transistors |
Mag's Electronics and Cellphone Shop
Dila, Bay,Laguna
Cell #:09229414500/09273963143
E-mail:nhoy_mags@yahoo.com
Webmail:nhoy_mags@gsmsandwich.com.ph |
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mrgone
Nobel Prize Winner
USA
1176 Posts |
Posted - Dec 31 2007 : 5:21:39 PM
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| Look up Xsistors in Datasheet catalog site. It should have typical vaules & wattage rating. It doesn't matter if a few ohms off. No biggy. See if it works first. |
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Binary 1011001101
Nobel Prize Winner
United Kingdom
569 Posts |
Posted - Dec 31 2007 : 6:45:16 PM
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Yes, but if the value on the resistor is unreadable- it is too burnt, how are you meant to get the value? However I have burnt many resistors and sometimes (all the time for me) the outside is completely black and the resistance is as if it would be not burnt. That may be in your case.
But as mentioned before, a fault caused the resistor to burn up, the chances are is that if you replace it, it would just burn out again unless something had fallen in it and caused a short.
Try and find the service manual for the amplifier, the scheatic will be in there...
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mrgone
Nobel Prize Winner
USA
1176 Posts |
Posted - Dec 31 2007 : 9:29:25 PM
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| Escuchen...read the data sheet |
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Binary 1011001101
Nobel Prize Winner
United Kingdom
569 Posts |
Posted - Jan 01 2008 : 12:04:49 PM
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| Datasheet for the amplifier? |
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chandan.ahluwalia
Apprentice
India
126 Posts |
Posted - Jan 23 2008 : 09:08:05 AM
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| Well, i searched a lot but the proper data for that amp is available nowhere.. |
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jorick
Apprentece
9 Posts |
Posted - Jan 29 2008 : 07:00:17 AM
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well give me everything you know about the amplifier and i will search for you
if you only have the complet name of the amplifier it's oke but if you have more it would come in handy |
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chandan.ahluwalia
Apprentice
India
126 Posts |
Posted - Jan 29 2008 : 10:59:59 AM
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Well, the amp is 2 channel,alpine MRV-F502... Silver body, and thats all i know..
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jorick
Apprentece
9 Posts |
Posted - Jan 29 2008 : 12:02:48 PM
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oke i will search for you i hope i will find something for you that you can use i will react back in a day if i found something or not
btw i have already searched a little but i think i already know what the problem is: i have searched on the official alpine site and they don't have a product with that name (for as far as you can trust an internet site ) i will continue seaching so don't worry |
Edited by - jorick on Jan 29 2008 12:21:37 PM |
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Topic |
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Blown resistors
