help with resistor

moss99 · 25th June 2010, 07:37 PM

Hi all i am having trouble id ing this resistor i think the colours are white,orage,pink,red res (1632 x 920).jpg
thanks

multisync · 08:07 PM

it could be red red orange silver

22k 10%

can you find a similar one in the circuit and measure it.

red = 2
org = 3 or x 1000

silver = 10%

so 22000

moss99 · 25th June 2010, 08:18 PM

hi thanks for the reply i found another and that is blown too i think i have found a schematic but not too sure how to use it the resistor location says c531 and the other one also reading open says c710
TECHNICS SU X501 SCH Service Manual free download, schematics, eeprom, repair info for electronics

mjf · 25th June 2010, 08:20 PM

hello.
have you tried to measure it with a multimeter?
was the res "overheated"?
could be red violet orange............27k ?
greets

moss99 · 25th June 2010, 08:34 PM

Quote:

Originally Posted by mjf

hello.
have you tried to measure it with a multimeter?
was the res "overheated"?
could be red violet orange............27k ?
greets

yes multimeter is reading open circuit

Enzo · 26th June 2010, 04:28 AM

If they are called C531 and C710, then they are likely small ceramic capacitors instead of resistors. Try measuring them as caps. Red-red-orange would be 22000pf, or 0.022uf. They will measure open on a resistance reading. COnsidering what they are, I wouldn't be surprised if they were really OK.

Your schematic shows both those call numbers as 0.022uf caps. In this case both are coupling two different sections of grounds within the amp.

moss99 · 26th June 2010, 05:33 AM

Ah right capacitor ! (confusing this electronics ) well im learning,, would you mind having a look at the photo of the amp i have no sound output ,, i have tested the transistors marked with red arrows , also i have a audio signal generator but not too sure where to inject the signal to ,,would appreciate any help
mark..Amp t (1632 x 920).jpg

Enzo · 26th June 2010, 06:16 PM

Before applying audio signals, check that power supply voltages are all present.

moss99 · 27th June 2010, 07:10 AM

hi looking at schematic on the main chip on heatsink all voltages seem right except for pin 8 which should be -.1 i have -42 and pin 9 should be -42 i have -4.2

moss99 · 1st July 2010, 06:24 AM

Above post should have said voltages on pin s on the main SVI 3204 amp chip i have removed it and have a short between pins 2 and 11 i have traced the tracks back from these pins and checked the resistors which seem ok is there anywhere else i should pay particular attention to?
I have got a new chip ordered off "taobao" !! (chinese ebay) there you seem to be able to find anything you cant anywhere else ,,

here is photo of chip the short seems to lead back to this component not sure what it is though .chip (1632 x 920).jpg

25th June 2010, 07:37 PM	#1
moss99 diyAudio Member Join Date: Feb 2009	help with resistor Hi all i am having trouble id ing this resistor i think the colours are white,orage,pink,red res (1632 x 920).jpg thanks

25th June 2010, 08:04 PM	#2
multisync diyAudio Member Join Date: Jan 2008 Location: Carp	it could be red red orange silver 22k 10% can you find a similar one in the circuit and measure it. red = 2 org = 3 or x 1000 silver = 10% so 22000 Last edited by multisync; 25th June 2010 at 08:07 PM. Reason: boo boo

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25th June 2010, 08:18 PM	#3
moss99 diyAudio Member Join Date: Feb 2009	hi thanks for the reply i found another and that is blown too i think i have found a schematic but not too sure how to use it the resistor location says c531 and the other one also reading open says c710 TECHNICS SU X501 SCH Service Manual free download, schematics, eeprom, repair info for electronics

25th June 2010, 08:20 PM	#4
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. have you tried to measure it with a multimeter? was the res "overheated"? could be red violet orange............27k ? greets

26th June 2010, 04:28 AM	#6
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	If they are called C531 and C710, then they are likely small ceramic capacitors instead of resistors. Try measuring them as caps. Red-red-orange would be 22000pf, or 0.022uf. They will measure open on a resistance reading. COnsidering what they are, I wouldn't be surprised if they were really OK. Your schematic shows both those call numbers as 0.022uf caps. In this case both are coupling two different sections of grounds within the amp.

26th June 2010, 05:33 AM	#7
moss99 diyAudio Member Join Date: Feb 2009	Ah right capacitor ! (confusing this electronics ) well im learning,, would you mind having a look at the photo of the amp i have no sound output ,, i have tested the transistors marked with red arrows , also i have a audio signal generator but not too sure where to inject the signal to ,,would appreciate any help mark..Amp t (1632 x 920).jpg

26th June 2010, 06:16 PM	#8
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Before applying audio signals, check that power supply voltages are all present.

27th June 2010, 07:10 AM	#9
moss99 diyAudio Member Join Date: Feb 2009	hi looking at schematic on the main chip on heatsink all voltages seem right except for pin 8 which should be -.1 i have -42 and pin 9 should be -42 i have -4.2

1st July 2010, 06:24 AM	#10
moss99 diyAudio Member Join Date: Feb 2009	Above post should have said voltages on pin s on the main SVI 3204 amp chip i have removed it and have a short between pins 2 and 11 i have traced the tracks back from these pins and checked the resistors which seem ok is there anywhere else i should pay particular attention to? I have got a new chip ordered off "taobao" !! (chinese ebay) there you seem to be able to find anything you cant anywhere else ,, here is photo of chip the short seems to lead back to this component not sure what it is though .chip (1632 x 920).jpg

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