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Old 15th November 2002, 07:57 AM   #1
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Default blew up pioneer receiver

I hope i'm at the right forym

My question:

I have a Pioneer SX-305RDS. One of my friends little kids has blew him up :-(

(the kid is 10year and I think it has misconnected the wires from the speakers so the the amplifier had a short circuit)

I think i need to replace the transistors, am I right?
So yes, do I need to do something else? (i was told something about a standby-power??, i don't know the english word)

since i now own it (he has given it to me) i want to repair it myself (as a newby:-))
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Old 15th November 2002, 08:03 AM   #2
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if you connect a speaker to AL, AR, BL or BR you can't almost hear anythin (you have to set the amlifier 'full-open' before you can hear anything
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Old 15th November 2002, 08:07 AM   #3
halojoy is offline halojoy  Sweden
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seem very strange that the transistors is blow
a pioneer should have safety and fuses, so it not blow transistors
I know some of them uses IRFxxx IRF9xxx hex mosfet(IRF540/9540) for output
begin checking/changing fuses

if transistors are bad
see if anything around looks burned, black after a fire
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Old 15th November 2002, 08:23 AM   #4
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Default Re: blew up pioneer receiver

Quote:
Originally posted by Syprer
(i was told something about a standby-power??, i don't know the english word)
You have to check the transistors and replace the broken with similar onces. I don't know what you mean with 'standby-power'??? Do you mean the bias / quiescent current; in that case you don't have to adjust it if you use the same transistors.

HB.
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Old 15th November 2002, 08:40 AM   #5
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I can only find a fuse at the 230V entry, before the on/off button and the transfo.

For hugo: i mean "de ruststroom" like they say it in Dutch

It are TOSHIBA A1941 transistors
<url:http://www.semicon.toshiba.co.jp/en/...1/td_15/TD.pdf>

between B and E: oneindig
B and C: oneindig
C and E: oneindig
C and B: 8Mohm
E and B: 8.5Mohm
E and C: oneindig
(oneindig = many many many megaohms, don't know the english word, kan onybody help me? symbol= oo)

is it broken?
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Old 15th November 2002, 08:51 AM   #6
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Syprer,

'ruststroom' = quiescent current (dutch: normaal gezien moet er niets aan deze instelling gewijzigd worden als gelijkaardige transistors worden gebruikt bij vervanging)

Do you have a diode test on your multimeter?? A transistor is build up of two diodes one between the base and the emitter, and one between the base and the collector. Diodes conduct just in one way, remember that with measuring ohms!!

'oneindig' = infinite.

check this thread on how to test transistors:
amp problem

best regards,

HB.
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Old 15th November 2002, 09:42 AM   #7
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I have checked them all 4

2x A1941 PNP
2x C5198 NPN

the diodetester says that they are all ok.

what's next?


thx
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Old 15th November 2002, 10:53 AM   #8
JBL is offline JBL  Canada
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Those commercial receiver d'ont have a very good protection circuit. My sony receiver once had the protection circuit lock on even if the short was remove. You should check more than the output transistor.
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Old 15th November 2002, 12:51 PM   #9
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what do you mean with 'more'
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Old 15th November 2002, 01:49 PM   #10
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Default Eeeediot Proof ? - Not.

"seem very strange that the transistors is blow
a pioneer should have safety and fuses, so it not blow transistors"

Yeah right, sure thing.
If idiots did not blow up modern fragile amplifiers I wouldn't have a job to go to.
If you don't know, don't say ok.


Syprer, look for open circuit fusible resistors.
These may look ok but be O/C - you need to check with your DMM.
Put a 40W or 60W lamp across the mains fuseholder when first re-powering or use a variac after any repairs.

Eric.


"Better to keep your mouth shut than tell the world that you are a fool" - ?.
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