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Old 19th August 2015, 10:29 PM   #1
swedude is offline swedude  Sweden
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Question punch 60 ix pc-0764

hi im totally new on this grait forum.well to the problem.i just picked up a Rockford as described in title, from a box that been laying around for maby 15-20 years!! i just feel for try repair it again.but im not sure what outputfets it had course i left it half dissasembled last time.i got a schematic from net but it dosent are equal to the board.on my board its only a pair of outputfets but on chematic its 2 for eatch channel.do any have chematic for this one.the problem i can remember was the fets on output gone, and after new one installed them got hot very fast.it seems like i have done some Changes Before course on Power board its irfz44 and i see i have changed some resistors to 68r near the transformer.the Power side is ok, i can get it on to led.(no fets is on the board on output now.if i remember right i broke it by showing some people the filterpass card, and forget to turn off the system.(wery stupid i know)
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Old 20th August 2015, 03:43 AM   #2
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http://www.bcae1.com/temp/rockford%2...20pc-0764f.pdf
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Old 20th August 2015, 07:37 PM   #3
swedude is offline swedude  Sweden
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Thanks a lot Perry.it seems to bee the right one.if you have any ideas about the problem i,ll be glad. It so longt time ago i did this things so i start to feel like im learn how to run a bike again i Think it just to start up the meter and start to measure the transistors in line with the buz11, then.sorry for my Little bad English.
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Old 23rd August 2015, 09:58 PM   #4
swedude is offline swedude  Sweden
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HI AGAIN i have done some measuring,first some info.the amp have all the buz11 desoldered.and the dc-dc power works,so i can start the amp.I start to test left channel komponents. q112 is b=-12,27v c=-0,53v e=-13,91v ? and the q113 gives from -13,2 to -14,38 on all legs.from right to left legs it increase..measur the pads of buz 11 gives on q142 g=+1,665v d=+27,35 and s=+3,5mv on q143 i get g=-22,92 d=3,5mv(not sure if it was negative of not) and s=-27,27v and it almost the same result for right channel.alsp q114 give me headace i got around 13v om both base and emitter but less then 0,5 on collector. anyone have any ideas? by the way i got one homehifi amp worked today..
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Old 24th August 2015, 05:20 AM   #5
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You cannot use voltage to troubleshoot inside the feedback loop if the loop isn't complete (it's not complete without the output transistors in the circuit).

Q114 voltages should be near -13, not +13.
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Old 24th August 2015, 01:05 PM   #6
swedude is offline swedude  Sweden
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ok så maby i can put on new buz11 and Quick measure then? Before it gets to hot.oohh i belive it was netative on q114.well you seens to know a lot about this, maby you know common problems on this amps outside the putputs and the irfz44.a blown.first time a repaird it it has buz or 44 blown, i cant remember witch of it, time goes fast 15-20 years poff
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Old 24th August 2015, 02:25 PM   #7
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Do you still have the output transistors you removed from the amp? If so, re-check them. Which ones have failed?
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Old 24th August 2015, 09:45 PM   #8
swedude is offline swedude  Sweden
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no. i cant find them so i guess i trow them away.i have order 10 new but dont have them yet.but i have a lot of irfz44 at home,but gess i cant use them for output on this amp.really havent checked. will you rekoned test q112-113 by ohm or diode test?i have one appa 69mutimeter to test with.i have been gone for so long from this so i dropped a lot.but Think this is fun and stimulates the brain.
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Old 25th August 2015, 04:03 PM   #9
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I don't understand the question.
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Old 27th August 2015, 06:26 PM   #10
swedude is offline swedude  Sweden
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i meant ,what is best to measure the transistors on board when i got no Power to it.use ohm,s or diodetest,i often use diotest because the transistors have diods in them.
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