rccrasher65
Badcaps Veteran
Last Activity: Yesterday, 09:59 PM
Joined: 03-23-2014
Location: west mifflin
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some transistors are arriving today! I'm going to start with the 4 big output trans. first then Q11, Q10, ect. I'm going to place an order for some new resistors, as well as new caps.... -
Thanks, I thought that's what you were talking about. There will be no need to touch them at all....Leave a comment:
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Yea,I saw those, actually they test good, but are getting replaced anyway. Thanks. Some parts are coming on Wed, this week....Leave a comment:
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Can you highlight what resistors look bad, I plan on replacing, most of the components on that board anyway....Leave a comment:
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Can you circle what you are talking about, thanks...Leave a comment:
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I think I got it see if these help I can get better now that I know what I'm doing....
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I'm going to try and upload some pics. do you have to do one at a time or can you make a file and upload that with pics in it? Happy Easter, parts should be here this week some time. Thanks...Last edited by rccrasher65; 04-20-2025, 12:17 PM.Leave a comment:
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I have found the replacements I need, Ordered, and on the way. Is there anything I can do while we wait for parts? I want to thank you again for your help, and Have a very Happy Easter as well....Leave a comment:
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I have a fluke auto ranging DMM, thanks for your reply...Leave a comment:
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I'm going to find as many of the originals as I can, there are plenty of old stock out there, I'm replacing all of them on that board, including Q17, and 18, and caps too. I don't want to take a chance of more failure, I've done enough already. If at all possible, can we mark on the foil side, where those voltage test points are, I don't want to make any more stupid mistakes, not knowing where to place my positive probe on, I'm going to try and get a few pics on here, never was good at it even back then, when I was really active on here, thanks again,I'll post what I find,...Leave a comment:
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I sort of figured , I messed it up, I don't understand how testing Q11 caused the relay now to work, that's when I slipped and touched another pin on Q11, and shorted out the transistors on the heatsink. they were ok before I started, and now the have continuity between all 3 pins in every direction.I,m going to get new replacements for all the transistors,caps, and some resistors for spares, just in case, I use digikey, and mouser, Do you have any suggestions for good replacements. I'm going to list the original components on here, and If you have any suggestions for better replacements I would...Leave a comment:
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Well just my luck, as I was continuing to get voltages I decided to start with Q11, being a little shaky, (should have stopped) I slipped and must of hit both pins of Q11, and a little spark, and little burn smell. Now I discover that the relay now clicks in 3 seconds as it should. How about that for some crazy crap, but I now have 048,4V on right speaker terminals, 052,4 V on the left, Dim bulb still shows a short. I do believe I blew the 2 IC's right next to Q11, on heat sink. They show continuity on all three pins, The other 2 do not have continuity between the pins, I thought Q11 was...Leave a comment:
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I got a few voltage measurements for you. I have to find all the components on the foil side because of clearance, very tight in there, plus the fact I cant see worth crap any more.Power supply voltage is pin7 -29,75V pin 8 ground pin9 29,68V RL-1 52,3V and across coil 52,3V Q16 -29.94 Q17 +29,98V I also measured DC offset from speaker terminals and got right channel 193,0mv and left 0.0mv that's it for now.I will get more this evening. let me know if this tells anything about the problem....Leave a comment:
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Cap leaker, thanks, but have to slow down. I've been away from this for a long time, and never worked on an amp before.
I'm going to look for all these voltages you have pointed out, but if you can just tell me one step at a time, and where to find the specific voltage, till I get the swing of things again. Eyes aren't that great either. so I have to open the diagram to about 150% to see, I can't read what's in green marker. give me a few. for the readings.Thanks again for your help,, it's much appreciated. This amp has a lot of sentimental meaning for me, was given to me by...Leave a comment:
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Thanks gentlemen, I appreciate the quick response. CapLeaker thanks for the clear readable set of schematics, mine are too blurry to get readable voltages. If you have the time I would appreciate if you could mark on the schematics, these voltages you want me to check first.I have been using a dim bulb tester to power on the amp. It glows lightly for about 3seconds and off. not very bright at all, but no relay click. A very common fault from what I've been told on Kenwood amps Is it ok to power up without the DB tester to get voltages? I'm very rusty at the moment, and will need all the help I...Leave a comment:
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KENWOOD KA-701 POWERS ON, NO RELAY CLICK
I'm looking for some help, sorting out a protection circuit fault on my Kenwood KA-701 integrated amp. The amp does turn on , but the relay don't click. It usually ends up being, a transistor, or cap on the protection circuit, DC offset problem. I can't read schematics real well, and the ones I have are really bad quality. There are no good quality one's I have found so far. Looking for some professional help. Blue Midnight helped me a lot in the laptop forums, but It's been a few yrs, like 6 or so. I don't even know if he's on here or if anyone does the amps, but any help navigating throught... -
Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Thanks BlueMidnight. Will get back to it in oct....Leave a comment:
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Gents,going to have to pick this up in late fall, sept or oct. I just have to much going on right now. I think I have enough info to run a practice run on bad boards for now, but will get back to you in fall when I want to flash good board....Leave a comment:
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Going to need some time to get this all right, so I'll get back to you when I have a good feel for what I'm doing....Leave a comment:
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Re: Hp Probook 455 G3 DAX73AMB6E1 blinking charge light, not turning on
Thanks BM. I just might de solder chip. I've done 144pin chips with alot of success, this 8 pin is nothing. I'll practice with the clip on the junk boards,and when I do the good board I'll take the chip off....Leave a comment:
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