Which Part of the amp is giving you trouble? Which diode and resistors ? A pic would tell me loads, if you can get one loaded...
Plus we have a X engineer from SoundStream that posts here regularly, perhaps he can be of help also...🙂
Plus we have a X engineer from SoundStream that posts here regularly, perhaps he can be of help also...🙂
lexneedssound said:
What do they connect to? I ask because those numbers don't match any info I have on this amp. I need a general location to ID the parts..Tx 🙂
They are probably the gate drive resistors for the power supply FETs. If that's the case, they are probably 34 ohm resistors.
at a count of 6 each I would tend to agree 100%. And if those are fried then so are the driver transistors usually, also the mosfets. Good call Perry🙂
lexneedssound said:
Those are Diodes. i'm not sure of the part number but i just thought i'd mention it
FEP16BTD would be a good sub.
These are the originals (ebay):
170174790056
Have you checked them? If the amp won't power up, the problem is likely elsewhere. When these fail, the amp draws excessive current.
Post the DC voltage on the pins of the SG352x (3524 or 3525?).
IC#
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
These are the originals (ebay):
170174790056
Have you checked them? If the amp won't power up, the problem is likely elsewhere. When these fail, the amp draws excessive current.
Post the DC voltage on the pins of the SG352x (3524 or 3525?).
IC#
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
so this is what happen. used high current blew the fusses. put new ones in amp smoked took to repair shop they messed with it took some componets out now dont know what should be were? a schematic would help alot. but trying to fix it hard way.
Perry gave you the e-mail addy for SoundStream in the first part of the post, they will e-mail it to you most likely. I don't have it in my files, but most probably would not need it since I have worked on a few dozen of those over the years.
Sorry to hear your local shop was not up to snuff, for you.
JandR electronics on ebay repairs these also along with selling all the parts you might need. Jaime is great people, you can't go wrong with him....🙂
Sorry to hear your local shop was not up to snuff, for you.
JandR electronics on ebay repairs these also along with selling all the parts you might need. Jaime is great people, you can't go wrong with him....🙂
Old post but better than starting new. I've got a ref604 that I am scratching my head on. I have one that self destructed. 1 Driver board, a couple of outputs, power supply fets and diodes. I also replaced one 2SA1562 that was blown and the 2n2222.
So I have replaced all the bad stuff yet the amp still draws excessive current. With 12V connected but remote not powered I've got voltage on the neg supply rail ~-7-12V measured at one of the filtering coils.
Here are my measurements once turned on. I had the current limiter turned on so I didn't cook anything.
SG3524
1=1.325
2=2.250
3=0.241
4=.032
5=.032
6=2.870
7=2.065
8=0.061
9=3.69
10=0.035
11=2.052
12=6.68
13=6.68
14=2.113
15=2.058
16=4.47
Pin 1 doesn't seem right but I'm not finding anything. Open to ideas.
Measure the resistance from leg 3 of one of the 2SA1562s to the gate legs of each of the power supply FETs, you should read ~34 ohms for half of the power supply FETs.
Do the same for the other 1562 also.
If you find a gate leg that doesn't read ~34 ohms to one of the 1562s, it either has an open trace or a defective gate resistor.
Do the same for the other 1562 also.
If you find a gate leg that doesn't read ~34 ohms to one of the 1562s, it either has an open trace or a defective gate resistor.
Power supply appears to be ok. With current limiting set to 5A my supply voltage drops to ~7 but I have +/-20V at the rails on a scope. I've double checked the output transistors and they look good. Current sharing resistors measure good too. ??? Everything points to a bad output but I can't seem to locate it they are all testing good with a DMM. 🙁
Last edited:
Ok, pulled the inductors powered up still pulling too much current. V+=~+20V, V-=~-20 power supply side, amp section -10V on both rails.
If you twist/push/pull on the transformer, does the current draw vary?
What's the DC voltage on the gate legs of the FETs?
What's the DC voltage on the center leg of the FETs?
What's the DC voltage on the gate legs of the FETs?
What's the DC voltage on the center leg of the FETs?
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