Whom is that? Evidently the part number in the schematic was never a part. I like mysteries but this one I'm going tiresome of. I really want to fix this amp so I can I say I did but wow.
I've no DC offset now but no audio. I messed with it an hour or so tonight. No Idea. Totally lost
Sometimes a batch of custom parts are made and the manufacturer (IR) has to give it a part number. If it goes into production, they will invest in producing full documentation. If it's only used by the company that ordered the special IC, there may not be any IR docs.
anaview.com. It's printed on the IC. This is from a smaller version.
anaview.com. It's printed on the IC. This is from a smaller version.
Attachments
Ok I understand. We will see what happens with UTSOURCE ICs when they arrive. I hope I learn something
Just some additional information: the IRS20956S seems to be a custom version.
It is quite similar to the IRS20957S, but there is one MAJOR difference between them: the 957S expects an external PWM generator connected to pin 3, while the 956S seems to have an internal PWM generator (accepting an analog audio signal with a max. amplitude of 1V). That makes the 957S unsuitable as replacement!
It is quite similar to the IRS20957S, but there is one MAJOR difference between them: the 957S expects an external PWM generator connected to pin 3, while the 956S seems to have an internal PWM generator (accepting an analog audio signal with a max. amplitude of 1V). That makes the 957S unsuitable as replacement!
Yes I got the IRS20956S from China UTSOURCE. They confirmed and working in one amp. I bought 10. One fixed one amp. Had two order amps. Installed in it and the Q3003 and Q3005 bad. IMTA2 and IMTX I think that's the parts they were. I forget. The 3rd amp still has problems. Got tired messing with it and set it aside. I got 6 more with similar problems. I've yet to open. I moved on to fixing some pinball machine boards I've been meaning getting around to. I will return soon. Following the other post on here with a gentlemen and the same poorly designed amplifier. 🙂
That's what it said and that's what I bought. I asked and they told me it's the only size they have. Ordered it. It was the right size. Worked in the amplifier about a few hours. Bad again. I don't know it was that IC or it not being correct. Anyway got tired of messing with it. Bad design amp with a custom IC. Amp is junk in my opinion. Doubt I'll work on it again. Probably just throw the ones I have apart in the trash and sell or give away the others.
I need help identifying this part. It is some sort of output driver I believe. I have two of these amps with this IC that is bad and I cannot find info on this part. IC3601
Datasheet link for replacement for anyone who needs reference.
https://www.mouser.com/ds/2/196/irs20965spbf-1228095.pdf
I can confirm that the IRS20956s from UTSOURCE is a suitable replacement. I have fixed 9 of these with bad 3601 driver ic's with direct replacements from UTSOURCE. Usually around $2.50 a piece.
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Hi guys - struggling with an Alpine PDX M6 failure which is stuck outputting a clipped 43VDC. Destroyed my 13TW5V2 (cone melted, and coil broke). I thought was my fault until I had it reconed by JL, reconnected it, and found it was pushing all the way out (everything is hidden behind seats). Wish I would have found it earlier - could have repaired the amp while the sub was in FL. Sub should still be fine...
I've googled this issue with the custom PWM driver defect, which brought me here as well as a German web forum which referenced this site. I bought the manual for the M6 as well.
Cross referencing the part number for the IRS20965S is super annoying, but I determined that you can buy it in the US from Digikey - part number is: IRS20965STRPBFCT-ND . Its just the Tape/Reel part number, which digikey cuts for us. You don't need to purchase it from UTSource. I'm purchasing it and will confirm.
For sake of easy searching in the future, can someone please confirm that IRS20965S = 98-1036TRPbF ? Thanks for the info!
I've googled this issue with the custom PWM driver defect, which brought me here as well as a German web forum which referenced this site. I bought the manual for the M6 as well.
Cross referencing the part number for the IRS20965S is super annoying, but I determined that you can buy it in the US from Digikey - part number is: IRS20965STRPBFCT-ND . Its just the Tape/Reel part number, which digikey cuts for us. You don't need to purchase it from UTSource. I'm purchasing it and will confirm.
For sake of easy searching in the future, can someone please confirm that IRS20965S = 98-1036TRPbF ? Thanks for the info!
Same problem in a german forum:
PDX M6 defekt -> 42V Gleichspannung am Ausgang
After some research the OP found out, that the subsonic switch is the culprit.
If this switch is stuck somewhere "in the middle between contacts" this problem will occur.
Maybe it is the same with yours?
PDX M6 defekt -> 42V Gleichspannung am Ausgang
After some research the OP found out, that the subsonic switch is the culprit.
If this switch is stuck somewhere "in the middle between contacts" this problem will occur.
Maybe it is the same with yours?
Thats the post. My subsonic switch was on 15 Hz for 2 years. I suppose it could have moved due to all the bass (amp is mounted vertical on backwall board, not on the sub box itself, but its next to the box). The switch is a little loose on mine, but it seemed like it was good enough to not move with some vibe. We are getting a snowstorm today, so I can't easily test it out right now. Maybe I will though... brb.
Just checked again - so without any RCA signal input connected, just by connecting power and remote trigger, the speaker output is a solid 42.5VDC output as soon as the amp turns on. Adjusting the subsonic switch, output level pot, crossover pot, and input sensitivity switch does absolutely nothing to affect the level of the 42.5VDC. This is a Fluke O-Scope measurement, not a basic multimeter.
I believe the person from Klangfuzzis had said their problem came back later on...although I could be wrong (I only used GoogleTranslate to read it--its more like cryptic notes than the story from that view).
If I have time at work, I will setup the amp on a bench to read the PWM driver pinout voltages. Otherwise I'm going to jump into just replacing both PWM driver ICs, testing, the replacing all 8 power supply and output FETs if the issue persists.
For test purposes, should I expect this amp to be pulling an excessive current if I set it up on the bench for test? If there is no load and no signal to amplify, the amp should technically be in idle right now, and safe for a bench power supply...
I have the same problem but intermittent with this amplifier PDX M6, never found a solution for it. Sometimes it's working ok for hours with load, next day it's faulty again....
Maybe start a new thread?
Maybe start a new thread?
I am also trying to fix one of these PDX-M6 amps and am really curious if it was ever confirmed if the IRS20965S (Digikey - part number is: IRS20965STRPBFCT-ND) was confirmed to work as a driver in these amps.
That is not the correct part and will not work.
The correct part is IRS20956. They are available from utsource.
IRS20956S International Rectifier,SOP-16,08+PB | IC Chips | UTSOURCE
I have repaired many Alpine amps with parts from utsource and have had no problems.
The correct part is IRS20956. They are available from utsource.
IRS20956S International Rectifier,SOP-16,08+PB | IC Chips | UTSOURCE
I have repaired many Alpine amps with parts from utsource and have had no problems.
You may try looking up Kev31779 on YouTube. I have seen him repair quite a few different alpine amps on his channel and he has schematics for them. Maybe ask him where he gets his.
Just my two cents,
David
Just my two cents,
David
Thank you all for your input!
I do not suppose there is a datasheet for the IRS20956 available? I looked everywhere I know of, but was unable to find it and would really like to know more about this device and understand how it is used.
Barber, thank you for the YouTube reference!
I do not suppose there is a datasheet for the IRS20956 available? I looked everywhere I know of, but was unable to find it and would really like to know more about this device and understand how it is used.
Barber, thank you for the YouTube reference!
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