Volume Control Chip
Greetings,
I stumbled across this forum while trying, unsuccessfully, to locate an IC for the DCP501. Does anyone know of a source for the electronic volume control chip? It is IC619 on the main board, near the edge closest to the audio amp board, about midway front to rear. It has a chip number of KIC9482F. I have tried every cross reference I can find, but no one seems to recognize it. The closest I found is a Toshiba TC9482F. The pinout seems to match, but I don't find any US distributors for that chip either.
I have confirmed with a scope that audio enters the chip, but never comes out. Pulses are entering the chip on the data pin corresponding to activity on the volume knob.
Can anyone help me????
Greetings,
I stumbled across this forum while trying, unsuccessfully, to locate an IC for the DCP501. Does anyone know of a source for the electronic volume control chip? It is IC619 on the main board, near the edge closest to the audio amp board, about midway front to rear. It has a chip number of KIC9482F. I have tried every cross reference I can find, but no one seems to recognize it. The closest I found is a Toshiba TC9482F. The pinout seems to match, but I don't find any US distributors for that chip either.
I have confirmed with a scope that audio enters the chip, but never comes out. Pulses are entering the chip on the data pin corresponding to activity on the volume knob.
Can anyone help me????
dcp501 disassembly
I have been reading with interest this discussion. I have had a DCP501 for a couple of years & It's been fine until last week. Sound only from the left front speaker. Speakers all check out. Tried to get at the power board. But need to get the input board out to get at it. To get at the screws for the input board, I need to remove the 2 piggyback boards. The connectors that hold them up look like they are glued. Can anyone tell me the right way to separate them?
Thanks for your help.
I have been reading with interest this discussion. I have had a DCP501 for a couple of years & It's been fine until last week. Sound only from the left front speaker. Speakers all check out. Tried to get at the power board. But need to get the input board out to get at it. To get at the screws for the input board, I need to remove the 2 piggyback boards. The connectors that hold them up look like they are glued. Can anyone tell me the right way to separate them?
Thanks for your help.
Chances are one of the TA3020 is blown, or at least the output FETs.
The DCP is a pain to disassemble, and at this point I don't recall how I did it.
You are probably better off just buying a new one or getting something different.
The DCP is a pain to disassemble, and at this point I don't recall how I did it.
You are probably better off just buying a new one or getting something different.
dcp501 disassembly
Your probably right but I have more time than money, so my best option is the attempt to fix it. Does anyone have the schematic or service notes? Thanks in advance for any help.
Your probably right but I have more time than money, so my best option is the attempt to fix it. Does anyone have the schematic or service notes? Thanks in advance for any help.
Hi Pano, On the DCP501 Do you still have that CD/DVD drive?
Please send me an e-mail at dtavis@hotmail.com
Hi John65b, On the DCP501 Do you still have that CD/DVD drive?
Please send me an e-mail at dtavis@hotmail.com
Thank You,
Hi Robert,
I have a perfect working (basically brand new) Moto dcp-501, plus remote I would be willing to sell you if you are interested.
I'll sell it for $130 plus $45 shipping. As you know it's big and heavy.
I have another Moto dcp-501 that was modified by theAnonymous1, it's a work of art! So that is why I can let my other spare stock one go.
Best!
Tripath07
I have a perfect working (basically brand new) Moto dcp-501, plus remote I would be willing to sell you if you are interested.
I'll sell it for $130 plus $45 shipping. As you know it's big and heavy.
I have another Moto dcp-501 that was modified by theAnonymous1, it's a work of art! So that is why I can let my other spare stock one go.
Best!
Tripath07
Hi Tripatho7,
Thanks for the reply. I would like to get the dcp-501 I will need to wait tell the end of Feb. How was the other one modified and why?
Hi Robert,
Sounds good, just let me know in Feb. and we will get it going.
The modified one was built by theAnonymous1 and he had mention at that time he would sell it, and I was able to buy it. Below is the description of the mods.
Btw, I still have your Moto DCP 501 as part of my Tripath collection that is now up to 6 or 7 different amps/Tripath based electronics. I have sold some, as I've bought more. Your Moto is a Work of Art! All of the mods you did to it are amazing, from the removeable power cord (which is nice as I have since found out different power cords will give out different sound with this and my CD/DVD players), to the 5 sets of Banana speaker posts (huge). The real Artwork is on the inside! With the: 5 - Jantzen Audio Cross Cap 3.3 uf 400 v MKP caps, and the 5 - Huge Torrodial core output coils! I just pulled the top off to look at them again it's been awhile.
Sounds good, just let me know in Feb. and we will get it going.
The modified one was built by theAnonymous1 and he had mention at that time he would sell it, and I was able to buy it. Below is the description of the mods.
Btw, I still have your Moto DCP 501 as part of my Tripath collection that is now up to 6 or 7 different amps/Tripath based electronics. I have sold some, as I've bought more. Your Moto is a Work of Art! All of the mods you did to it are amazing, from the removeable power cord (which is nice as I have since found out different power cords will give out different sound with this and my CD/DVD players), to the 5 sets of Banana speaker posts (huge). The real Artwork is on the inside! With the: 5 - Jantzen Audio Cross Cap 3.3 uf 400 v MKP caps, and the 5 - Huge Torrodial core output coils! I just pulled the top off to look at them again it's been awhile.
Hello Robert - for some reason I was not notified of your request - sorry.
I do have the drive if you are interested...let me know.
Sorry so late.
Hi,
I've got a perfect, Minty - Moto DCP-501 with remote that I would sell if someone wants to buy it.
$100 plus $40 shipping.
This is my spare and it's only been used for around 20 hours or so!
Cheers
I've got a perfect, Minty - Moto DCP-501 with remote that I would sell if someone wants to buy it.
$100 plus $40 shipping.
This is my spare and it's only been used for around 20 hours or so!
Cheers
Moto Drive IC
Can anyone tell me if these
"Motorola Drive I/C"
are used in this dcp 501 unit. If not, then any suggestions?
B.
Can anyone tell me if these
"Motorola Drive I/C"
are used in this dcp 501 unit. If not, then any suggestions?
B.
Member
Joined 2003
Digging up this old thread, but I bought a DCP501 back when this thread was popular and it collected dust in the closet until just recently. I'll take some photos and post them up here, but here's a description of what I did:
-gutted amp board and power supply from the unit, threw the rest away
-added more caps on the power supply in the provided spaces
-increased current limit as per the info somewhere in this thread
-replaced electrolytic coupling caps with film type
-installed in 2U rack chassis
-cut tracks on the board for the output connectors and ran wires directly from relays to the binding posts
-applied 5V to the required spots to make the sucker work
-routed all ground connections back to the star point on the power supply
What I am finding is two issues, just wondering if anyone has reboxed the DCP501 amp and had similar issues.
1. Two speakers make very loud pop when amp is shut off. I think relay must not be opening fast enough when power is removed. Haven't looked at it in much detail since I just got the thing wired up and working late last night.
2. If I ground the chassis, which I would like to do for safety, the amp makes a buzzing noise out all channels. Remove earth ground and problem is resolved. I notice that the amp board is grounded in several locations, I am considering trying to isolate the ground from chassis except in the star point on the power supply.
Anywho, stay tuned for some photos of this mess.
-gutted amp board and power supply from the unit, threw the rest away
-added more caps on the power supply in the provided spaces
-increased current limit as per the info somewhere in this thread
-replaced electrolytic coupling caps with film type
-installed in 2U rack chassis
-cut tracks on the board for the output connectors and ran wires directly from relays to the binding posts
-applied 5V to the required spots to make the sucker work
-routed all ground connections back to the star point on the power supply
What I am finding is two issues, just wondering if anyone has reboxed the DCP501 amp and had similar issues.
1. Two speakers make very loud pop when amp is shut off. I think relay must not be opening fast enough when power is removed. Haven't looked at it in much detail since I just got the thing wired up and working late last night.
2. If I ground the chassis, which I would like to do for safety, the amp makes a buzzing noise out all channels. Remove earth ground and problem is resolved. I notice that the amp board is grounded in several locations, I am considering trying to isolate the ground from chassis except in the star point on the power supply.
Anywho, stay tuned for some photos of this mess.
Member
Joined 2003
Going back a couple pages, I see I already posted about this in 2008. Never did get the amp to work right at that time, so it went in the closet...Also it was just kludged together back then, I redid most of it to be more aesthetically pleasing and functional.
Also, contrary to the info earlier in this thread, you don't need to wire the protect pin to 5V. It's a fault output, not an input.
Also, contrary to the info earlier in this thread, you don't need to wire the protect pin to 5V. It's a fault output, not an input.
Last edited:
BRAND NEW IN BOX FOR SALE
I have a brand new one - never used, in the original box with all accessories still sealed.
This is my "spare one" - I bought two for experimenting. Never got around to do it and gifted one to a friend. The second one never left the box.
I still need to figure out shipping, etc., but before posting on eBay, I decided to check possible interest among my fellow DIYers.
😉
I have a brand new one - never used, in the original box with all accessories still sealed.
This is my "spare one" - I bought two for experimenting. Never got around to do it and gifted one to a friend. The second one never left the box.
I still need to figure out shipping, etc., but before posting on eBay, I decided to check possible interest among my fellow DIYers.
😉
Hello
It is for sale here: MOTOROLA DCP501 5.1 RECEIVER - 100 WATT / CHANNEL - NEW IN ORIGINAL BOX 0612572007839 | eBay
Anyone ever encounter a squeal with this amp? I have been experiencing this, a shutdown, couple minutes rest, and restart fixes in the short term. Only happens every once in a while, and doesn't seem to be tied to anything obvious. The speaker load is an easy one and I'm rarely asking more than 1W from the amp, even on peaks.
I'm thinking about hacking it into a 5ch amp but don't want to bother if it's something on the board. I'd guess the squeal to be about 1kHz at .5V or thereabouts.
I'm thinking about hacking it into a 5ch amp but don't want to bother if it's something on the board. I'd guess the squeal to be about 1kHz at .5V or thereabouts.