DMRECONE 15 Posted February 4 Posted February 4 Hello, My name is Dan and i have a speaker and electronics repair business. Right now I have a Sunfire SDS12 in for repair. I need a PDF copy on the schematics for this unit. I have already repaired the power supply board but the unit also has a fault in the preamp/amplifier board. I could really use a set of schematics to help trace down the fault. Any help is greatly appreciated. 3
Half Life 1,087 Posted February 4 Posted February 4 Welcome to The Carver Site! Enjoy your stay! As you may already know, the Sunfire schematics will be somewhat difficult to come by on the Interwebs. However, I'm sure there may be someone on here that has worked on these before and can assist.
Sk1Bum 12,713 Posted February 5 Posted February 5 Hi Dan and welcome to thecarversite.com. Glad you found us! As @Half Lifestated, Sunfire manuals are challenging to come by. We don't have the one you're looking for in our library. The owner's manual is out there, but I couldn't find a service manual or schematic. Sorry I couldn't be more help, and I wish you good luck.
BobTFM35 3,039 Posted February 5 Posted February 5 Maybe use these pages as a starting point for your quest for information. https://sunfire.com/products/subwoofers https://www.niceforyou.com/na/solutions/audio-solutions 1
DMRECONE 15 Posted February 5 Author Posted February 5 I already tried both sites. Sunfire site is useless and only refers to the Nice site. I emailed nice and they referred me to EBC Electronics and they replied they have no schematics. Seems the only option now is to go without or try to find some in the wild. I will try a couple of things I suspect and if I have no luck I will need to refer the customer to somewhere else. Thanks for the reply. 2
Community Admin AndrewJohn 10,806 Posted February 5 Community Admin Posted February 5 Welcome. Another place I would look for help..., is YouTube. There are a dozen or more videos on "Sunfire Subwoofer Repair"..., one guy has made several, and is a member here (albeit has not stopped in in a long time). That guy is "Supreme Innovation" (his name on YouTube. The videos might help, but also, sending a creator of one of those might get a response - schematics unlikely, but experience, perhaps. Best of luck as you search. 1
DMRECONE 15 Posted February 5 Author Posted February 5 (edited) Spoiler AndrewJohn - I whent through YouTube and could not find anything on SDS12 repairs. I checked on "Supreme Innovation" channel and nothing there either on the SDS12. The SDS12 isn't like the other Sunfire subs, it uses a class D IC for output. I have already repaired the power supply but there is also an issue in the input / amplifier board. I'm pretty sure the class D IC is bad but it is controlled by an STA309A Multi-channel digital audio processor with DDX. There is one IC that I can't identify - TSSOP-20 package marked C1B4 and under that H1D3. I have searched extensively and can't find any datasheet or information on the chip. Can't tell if tit's a controller or an eprom , it is connected to a 4 pin header that I would think is for loading firmware. Having a schematic would eliminate the guesswork. Edited February 5 by DMRECONE 1
DMRECONE 15 Posted February 6 Author Posted February 6 I wanted to add a picture of the IC I need to identify but I don't have the points yet to add a picture or a link to it. 2
Sk1Bum 12,713 Posted February 6 Posted February 6 19 minutes ago, DMRECONE said: I wanted to add a picture of the IC I need to identify but I don't have the points yet to add a picture or a link to it. You do now.
DMRECONE 15 Posted February 6 Author Posted February 6 Thank you Sk1Bum - Here's the IC I can't find anywhere. 2
Half Life 1,087 Posted February 6 Posted February 6 Take all this with a grain of salt as I've never worked on anything by Sunfire (yet). Lots of speculation here from looking at the pic you posted. First, note there isn't a readily identifiable logo (I don't believe the M02 inside the circle is an actual logo). I compared it to known IC chip logos, including the JEDEC database of manufacturers - no match. The other markings could be just "house codes" like factory, date, batch, etc. I do not believe that Sunfire actually made any of their own IC's and this is likely a custom for Sunfire. It could be a PIC (controlling auto on/off, muting, etc.). However a PIC in this instance would be overkill. It could be a simple ASIC, controlling those same functions (more likely); ASIC's would be a lower cost at volume part for something like this. To narrow this down a bit, you'd have to do some circuit level sleuthing. You'd need to map out the pins and surrounding circuitry, taking note of signals/voltages on the pins of the device. From there you should be able to make an educated guess as to what it "might" be. Again, all of this is pure speculation. I have absolutely no experience or knowledge of Sunfire circuits. However, I do have experience in reverse engineering circuits containing unknown/obsolete parts. What I described above is how I would tackle this if I were working on it. Good luck!
DMRECONE 15 Posted February 6 Author Posted February 6 Thanks for the reply. That is what I generally do for an unknown part if I can't find a datasheet or any info. Thought I would at least ask and maybe someone here might know. I suspect it might be an eprom since it is connected to a 4 pin header and those are usually for loading firmware. It does connect to the micro-controller. It's a shame more schematics aren't available for Sunfire units, after all if someone wanted to steal the design they would just reverse engineer it anyway, but that's just the way it is with intellectual property. 2
DMRECONE 15 Posted February 6 Author Posted February 6 OK after some very intensive searching and a bit of shear luck, I think I may have found out a little information of the IC. It appears to be a RENESAS R5F211B4SP R8C/1A Group, R8C/1B Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER. The chip is now obsolete and out of production as far as I can tell. I submitted a service request to Renesas for more information on the screened markings on the chip. The datasheet does state that some models of the chip can be preprogrammed by the manufacturer. Now I'm waiting for a reply and maybe more information on the specific properties of this particular model of the chip. I hope the chip is not damaged as finding the firmware I'm sure will be impossible. Since Sunfire became a subsidiary of Nice North America service and tech info is pretty much non existent from the manufacturer. 2
BobTFM35 3,039 Posted February 6 Posted February 6 @DMRECONE Coupled with your finding in your above post and using a search on your image I hit on this. It might have a chance of being "the chip" and I don't know how to proceed after this. 【Naxin Electronics】Original imported R5F211B4SP C1B4 microcontroller MCU microcontroller chip power supply IC_ Huwo Tao 1
DMRECONE 15 Posted February 6 Author Posted February 6 Yes , I found the same chip and others with different screened lower marking. I'm hoping I can get more clarity on the lower marking from Renesas. I'm thinking it might be either date coding or end user specific code for installed firmware. 2
Half Life 1,087 Posted February 6 Posted February 6 Progress! Definitely let us know what you find. Nicely done!
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now