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Help with ID of blown SMD chip in EHX Nano Metal Muff (U7)

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  • o2bthecream
    replied
    Solved. See photo from another pedal for comparison. It's a TLC2262 dual opamp from Ti. Makes sense, EHX has been using TCL226x in another designs as well, including Deluxe Bass Big Muff Pi.



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  • vintagekiki
    replied
    https://www.coursehero.com/file/46901949/Electro-Harmonix-Metal-Muff-Schematicpdf/
    Electro-Harmonix-Metal-Muff-Schematic

    https://www.freestompboxes.org/viewtopic.php?t=2184
    EHX - Deluxe Big Muff Pi EH3053
    The Deluxe Big Muff Pi has an OTA IC 3080 as a compressor.See #13
    Click image for larger version  Name:	file.php?id=217&mode=view.gif Views:	0 Size:	30.2 KB ID:	937930
    Somewhere passed (new) EH Deluxe Big Muff Pi , no traces left in the bookmarks Click image for larger version  Name:	ludi.gif Views:	0 Size:	951 Bytes ID:	937931
    https://en.audiofanzine.com/fuzz-pedal/electro-harmonix/deluxe-big-muff-pi/editorial/reviews/pi-in-your-face.html

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  • vintagekiki
    commented on 's reply
    The image of the motherboard is OK and it is helpful if it appears somewhere on https.

  • vintagekiki
    replied
    EHX Nano Metal Muff is a relatively new product of New Sensor Corp (2019). Schematics for the EHX Nano series I have not noticed. Judging by the environment, the defective IC is most likely some from the OTA series (CA3080, LM13600 ...)
    May be helpful schematic for Deluxe Big Muff Pi, because it has Noise Gate.

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  • o2bthecream
    replied
    More full pcb photos as requested. All are marked EC-D179 Rev C 2019 Electro-Harmonix New Sensor Corp. PCB with pots attached has two more RC4558 ICs. Really struggling to get my phone to focus on small objects.

    Click image for larger version  Name:	IMG_4323.jpeg Views:	0 Size:	210.1 KB ID:	937833
    Click image for larger version  Name:	IMG_4312.jpeg Views:	0 Size:	253.6 KB ID:	937834
    Click image for larger version  Name:	IMG_4314.jpeg Views:	0 Size:	233.8 KB ID:	937835

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  • o2bthecream
    replied
    Click image for larger version

Name:	IMG_4275.jpeg
Views:	333
Size:	1.18 MB
ID:	937828
    Click image for larger version

Name:	IMG_4277.jpeg
Views:	295
Size:	1.14 MB
ID:	937829
    Click image for larger version

Name:	IMG_4274.jpeg
Views:	291
Size:	1.45 MB
ID:	937830
    Click image for larger version

Name:	IMG_4276.jpeg
Views:	298
Size:	1.18 MB
ID:	937831

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  • The Dude
    replied
    Still waiting for a closeup picture of the chip. There may be enough legible numbers left on the IC to identify it.

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  • J M Fahey
    replied
    I will start tracing out from the controls to see what parts of the circuit they connect to to narrow down the function of the un-identified IC.
    Yes, tracing where tracks (pins) lead to will suggest function.

    To begin with, power it up (guess it blew open and not shorted) , IF a dual Op Amp then pin 4 should be negative or ground, pin 8 should be +V, so near +9V

    IF it leads to Power In jack, it might be a switching supply thingie, think one of those Maxim MAX*** or ICL**** charge pumps which generate -9V (-15V) or double +9V to +18V,etc. .
    Here you might find a Korean version.

    Just to look at it with more possibilities in mind.
    Last edited by J M Fahey; 07-30-2021, 03:17 AM.

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  • vintagekiki
    replied
    Originally posted by o2bthecream
    ... the nano Metal Muff has a noise gate built in ...
    If you don't find it difficult please upload a complete inside photo, nano Metal Muff (PCB lay), because there are several versions
    Last edited by vintagekiki; 07-30-2021, 11:17 AM.

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  • o2bthecream
    replied
    Originally posted by vintagekiki View Post
    Check which labels (type) other ICs have. High probability that EH uses the same IC

    https://www.freestompboxes.org/viewtopic.php?f=1&t=4961

    https://easyeda.com/earthicko/Metal-Muff
    Incidentally, the nano Metal Muff has a noise gate built in which other iterations of the pedal lack. This may account for the difference in ICs in this pedal compared to the other versions. I will start tracing out from the controls to see what parts of the circuit they connect to to narrow down the function of the un-identified IC.

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  • o2bthecream
    replied
    Thanks guys, I've photographed and identified the other chips as best I can. U1, U2, and U5 are RC4558. U6 is LM393. Lettering on U7 doesn't appear to match either of those ICs. U7 also lacks the beveled edge and stripe marking, so I'm still at a loss. It's probably not a Ti chip like the rest.


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  • vintagekiki
    replied
    Check which labels (type) other ICs have. High probability that EH uses the same IC

    https://www.freestompboxes.org/viewtopic.php?f=1&t=4961

    https://easyeda.com/earthicko/Metal-Muff

    Leave a comment:


  • Enzo
    replied
    What is U2 over on the left? I'd wager the blown one is the same type.

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  • The Dude
    replied
    Agree. A picture of the IC close up and in focus would help. The metal muff schematics I've looked at have only 4558 op amp IC's, so that's my best guess without more info.

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  • g1
    replied
    Some of the lettering is still visible. If you can zoom in closer with a picture, someone might be able to identify from what is left of the lettering.

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