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Milwaukee M12-18C charger power supply - I am looking for a diagram

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  • #1 17235007
    elektropnik
    Level 2  
    Posts: 3
    Rate: 1
    Hello!
    Does anyone have a diagram of this charger? After introducing the steel chips into the housing, I changed the appearance and I can not figure out what is what in the field of standard elements such as resistors, diodes, capacitors, etc.
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  • #2 17235071
    Pedros050
    Level 43  
    Posts: 17906
    Help: 2471
    Rate: 3901
    Hello. Insert a picture of what it looks like after these steel shavings?
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  • #3 17492284
    Beata223lala
    Level 9  
    Posts: 19
    Rate: 29
    I did an inventory of resistors and zener diodes. It should come in handy (Marking on the resistor in parentheses)
    R21 47 Ohm 5%
    R12 68 k 5%
    R8 51 Ohm 1%

    SMD resistors
    R18, R13, R17 620Ohm (621)
    R69 520 Ohm (521)
    R52, R53, R46, R51, R55 100K (104)
    R58, R59, R25, R14, R87 4.7K (472)
    R75, R76 MEASUREMENT - 57K (01D) 100K
    R91, R89, R36 1K (102)
    R40 1K (01B)
    R56, R84 27K (273)
    R66, R65 2.2K (222)
    R60, R61 510K (514)
    R57 5.1K (512)
    R71, R72, R70 200K (30D)
    R31, R47, R33, R29 200K (204)
    R49, R50 10Om (100)
    R16, R95, R23, R86, R81, R15, R85, R24 10K (103)
    R22, R94 10K (01C)
    R93 measurement -25K (48C) 30.9k?
    R88 0 (000)
    R82 2K (202)
    R30 20K (203)
    R73 measurement - 740K (01E) 1M?
    R74 measurement - 380K (58D) 392k?
    R45 measurement - 40K (59C) 40.2k?
    R83 100Ohm (101)
    R1, R2, R3, R4 470K (474)
    R7 4.3M (4304)
    R6 measurement - 6.4K (79B) 6.49k?
    R10 8.2om (8R2)
    R101 47Ohm (470)
    R90 2K (202)
    R28 330Ohm (331)
    R92 82Ohm (820)
    R20 ???????????????????????????
    R27 510Ohm (511)
    R43 measurement -25K (39C) 24.9k?
    R44 measurement -33K "check" (58D) 392k?

    Zener diodes
    ZD1 18V
    ZD2 ???????????????????????????
    ZD4 39V
    ZD5 4.7V
    ZD6, ZD7 16.7V
    ZD8 5.1V

    Q1, Q2, Q4, Q10, Q11
    1 AM 4 (NPN)

    Q8, Q9
    HK (NPN)

    Q5 Mosfet

    D18, D20
    A7 Z

    Can anyone identify the ZD2 diode ????? and the resistor R20 ?????.
    In the thread "Milwaukee M12-18C, component identification"
    https://www.elektroda.pl/rtvforum/topic3385980.html#16768999

    There is a photo but the resistor marking is not visible and it is best to measure the diode.
    I suppose that ZD2 will be 20V because it is to stabilize the voltage of 22V and in addition there are 0.65V drops, diode and 1.4V optocoupler, hence 22V- 2.05V 19.95V?
    And the R20 resistor looks like 820Om designation (8200) connected in series with 330Om ??????????

    Below is a photo
    Milwaukee M12-18C charger power supply - I am looking for a diagram

    One AOD413A mosfet was also replaced with TO252 AP9567GH,
    both PC817 optocouplers,
    TOP258YN chip blew up
    resistors R8, R20 ????, R92, in R27 the inscriptions burned.
    the zener diode ZDE2 evaporated

    For R20 I gave 820 Ohm and the zener diode 20V. I haven't turned it on yet, I'm waiting for help.
    Milwaukee M12-18C charger power supply - I am looking for a diagram

    Thanks :)
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  • #4 17499482
    Beata223lala
    Level 9  
    Posts: 19
    Rate: 29
    Dear gentlemen, I would like to add that the charger was previously tortured by a fachman, which is why it was in this condition.

    With R20 820? elements, the Zener ZDE2 20V diode, the charger started charging one battery, but on the other one the TOP driver burned down again. The second time I also replaced the R12 68k? / 5% resistor and in its place I put two 150k? MŁT in parallel. Now she has two batteries charged and looks like GIT.

    The voltage at the output of the converter is 21.75 V, and the 18V batteries charge up to 20.7V.

    As soon as the charger plugs into the socket and then removes the plug, I will insert the batteries immediately after removing the plug. Then the charger freezes and you have to wait about 10 minutes before it detects the battery again. [and] Do they have that?
  • #5 17836590
    darek608
    Level 11  
    Posts: 8
    Rate: 6
    Hello.
    Resistor R20 is 82?.
  • #6 18223727
    jaro720
    Level 1  
    Posts: 1
    Rate: 1
    Hello

    Isn't R8 sometimes 5.1M?
  • #7 18237797
    rsv6
    Level 13  
    Posts: 1713
    Rate: 282
    Has anyone displayed some other diode instead of FR107?
  • #8 18882482
    kwiatekcwa
    Level 9  
    Posts: 4
    Rate: 2
    Hello, I would like to refresh the topic.
    I have a broken plate from this charger, unfortunately it fell off that paths continue to U3. I do not know what I would be like, but someone may know the replacement or the original. I would also need information where each leg of this chip is to hit because I do not know.
    greetings

    Added after 30 [seconds]:

    Hello, I would like to refresh the topic.
    I have a broken plate from this charger, unfortunately it fell off that paths continue to U3. I do not know what I would be like, but someone may know the replacement or the original. I would also need information where each leg of this chip is to hit because I do not know.
    greetings
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  • #10 19253015
    stanisławpiotr
    Level 33  
    Posts: 1540
    Help: 209
    Rate: 819
    Hello, I have a problem with the above charger, the batteries are charged for a very long time. I do not know if the problem is the missing capacitor that broke off the board and I have a request if someone could tell me what the value of the c42 capacitor should be.
    Attachments:
    • Milwaukee M12-18C charger power supply - I am looking for a diagram 20210213_110733.jpg (1016.23 KB) You must be logged in to download this attachment.
  • #11 19253182
    stanisławpiotr
    Level 33  
    Posts: 1540
    Help: 209
    Rate: 819
    THANK YOU. capacity is 100nf
    A colleague probably made a mistake Q8 and Q9 is not the HK symbol, but the RK or N mosfet.
  • #12 20606687
    wkrleg
    Level 16  
    Posts: 240
    Help: 8
    Rate: 41
    Milwaukee M12-18C charger power supply - I am looking for a diagram

    What is the value of this capacitor
    Only the touched fell out of print. One leg is burnt.
  • #13 20873610
    Yunion
    Level 1  
    Posts: 1

    I have U1 = TOP265F broken, it blows but cannot find a replacement or information about it.
  • #14 20891947
    Henko70
    Level 13  
    Posts: 34
    Help: 5
    Rate: 7

    >>20606687
    This MKSE capacitor has a value of 472/630V, i.e. 4.7nF/630V.
  • #15 20922550
    gradek83
    Level 43  
    Posts: 9048
    Help: 925
    Rate: 2077
    I am attaching a photo in higher resolution.
    Milwaukee M12-18C charger power supply - I am looking for a diagramM12-18..jpg (11.01 MB)You must be logged in to download this attachment.
  • #16 20935155
    krzycho382
    Level 9  
    Posts: 32
    Rate: 3

    >>20873610
    TOP256 documentation in the attachment.
    Attachments:
    • TOP25x-26x-DTE.pdf (2.94 MB) You must be logged in to download this attachment.
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Topic summary

✨ The discussion revolves around the Milwaukee M12-18C charger, specifically seeking a schematic diagram after damage occurred due to steel chips entering the housing. Users provide detailed information on various components, including resistors and diodes, with specific values and markings. Notable components mentioned include R20 (82 Ohm), R12 (68 k), and Zener diode ZDE2 (20V). Issues with charging performance are noted, including a malfunctioning TOP265F driver and a missing capacitor (C42, 100nF). Users also discuss potential replacements for components and share links to datasheets for the LM358A operational amplifier and TOP256 documentation.
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FAQ

TL;DR: Fix Milwaukee M12-18C charger faults fast: measured 21.75 V output; “The voltage at the output of the converter is 21.75 V.” This FAQ gives part IDs, values, and repair tips for DIY techs and service pros. [Elektroda, Beata223lala, post #17499482]

Why it matters: It speeds accurate troubleshooting when debris damage, blown parts, or unclear markings stall repairs.

Quick Facts

Where can I get a schematic or clear board reference for the M12-18C?

Use the high‑resolution board photo shared in the thread to trace nets and confirm part locations around U1, R20, and ZD2. Print it and annotate while measuring continuity for clarity. [Elektroda, gradek83, post #20922550]

What is the correct value for resistor R20?

R20 is 82 Ω. If your resistor is marked “820,” that is the standard 3‑digit code for 82 Ω, not 820 Ω. [Elektroda, darek608, post #17836590]

What chip is U3 and where can I find its pinout?

U3 is an LM358A dual op‑amp. Use the LM358A datasheet for pin numbers and typical application wiring when repairing lifted pads. [Elektroda, Pedros050, post #18882909]

What does the MKSE code “472/630V” mean?

It denotes a 4.7 nF film capacitor rated at 630 V. Replace with equal capacitance and voltage rating to maintain insulation margin. [Elektroda, Henko70, post #20891947]

What voltages should I see during charging?

One repaired unit measured 21.75 V at the converter output, and 18 V packs charged to about 20.7 V. These figures help sanity‑check regulation after component replacement. [Elektroda, Beata223lala, post #17499482]

My charger locks up for ~10 minutes after unplugging. Is that normal?

A user reported a post‑unplug lockout before battery detection returns. “You have to wait about 10 minutes before it detects the battery again.” This suggests a latched or discharge‑dependent state. [Elektroda, Beata223lala, post #17499482]

How can I determine ZD2’s value when its markings are gone?

Try this: 1. Identify the ~22 V stabilization path. 2. Subtract ~0.65 V diode drop and ~1.4 V optocoupler drop. 3. Fit a ~20 V Zener, then verify with light load before full operation. [Elektroda, Beata223lala, post #17492284]

Can I substitute FR107 with another diode?

Use FR107, or choose a fast‑recovery rectifier meeting ≥1 A, ≥1000 V, and similar reverse‑recovery characteristics. Verify thermal and footprint compatibility before install. “Match or exceed voltage, current, and switching speed.” [“FR107 Fast Recovery Rectifier Datasheet”]

Why did the TOPSwitch blow again after charging one battery?

A repair charged one battery with R20=82 Ω and ZD2≈20 V, then the TOP driver failed on the next pack. After also changing R12 from 68 kΩ to two 150 kΩ in parallel, it charged two packs reliably. [Elektroda, Beata223lala, post #17499482]

Where can I find documentation for the U1 TOPSwitch controller?

The thread includes a shared TOP256 datasheet. Use it to understand the family’s pinout, startup, and protection behavior during troubleshooting. [Elektroda, krzycho382, post #20935155]

What value was logged for R8 in the community parts list?

R8 was recorded as 51 Ω, 1% in the shared inventory. Confirm markings and measure in‑circuit only after discharging capacitors safely. [Elektroda, Beata223lala, post #17492284]

Could R8 be 5.1 MΩ on some revisions?

A user questioned whether R8 is 5.1 MΩ on certain boards. Board variants may differ; verify via the printed code and a DMM measurement. [Elektroda, jaro720, post #18223727]

What are the values of R27 and R92?

R27 is 510 Ω (code 511). R92 is 82 Ω (code 820). Use these to confirm replacements or detect wrong‑value parts after damage. [Elektroda, Beata223lala, post #17492284]

Are Q8 and Q9 MOSFETs? The marking doesn’t look like “HK.”

Yes. A correction notes Q8 and Q9 markings are not “HK,” but read as “RK” or an “N” MOSFET. Cross‑check with your board markings. [Elektroda, stanisławpiotr, post #19253182]
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