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HILTI C 7/36-ACS 230V Battery Charger Not Turning On: Fuse F1 & Transistor Q2 Issues

andromeda2344 9480 12
Best answers

How can I repair a Hilti C7/36-ACS battery charger that no longer powers on after finding fuse F1 blown and transistor Q2 shorted?

Replace the faulty parts, but also check the large electrolytic capacitor and nearby components because another failed part may have caused F1 and Q2 to blow. The big capacitor should be inspected carefully; if its plastic top sleeve is peeling, it likely needs replacement [#19171154] [#20370715] Before changing parts, discharge the big capacitor with a 500–800 Ω resistor and check the resistors near Q2, especially the low-value shunt resistor [#20766306] Also test the bridge rectifier, main filter capacitor, and look for any heat-damaged or abnormal surrounding parts, since the root cause may be elsewhere in the power stage [#21824349]
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  • #1 19066312
    andromeda2344
    Level 2  
    Posts: 3
    Greetings to everyone, my Hilti C7 / 36-ACS charger doesn't want to turn on anymore. I found fuse F1 blown, and transistor Q2 shorted. Can anyone help me with the wiring diagram?

    P.S. Sorry for my bad English. HILTI C 7/36-ACS 230V Battery Charger Not Turning On: Fuse F1 & Transistor Q2 Issues
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  • #2 19171154
    aronmiso
    Level 7  
    Posts: 13
    Rate: 24
    Hello,
    for what do you need wiring diagram? just replace faulty components and try if it works.
    I would check also at least this big capacitor
    Good luck
  • #3 19171559
    wojtek 9007
    Level 40  
    Posts: 3939
    Help: 711
    Rate: 846
    Hello - the electrolyte is probably damaged, please check.

    Added after 40 [seconds]:

    HILTI C 7/36-ACS 230V Battery Charger Not Turning On: Fuse F1 & Transistor Q2 Issues
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  • #5 19898043
    flaviodif
    Level 1  
    Posts: 1
    Hi,

    Can you please tell me the name code of IC1?

    Many thanks! 🙏
  • #6 20370715
    azaghorth
    Level 8  
    Posts: 41
    Rate: 11
    It looks like the plastic cover from the big cap is "peeling" off from the top, this is the sign that the cap needs to be replaced. The "peeling" may be from the bottom also. Replace that cap too
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  • #7 20765943
    runingfontteide
    Level 1  
    Posts: 1

    >>19171154
    IC1 reventado
  • #8 20766306
    azaghorth
    Level 8  
    Posts: 41
    Rate: 11

    Hello,
    Check also the resistors near the transistor, especially one that is the shunt (low resistance). Always use a 500-800 Ohm resistor to discharge the big cap before replacing it.
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  • #9 21256918
    keklikozcan
    Level 5  
    Posts: 6
    Rate: 7
    Hi I have a problem. When I plug the battery, charger starts, fan works and after 10 seconds charger stops. Did anyone solve this problem? I replaced L6599AD IC and MIP2M2 IC but same. Relay, triac, mosfets, all zener diodes good. Battery is good. Anyone can help me?
  • #10 21639574
    zakrouf
    Level 2  
    Posts: 2
    The problem is in the battery charge level measurement line.
  • #11 21811553
    audiovideo416
    Level 3  
    Posts: 7
    Rate: 2
    >>21639574 zakrouf, I have the same problem. After 10 seconds of inserting the battery, the charger turns off. Even when it's on you can't hear any relay or fan. In standby, the light comes on for 10 seconds and then turns off. In the post you said "The problem is in the battery charge level measurement line." What should I check? Thanks, @zakrouf
  • #12 21812406
    audiovideo416
    Level 3  
    Posts: 7
    Rate: 2
    @zakrouf zakrouf, I have the same problem. After 10 seconds of inserting the battery, the charger turns off. Even when it's on, you can't hear any relay or fan. In standby, the light comes on for 10 seconds and then turns off. In the post, you said "The problem is in the battery charge level measurement line." What should I check? Thanks, @zakrouf
  • #13 21824349
    michaeljamesromt
    Level 6  
    Posts: 19
    If the F1 fuse and Q2 transistor are both damaged, there is a good chance another part caused the failure, such as a shorted rectifier, capacitor, or power IC. Replacing only those two parts may not solve the problem. It can help to check surrounding components for heat damage or unusual readings first. Have you already tested the bridge rectifier and main filter capacitor for faults?
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Topic summary

✨ The discussion concerns a Hilti C 7/36-ACS 230V battery charger that no longer powers on after fuse F1 blew and transistor Q2 shorted. Suggested troubleshooting focuses on replacing the failed parts, checking the large electrolytic capacitor for damage or bulging, inspecting nearby resistors including the low-ohm shunt resistor, and verifying the bridge rectifier, main filter capacitor, and surrounding power components for additional faults. One reply points to a related repair thread for similar charger behavior, and later comments mention IC1 damage and a separate symptom where the charger starts briefly with a battery inserted and then shuts down after about 10 seconds, possibly related to the battery charge level measurement line.
Summary generated by AI based on the discussion content.
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