Online UPS input 220VAC high cut - low cut filter PCB troubleshoot.

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • ithe
    New Member
    • Oct 2023
    • 8
    • India

    #1

    Online UPS input 220VAC high cut - low cut filter PCB troubleshoot.

    Hi,
    This online UPS is not detecting Mains 220V AC input, by observation I found a SMD Capacitor (C6 which responsible to operate the relay next to R27) is burnt in 220VAC high cut - low cut filtering PCB.
    Please share me a suitable capacitor value for this circuit.


    Click image for larger version

Name:	WhatsApp Image 2024-07-16 at 9.04.36 PM.jpg
Views:	342
Size:	753.3 KB
ID:	3312515Thanks
    Attached Files

    if you find these attachements useful please consider making a small donation to the site

Related Topics

Collapse

  • cheese007
    Input Filter Filling: How to Choose Components?
    by cheese007
    Recently acquired one of those silly Logisys acrylic power supplies and lucked into getting one of the "better" ones (most of an input filter, bridge rectifier instead of 4 diode treatment, OK-sized heatsinks, etc.) and wanted to fill out what I can on the board + get some decent caps on there (especially the primary side since I highly doubt the ones in there are actually 1000uf). My questions are:

    1. How do I know what components to install re: the input filter? It seem to be missing an X cap, a resistor, and a Y cap.
    2. Where can I find a good heatsink for the bridge...
    12-06-2023, 09:59 AM
  • ugamazing
    820-02020 Super Weird Issue: Keyboard Input Character Map "Wrong"?
    by ugamazing
    So, I have a really bizarre issue that I'm struggling to identify the cause of. Working on an 820-02020 board with some bizarre keyboard/input-source character mapping. My suspicion is a possible damaged SPI ROM (U1970), perhaps, but I'm really not sure in this case:

    1. The issue is pretty weird, but when installing MacOS, I noticed my WiFi password did not work. I quickly realized the special characters (!@#$%^& etc) were not mapping correctly.

    2. I noticed the keyboard layout/input-source is defaulting to JAPANESE every single time I restore the board. I am not...
    04-10-2024, 08:06 AM
  • Document Archive
    Texas Instruments bq24745 bq24745RHDR bq24745RHDT Battery Charger IC for Laptop Computers Datasheet
    by Document Archive
    The bq24745 bq24745RHDR bq24745RHDT is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm x 5 mm QFN package.

    The bq24745 features dynamic power management...
    10-23-2024, 02:50 AM
  • Agent24
    Dick Smith Q-1760 linear power supply filter capacitor question
    by Agent24
    I have acquired a used Dick Smith Q-1760 power supply - although the OEM is Manson Industrial
    It has at least one problem.

    The voltage control potentiometer VR2, 50K is faulty - going high resistance / open circuit in the CCW end and leading to the output voltage jumping around.
    I have already ordered a replacement potentiometer, so that's not an issue.

    Now, I want to replace all three electrolytics on the PCB as they are CapXon and I don't trust them so much, I will replace them with something better while I've got the thing apart anyway.
    All are CapXon...
    10-21-2025, 05:39 PM
  • Califauna
    Help with boom box modification
    by Califauna
    Hi, this is more of a project help request than a troubleshooting question. I hope I can post it here.

    I have a W-King D8 Bluetooth boom box which I'd like to modify with some external speaker output jacks and some buttons to switch the internal speakers on and off.

    From factory the specs of the boom box are:

    -Power Input: DC 5V
    -Speaker Output Power: 2 x 25W ( confirmed by Youtube channel Hartdegen review as 12.5W RMS per channel)
    -Drivers:
    -2 x Woofer, 70mm, 10Ω, 70mm,15W
    -2 X Tweeter, 8Ω, 30mm,10W x 2
    -Frequency...
    12-04-2021, 01:53 PM
  • Loading...
  • No more items.
Working...