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RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board

Świr 14790 27
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16796521
    Świr
    Level 34  
    I need to identify two elements (their values) on the board (PST417F) from the above mentioned columns. One is a choke marked L502 and a capacitor marked C76.
    Will someone help?
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  • #2 16797077
    yogi009
    Level 43  
    Photo, buddy, clear photo of this plate (on both sides) ... it will be hard to remember.
  • #3 16797464
    Świr
    Level 34  
    Here you are (better my camera can't):
    RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board
  • #4 16797551
    yogi009
    Level 43  
    I see two outputs, either find the schematic (which may not be easy) or measure these items in the second column. Do you have access to capacitance and inductance measuring instruments? Expect this capacitor to be something a la 100nF, but it's shooting in the dark. However, it is better to measure.
  • #5 16797555
    Świr
    Level 34  
    The measurement from the second column is out of the question. Unless someone has better meters than mine. I need the value of these items preferably from a service shop. This capacitor is not 100nF. Unfortunately.
  • #6 16797575
    yogi009
    Level 43  
    Have you tried to write a mail asking the manufacturer for a diagram? Crate didn't bother me with that.
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  • #7 16797642
    Świr
    Level 34  
    Haven't tried - but a good suggestion. I'll try tomorrow.
  • #8 16806642
    Świr
    Level 34  
    Unfortunately - the Italians are silent.
  • #9 16806726
    yogi009
    Level 43  
    Call me, it's better handled over the phone.
  • #10 17003817
    borys.stw
    Level 9  
    RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board
    Hello, the question as above is only about one tiny element that has been lost to me. What is a coil, resistor or maybe a jumper?

    Thank you in advance for your help and best regards.
  • #11 17003873
    yogi009
    Level 43  
    A colleague of neither pear nor parsley in someone else's thread puts in some photos? In addition, in the photo, both elements are in place.
  • #12 17004088
    borys.stw
    Level 9  
    I borrowed a photo to show the item that was lost. There is no need to set up a new topic.
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  • #13 17004188
    yogi009
    Level 43  
    I wonder if the forum rules also see the need.
  • #14 17004191
    borys.stw
    Level 9  
    One simple question, what is this item. The subject speaks of the device in question and the same problem that I have. So why should I set up another topic, how can I refresh it?
  • #15 17004243
    yogi009
    Level 43  
    RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board

    You mean the C130? The description suggests a capacitor. Give the markings of these mosfets, maybe the application will tell you something (I would always start with 100nF).

    Added after 5 [minutes]:

    RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board

    Still slightly edited for better readability.
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  • #17 17004759
    yogi009
    Level 43  
    pikarel wrote:
    The capacitor is marked with a black arrow and there should be no problems with identifying the type of element.


    And what capacity do you read from? :-)
  • #18 17005351
    pikarel
    Level 38  
    A colleague clearly asked:
    Quote:
    (...) What is a coil, resistor or maybe a jumper?
    Thank you in advance for your help and best regards.

    and I answered the question exactly.
    Electronics is a science, not poetry.
  • #19 17005618
    yogi009
    Level 43  
    You are literally right, but in practice it adds little to the topic.
  • #20 17014144
    borys.stw
    Level 9  
    Hello, I was able to determine that VR3 is a thermistor, but I do not know what resistance it should have and whether it is an NTC or PTC thermistor.

    Please help.
  • #21 17014676
    pikarel
    Level 38  
    borys.stw wrote:
    Hello, I was able to determine that VR3 is a thermistor, but I do not know what resistance it should have and whether it is an NTC or PTC thermistor.

    Please help.

    It is located next to the rectifier circuit, so maybe it is an NTC with a value of single ohms, used to protect the diodes against too high a charging current of the capacitor.
    In the photo I cannot see if VR is connected to ground or to a thin path leading to the via, which is very important as it determines whether it is a varistor or a thermistor.
  • #22 17014707
    borys.stw
    Level 9  
    RCF Art 715: Identifying L502 Choke & C76 Capacitor Values on PST417F PCB Board 100% is a thermistor because on the other side is VR4 and it is a thermistor at the mains voltage input. One leg goes to the optocoupler emitter, the other leg goes towards the dsp and power amplifier. In the evening I will find out where exactly.

    I measured this arrangement:
    [url=https://obrazki.elektroda.pl/8624278200_1517861327.jpg]
  • #23 18945881
    kanmar
    Level 2  
    Hello. And how did it end with this rcf? Because it's the same for me.
  • #24 18946843
    Świr
    Level 34  
    I sent the amplifier to the man who handles it. He fixed it.
  • #25 18947292
    kanmar
    Level 2  
    You didn't ask what was damaged?
  • #26 18947316
    Świr
    Level 34  
    I just checked on an email. Repair description: "Repair of the audio input circuit".
  • #27 19893689
    mediaitechnika
    Level 5  
    Hello colleagues ... I'm sorry, but allow me to join the discussion. I have a similar problem as above. friend. Does anyone have the parameters of this L502 choke from the system? Or maybe you have a service manual. Thank you in advance and best regards
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Topic summary

The discussion revolves around identifying the values of a choke (L502) and a capacitor (C76) on the PST417F PCB board associated with the RCF Art 715 audio equipment. Users suggest obtaining a clear photo of the board and recommend measuring the components if schematics are unavailable. One user mentions that the capacitor is likely not 100nF, and another suggests contacting the manufacturer for a schematic. There are also inquiries about a thermistor (VR3) and its characteristics. Ultimately, one participant successfully repaired their amplifier, indicating that the audio input circuit was the issue.
Summary generated by the language model.
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