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Recent content by zhov

  1. Z

    [SOLVED] Toshiba Satellite A305-S6853 malfunction

    So, graphics and memory controller chip fault seems to be the most likely. I'll ask my friends to replace it. Thanks for help!
  2. Z

    [SOLVED] Toshiba Satellite A305-S6853 malfunction

    I disassembled the laptop's screen to check it's flat cable and flat cable connector (part number: 6017B0147801), but saw no visible damage. So it has to be checked by replacement? I tried to reinstall the Windows OS, but the laptop switched off after 2 miniutes, but it doesn't switch off in...
  3. Z

    [SOLVED] Toshiba Satellite A305-S6853 malfunction

    Actually it's the start of third pass. When the pass meter in the first pass reached 100%, the writing "Pass complete, no errors, press Esc to exit" appeared in the center below, and the pass meter started counting from 0% again. On the start of third pass i switched of the laptop. I don't...
  4. Z

    [SOLVED] Toshiba Satellite A305-S6853 malfunction

    Thank you all for reasonable suggestions. I used memtest86 to check the memory and the results are on the photo: So if the screen's flat cable is demaged is it possible to have a norman operation in "safe mode" and in "normal mode" switch offs (like when a desktop computer is unplugged from...
  5. Z

    [SOLVED] Toshiba Satellite A305-S6853 malfunction

    Hello, Could anyone give an advise about this laptop? (model# PSAG0U-02900L) Recently it repeatedly switches off, as if electricity "disappears". And sometimes its display looks like in the photo I've attached. Strange, but in "safe mode" it seems doesn't switch off. In Febuary this year its...
  6. Z

    Question about opamp output Occsilation

    If you want to get 300mV from -1.2V, then what is the reason for using 10uF capacitance in parallel with the 42.2k resistor? Try to remove that capacitor, and check the circuit for oscillations.
  7. Z

    Useful documents about 3GPP

    Re: 3GPP All the specifications from 3GPP are available for free download on the site: www.3GPP.org The official ETSI versions of 3GPP documents can be obtained from: h**p://pda.etsi.org/pda Hope this helps.
  8. Z

    Which field is a better option communication or circuit design?

    Re: career plans The both fields are great. The better for you is the one that you like more, feel more inclined, confident (based on previous experience or hobby) to work in (perhaps for the whole life?). Good luck in your choice!
  9. Z

    GSM questions about HLRs

    Re: GSM question To avoid the concentration of signaling messages from all over a big country in a single spot, a big PLMN, say 25 million subscribers, may have several HLRs, so that each HLR has to maintain the data of about 1–4 million subscribers, depending on the preferences of the network...
  10. Z

    "Panasonic RF-B11" service manual?

    Dear All, Does anybody have a service manual for "Panasonic RF-B11" portable radio? Thanks in advance.
  11. Z

    GSM900 - frequency “reuse pattern“

    Could someone tell what values of frequency “reuse pattern“ are used in modern, operational GSM900 networks with “3 sector” BTS stations? Thanks in advance.
  12. Z

    DC restoration circuits

    dc-restoration circuit design If you can find the book "Electronic Principles" (even earlier editions) by Albert P. Malvino then, I think, it's a good resource to start.
  13. Z

    MOS transistor basics.

    transistor basics When Vds > Vgs − Vt the voltage Vds − (Vgs − Vt) across the pinched-off region(saturated part of the channel) creates a strong electric field, which efficiently transports the electrical charges (electrons or holes) from the strongly inverted region (nonsaturated part of the...
  14. Z

    global system for mobile communication

    Re: gprs vs gsm GPRS is the enhancement of GSM for packet data transfer. Compared to GSM with circuit switched connections and fixed data transfer rates, GPRS offers flexibility: high data transfer rates if there are few users and low rates if there are many users. And in addition billing in...
  15. Z

    Gaussian distribution.HELP!

    Here you'll find a good description of Gaussian or Normal distribution: h**p://en.wikipedia.org/wiki/Normal_distribution Other way of writing the formula: According to that description your suggestion k=0.5*rand(1.5) is not right. If you change the standard deviation...

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