Toshiba sdp7000 no sound

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  • Francesc V.
    Tele-master AS-20 amplifier. No output sound, just noise
    by Francesc V.
    Hi:

    I bought this amplifier from the 70s to try to repair it. So far it has no output sound, just noise. You can volume it up and down.

    I've checked fuses and all are ok.
    I've continued with capacitors:
    • The main black one should have 4700uF, but it has lost half of its capacity during these years.
    • The ones that I've numbered have still a really low ESR and the full capacity after ¿40 years?



    The 4 transitors are perfect. Desoldered and tested individually.
    There are also components which I don't know exactly what they are....
    02-16-2023, 07:55 AM
  • Cornboats
    faulty loudspeaker amplifier-no sound output
    by Cornboats
    I've several amplifiers of different sizes which are faulty. I haven't fixed them because I haven't a clue. This is the smallest culprit. 240v in (UK) and 12v dc to the board. Small neon lights when power button is on. Different dc voltages across all of the capacitors. Where do I go from here?
    04-25-2024, 04:43 AM
  • Jedi134
    Uniden bearcat UBC 360clt no sound output
    by Jedi134
    Hi I have inherited the above desktop scanner, all seems to work correctly but there is no sound output. The only sound I do get from the speaker is the beep confirmation when you press a key. No output from the headphone socket either. Not even radio static with squelch fully turned down, tried a reset by holding 2, 9, and hold buttons but still no sound, does anyone have any experience with these scanners, thanks.
    05-13-2024, 04:12 AM
  • UserXP
    Mackie CR4 amplifier no sound
    by UserXP
    Hi, people.

    I've got an amplifier assembly from Mackie CR4 parts. It's just an amplifier, there was no speaker housing, so I used my set of CR4s to test it.

    Anyway, upon connecting everything and hooking the "new" amplifier to an audio source, the sound played clearly and strongly for the first ten seconds. I was happy it was working. Then the sound started to fade out during the playback until it was no more. After it had "dropped to zero", there were two very short intervals of sound playing at the normal volume, as if the amplifier was trying to...
    10-17-2020, 05:06 PM
  • Document Archive
    Toshiba Portege R30-C Notebook Specification for Upgrade or Repair
    by Document Archive
    This specification for the Toshiba Portege R30-C Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the R30-C boardview and R30-C schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for Toshiba Portege...
    09-06-2024, 05:30 AM
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