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  1. bertus

    Advice on oscilloscope

    Hello, Perhaps these pages might help: https://www.wikihow.com/Choose-an-Oscilloscope https://www.testandmeasurementtips.com/how-to-select-an-oscilloscope/ Bertus
  2. bertus

    Dell Inspiron 3521

    Hello, You are talking about a PC, but the Dell Inspirion 3521 is a laptop: https://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_inspiron_laptop/inspiron-15-3521_owner%27s%20manual_en-us.pdf Bertus
  3. bertus

    And now something weird

    Google Maps helps Italian police capture mafia fugitive https://edition.cnn.com/2022/01/05/tech/gioacchino-gammino-google-maps-italy-mafia-intl-hnk/index.html
  4. bertus

    Dell Inspiron 3521

    Hello, Perhaps a strange question, but are the fan and heatsink clean? Dust can give a lot of trouble in laptops. Bertus
  5. bertus

    Dell Inspiron 3521

    Hello, Is the noise with or without the power adapter? It looks like the HDD is broken. Bertus
  6. bertus

    CRT TV - Identyfing the right transformer

    Hello, The same question is posted at All About Circuits: What is the right flyback replacement for this tv ? I have seen the report. We do not delete threads. Bertus
  7. bertus

    AOCJY2 10 MHz OCXO time source

    Hello, Could it be a load problem of the potmeter. Bertus
  8. bertus

    Help needed with Sony PVM 14N6U

    Hello, Have a look at the service manual: http://diagramas.diagramasde.com/otros/SSM-20N5U_9976686010-00e.pdf Pages 3-8 and 3-9 are about white balance (color balance) adjustment. Bertus
  9. bertus

    Help needed with Sony PVM 14N6U

    Hello, What was the source of the video signal? The BNC input expects to have a full video signal, with the correct type (PAL / NTSC / SECAM). Bertus
  10. bertus

    Help needed with Sony PVM 14N6U

    Hello, Wich inputs did you use? There are Y/C and Video (BNC) inputs. Bertus
  11. bertus

    Help needed with Sony PVM 14N6U

    Hello, Wich input are you using? The last picture shows Line A, Line B and RGB. Bertus
  12. bertus

    Power Transistor Code Identification help

    Hello, Using the attached crossreference list, the 6552 leads to a MJ15018. The trouble with inhouse numbers is that you can never be sure. I hope it could be of any use. Bertus
  13. bertus

    Happy new year

    Hello, Indeed , stay healthy. I did have my boostershot for corona last wednesday. I will be around "next" year. Bertus
  14. bertus

    MOSFET problem

    Hello, I have made an overview of all parts that are involved by the power switch: The hardware switch pulls down the mosfet by a diode. Bertus
  15. bertus

    Seeking help with 12v dc motor controller on golf buggy #2

    Hello, I have mooved your hijack to a thread of your own. This is the origenal thread: Seeking help with 12v dc motor controller on golf buggy Bertus
  16. bertus

    MOSFET problem

    Hello, When you say that power is available, but the rest is not functional, there must be a signal missing. Looking at the powerswitch schematic, there are 3 signals. One to turn TR101 on and two other signals. Place the mosfet back and remove TR101 and bridge the C-E points and see what...
  17. bertus

    MOSFET problem

    Hello, It looks like the mosfet is used as power switch: You could test if the rest of the piano is working by shorting the pins D and S of the fet. (without the fet). The power switch is disabled and always on. Bertus
  18. bertus

    MOSFET problem

    Hello, As @AnalogKid said, try to retrieve the manual. Perhaps the model is given on one of the pages in this thread: Looking for SERVICE MANUAL FOR SYNTHESIZER & ELECTRONIC MUSICAL INSTRUMENT Bertus
  19. bertus

    CRT TV - Brightness is too high

    Hello, It could well be that the G2 voltage is not correct: https://shmups.system11.org/viewtopic.php?f=6&t=67477 Also the following page will likely help troubleshooting: http://www.repairfaq.org/sam/tvfaq.htm Bertus
  20. bertus

    MOSFET problem

    Hello, The mosfet is likely a TJ20A10M. Bertus
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