TM2 does not adjust the 5v point (PT1)

Discuss Nava construction and related issues
  • another_universe
    Posts 28
    Joined: Oct 17th, '15, 15:13

    Check carefully all ics in the sequencer area !
  • jens van daele
    Posts 7
    Joined: Oct 3rd, '16, 21:32

    another_universe wrote:Check carefully all ics in the sequencer area !
    I did this now, there was one reversed.. I've put him normal position.
    But the 10v stays the same.
    Thanks in advance!!
  • User avatar
    KlangGenerator
    Posts 371
    Joined: Aug 8th, '16, 16:36

    If you reversed the IC and powered up the Nava it might be defective now...
  • jens van daele
    Posts 7
    Joined: Oct 3rd, '16, 21:32

    Replaced the defective IC's in sequencer..
    Now i get 11,41v dc btween gnd and tp1..

    No contrast on lcd anymore (had working lcd last time)

    I REALLY DON'T KNOW WHAT TO DO :/

    Does somebody repairservice against payement?
    i don't think i could solve this problem without
    Getting fried components.

    Thanks in advance people!!
  • lukep_gdansk
    Posts 105
    Joined: Dec 22nd, '16, 17:04

    Check both trimmers and resistors for correct value. After that check voltage on pins from TL (datasheet for that) and check caps near TM2 and TL074 (white ones).

    good luck
  • Alex808
    Posts 7
    Joined: Sep 6th, '16, 14:25

    Hi, you have to turn the screw clockwise long time to achieve the 5V. You can turn it until it clicks quietly. But it works.
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