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REALISTIC TRC466

OTHER - SERVICE MANUAL
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SERVICE MANUAL
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  • Also known:
    REALISTIC TRC-466 TRC466 TRC 466
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Yamaha KX-250 Cassettedeck output tick noise problem (electronic not mechanical)
There is no service manual of the Yamaha KX-250, anyone? I have fixed the mechanism of this unit, replaced the capstan motor (bad quality shreeking one with a better one), replaced the belts and works perfectly fine. Perfect audio, everything works great. However after testing it many times I reassembled the unit and did another test. Some tick noise is present in the audio.

The tick noise is present when executing a function, for example REW (most worse of all), FF or PLAY (only a few spikes randomly), also when using the remote. It is not a problem of the mechanism (motor) or a ground issue or something like that, disconnected it and problem still exists. Maybe it has something to do with static electricity because I have used the unit without HEAD cables attached to the mainboard (head input pins floating) however the pre-amplification circuit is working fine except of the noise. There are two IC's in this circuit, UPC1330HA head selector and a LA3161 pre-amplifier.

The LA3161 is a 2-channel preamplifier that has a circuit to reject ripple. Is it possible this IC is damaged (because of a (static) spike) and because of that the ripple rejection is no longer working? When I replace this IC the problem is solved?

Any ideas or do have some people any experience with this or recognize the sound behaviour discription? Anyone who can point me into the right direction? 

Many thanks for any reply. 
Discos fényeffekt érzéketlen
Hi!
Lenne nálam egy ilyen 
https://www.djdome.hu/images/speasyimagegallery/albums/3/images/sharky.jpg
Van bent 2 motor.
Az egyik ábrákat forgat egy lámpa elé, a másik színes prizmákkal szétviteti.
Na ezek a motorok nem nagyon akarnak mozogni, ill. keveset fordulnak egy ütemben.
Van a bemeneten egy elektret mikrofon, ha azt kopogtatom, egy LED jelzi, hogy vesz valami jelet, de a motorok csak lustán hajtják végre a parancsot.
Nem hinném, hogy a mikrofon lenne a bibi..

Természetesen az összes chipről legyalulták a feliratot. Nem ismerős Valakinek ez a ketyere?
kösz
Toshiba TLP-T70M projektoron,hogy kell a lámpaidőt resetelni?
Üdvözlet mindenkinek! Toshiba TLP-T70M projektoron,hogy kell a lámpaidőt resetelni?Hibajelenség,hogy kicsi a fényerő de amúgy minden működik.A használati útmutató szerint 3000óra után cserélni kell a lámpát,ebben a készülékben már benne van 3045 üzemóra gondolom ezért vette vissza a fényerőt,ki szeretném próbálni,hogy resetelem akkor visszaadja a teljes fényerőt vagy valami más a baj,mielőtt megveszem hozzá a x*10eFt-os lámpát.Tud valaki ebben segíteni?Előre is köszönöm a segítséget.
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