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Szép napot
Fent említett táp nem jelez hibát állandoan a piros ledcsík világít de nem teljes fénnyel amikor jol mukodott zolden viláfított ha volt hállozat ha megzsunt a hállozat akkor sárgát és sipolt kb 30 sec után hogy akurol mukodik most 2 sec és kikapcsol 
2 darab akumlátor van benne 12v-9Ah mind a ketto vadonat uj fel is tolti 13.8 voltot
mérek amikor kikapcsol
minden segítséget elore is koszonok
János

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. 

This goes to an ancient Grundig radio and the dial glass broke as shown in the photo. there are glass repair kits out there on the market, but not sure if they can fix this kind of break?
The owner is not really looking for 100% originality, but would like to get it as close as I can so it looks mended. Any ideas on the best way?

Üdv!
Ismeri valaki ezt az elektronikát?
2 db 1,5V elemről megy.
Van rajt 2 led.
Az  egyik akkor ég, ha begyújt a vízmelegítő, a másik csak akkor villog, ha alacsony a telep fesz. A forrasztásai ramatyok voltak, még az alacsony telep delejt se jelezte. Átforrasztottam, azt most jelzi.
Tehát nem szikráztat. Nem tudom mi lehet. A kék PP kondi merésre jó, meg a két elko is. Nekem gyanús a nagyfesz rész. Le lehet ezt választani valahogy, és kipróbálni ? Tudna Valaki tanácsot adni eme panellal kapcsolatban?
Kösz