Service manuals, schematics, eproms for electrical technicians


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VIEWSONIC FSP228 3F01 POWER SUPPLY SCH service manual (1st page)
Preview of VIEWSONIC FSP228 3F01 POWER SUPPLY SCH [1st page]
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Relevant POWER-SUPPLY forum topics:
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. 
TwinTalker 3300
Sziasztok! Keresem a fenti TOPCOM gyártmányú CB rádió rajzát. Az egyiknek rosz az érzékenysége. Edmundson
Dreambox DM800 HD nincs fejtáp. (Megoldva)
Szevasztok! A fenti készülék nem ad ki fejfeszültséget. Nem tudom melyik tranzisztor, FET végzi e nemes feladatot. Ha tudnátok segíteni milyen pozíciószám alatt keressem, nagy segítség lenne. üdv Dr.Távadó
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Sziasztok. A helyi agroszövetkezet-től behoztak egy MG Navigátor gépet. Az a hibálya, hogy bekapcs.után szalad benne a kép - szávokban lefelé. Gombokra, képernyő érintésre reagál. Szegény kicsit poros, piskos, terepen van használva. Navigációs gépet még nem javítottam, de itt a bizonyára nem a szoftver, hanem a hardver-ben, a kép képzés, vezérlés hibás. Van bárkinek tapasztalata efféle hiba elhárításával? jandu.
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