Service manuals, schematics, eproms for electrical technicians
HEATHKIT HW-17 2M TRANSCEIVER AND MOBILE POWER SUPPLY SCH
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SERVICE MANUAL
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SERVICE MANUAL
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HEATHKIT HW-17 AND MOBILE POWER SUPPLY HW17 2M HW 17
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Relevant OTHER forum topics:
Sziasztok!
Adott ez a tápegység, amiről egy 47"-os tévé üzemel. Vagyis épp nem teszi, mert elfüstölt benne a.. na ezt nem tudom. Pár napja már javítottam ezt a tápegységet, graetz zárlatos volt. Vélhetően ez az előzmény vislte meg. Most viszont bajban vagyok, mert a látható módon szétégett a secunder oldalon az "izé". Ennek azonosításában kellene segítség, ha lenne valakinek ötlete. Próbáltam fényképezni hátha.. de épp a jelölés égett el.
Köszönettel: Kiss Z.
Adott ez a tápegység, amiről egy 47"-os tévé üzemel. Vagyis épp nem teszi, mert elfüstölt benne a.. na ezt nem tudom. Pár napja már javítottam ezt a tápegységet, graetz zárlatos volt. Vélhetően ez az előzmény vislte meg. Most viszont bajban vagyok, mert a látható módon szétégett a secunder oldalon az "izé". Ennek azonosításában kellene segítség, ha lenne valakinek ötlete. Próbáltam fényképezni hátha.. de épp a jelölés égett el.
Köszönettel: Kiss Z.
Sziasztok!
Ezen töltőnek az akksi csatlakoztatása és a hálózatra kapcsolása után csak a power ledje világít és nem tölt. A funkció nyomógombra nem reagál. Mi lehet a baja?
Üdv.:Ckó
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.
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.
Üdv
Került hozzám egy YH138B neveztü dobozka ami egy mindent vezérlő csoda.
Ez rádiót telefont világítást,stb vezérelt de se kép se hang. A csatija 4 pontos de sejtésem sincs hogy miként tesztelhetném. A belében egy HMS87c1204AP csücsül.
Találkozott már valaki efféle kacattal?
Köszi Laci
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