Service manuals, schematics, eproms for electrical technicians
HEATHKIT HD-1422 ANTENNA NOISE BRIDGE SCH
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SERVICE MANUAL
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SERVICE MANUAL
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Looking for similar heathkit manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar heathkit manual?
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HEATHKIT HD-1422 NOISE BRIDGE HD1422 ANTENNA HD 1422
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Relevant OTHER forum topics:
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.
Sziasztok.
A barátom kivitte upc-s parabolát Hollandiába de nem találja a műhodot:-)
Tud valaki segíteni hogy mit mondjak neki mert nekem fogalmam sincs
hogy hol keresgéljen.
üdv:hifi6
Helló
120V 300W-os fűtőtest,illetve 500W-os motor megtáplálása trafó nélkül kivitelezhető lenne?
Egy diódával próbáltam egy 200W-os izzót sorba kötve, DC ben 90V-ot mértem,AC-ban 120V-ot.
120V 300W-os fűtőtest,illetve 500W-os motor megtáplálása trafó nélkül kivitelezhető lenne?
Egy diódával próbáltam egy 200W-os izzót sorba kötve, DC ben 90V-ot mértem,AC-ban 120V-ot.
Sziasztok!
Van egy kis nyomtatott áramköri lap azt hozták ebben van az LNK303 mi lenne jó helyette, mert nem találok, vagy átsiklottam felette.
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