Service manuals, schematics, eproms for electrical technicians
DRAKE 1-A RECEIVER SCH
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SERVICE MANUAL
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SERVICE MANUAL
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Looking for similar drake manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar drake manual?
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DRAKE RECEIVER 1A 1-A
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Relevant OTHER forum topics:
köszöntem
MERCURY Smart PRO 1200
javitani kell,de hiányzik egy alkatrész
a nyák lapon ugy van jelölve,hogy DS1
gömbölyű,mintha elko nak a helye lenne
mi lehet az?
MERCURY Smart PRO 1200
javitani kell,de hiányzik egy alkatrész
a nyák lapon ugy van jelölve,hogy DS1
gömbölyű,mintha elko nak a helye lenne
mi lehet az?
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,
Vettem a kínaiaktól egy uPC1237-es IC-vel szerelt (datasheet itt) hangszóró védő panelt (link). Feltérképeztem a kapcsolását is, itt található. A probléma a következő vele: abban a pillanatban, hogy rákerül a relé tekercse, lekapcsolja magát. Nem számít, hogy bekapcsoláskor már rá volt kötve (ekkor fel sem kapcsolja magát), vagy utólag teszem rá. Nem induktív terheléssel is ezt csinálja. Két különböző IC-vel, két különböző panelen is ugyanez. MI lehet a baja?
szervusztok
Sencor SDB 4002M4 tipusu DVBT keszulekhez kernek Toletek szoftwaret,illetve memoriatartalmat.
koszi
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