Service manuals, schematics, eproms for electrical technicians
USSR MELODIJA.
Type: 
(DJVU)
(DJVU)Size
81.5 KB
81.5 KB
Page
3
3
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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Relevant AUDIO forum topics:
Sziasztok
A fenti IC-t keresem bontottat, ha lenne elfekvőben.
Köszönöm
Sziasztok!
Tippet, segítséget kérnék 3 tálcás Philips 680C midi HiFi hibájának behatárolásához, tapasztalat hiány miatt.
A forgótálca mechanikájában a szíjakat már lecseréltem.
Philips VAM1021 optika
Hiba:
Mindhárom lemezt pozícióba forgatja, a motor a lemezt egy fél körben megmozdítja, majd leáll.
Az optika is 2-3 alkalommal felemelkedik, de fényt nem látok a lencsén üres tálcánál.
Mindhárom lemeznél megismétli, majd NO DISK felirat a kijelzőn.
Köszönöm a válaszokat, üdv: Csaba
https://www.youtube.com/watch?v=TvfBPS2MmmI&feature=youtu.be
https://www.youtube.com/watch?v=I4NwLlZyQQw&feature=youtu.be
Tippet, segítséget kérnék 3 tálcás Philips 680C midi HiFi hibájának behatárolásához, tapasztalat hiány miatt.
A forgótálca mechanikájában a szíjakat már lecseréltem.
Philips VAM1021 optika
Hiba:
Mindhárom lemezt pozícióba forgatja, a motor a lemezt egy fél körben megmozdítja, majd leáll.
Az optika is 2-3 alkalommal felemelkedik, de fényt nem látok a lencsén üres tálcánál.
Mindhárom lemeznél megismétli, majd NO DISK felirat a kijelzőn.
Köszönöm a válaszokat, üdv: Csaba
https://www.youtube.com/watch?v=TvfBPS2MmmI&feature=youtu.be
https://www.youtube.com/watch?v=I4NwLlZyQQw&feature=youtu.be
Találtam ezt a dobozt, az SP-410D aktív subwoofert.
Első mérésre a végfok IC zárlatos.
Ismeri-e valaki ennek a végfok típusát?
2 db. 5W-os, 1 db. 20W-os végfok van egy tokban.
Mérgemben kinyomta a vakerára, de ha kapható lenne ilyen IC, talán érdemes lenne kicserélnem.
Valamire csak jó lenne....
Hi All,
I have a Rotel RA-980BX amp with a blown channel. I have sourced most of the transistors, but am struggling to find the other 4.
Part numbers as follow:
2SC3478
2SC4381
2SA1376
2SA1667
What would be suggested equivalents / suitable replacements?
Also, some advice, I suspect the bias pot to be bad. Based on the circuit, would you think that the bad bias pot would cause the drivers and outputs to blow? Any suggestion on modification to prevent this re-occurring?
Thanks
Regards,
Werner
I have a Rotel RA-980BX amp with a blown channel. I have sourced most of the transistors, but am struggling to find the other 4.
Part numbers as follow:
2SC3478
2SC4381
2SA1376
2SA1667
What would be suggested equivalents / suitable replacements?
Also, some advice, I suspect the bias pot to be bad. Based on the circuit, would you think that the bad bias pot would cause the drivers and outputs to blow? Any suggestion on modification to prevent this re-occurring?
Thanks
Regards,
Werner
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