Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Rotel RA 1570
#23
(03-24-2020, 08:51 AM)Vlada021 Wrote: Baš na samom izlazu, na samoj pločicipre releja, tačka gde se sreću svi emiterski otpornici. Postoje TP1 i TP2, na njma se meri pad napona na emiterskim otpornicima (mirna struja). Gledam u ovaj pdf što sam okačio, kaže 5mV,merim onu ušoranu stranu - kreće polako od 3.7mV pa je tu oko 4.5mV,ova druga strana koja kao "nema" problem pokazuje 20+mV... Dali je moguće da povećana mirna struja brlja na protekciji?, mislim, to je samo 4 puta više.
P. S. Mada opet, releji su otkačili dummy load tako da ne vidim kako može pravilno da se izmeri pad napona na tim otpornicima... (ili sam glup)

Mirna struja izlaznih teče isključivo preko emiterskih otpornika izlaznih
i prisutna je iako nemamo na izlazu okačeno ništa!
Teče isključivo iz POS raila preko izlaznih i njihovih emiterskih otpornika do NEG raila.
Ako bi imali DC offset i istovremeno okačeno opterečeje, nešto deviacije mirne struje sigurno bi imeli,
ali to nije ovaj primer. Imaš mali DC offset, pa i opterečenje je otkačeno povodom protekcije zvučnika.

Mirna struja se u početku menja/viša/niža do nekog SteadyState nivoa,
a to je do nakon nekih 15min+
kad se temp u pojačalu/hladnjaku/po segmentima/u kutiji samoj stabilizira!

Podesi mirnu struju i DC Offset (ako ima podešavanje DC offseta) po ServiceManualu

Trebam si oduzeti nešto vremena i čekirati tu protekciju, znači pogledati sve ulaze protekcije
AC presence koja nadgledava prisutnost AC napona sekundara trafoa
onda Softstart ili ON Delay
Thermal protekciju ako je ima
DC OUT protekciju i njezin nivo okidanja (recimo +1V / -2V)
OverCurrent i/ili Short-to-GND protekciju
...
U medju vremenu prečekiraj odakle se uzimaju signali za ove gore navedene protekcije!
Tako češ saznati i koji su nivoi okidanja po protekcijama!
LP
Dragan
Reply


Messages In This Thread
Rotel RA 1570 - by Vlada021 - 10-02-2019, 05:20 AM
RE: Rotel RA 1570 - by HomeMadeAudioProject - 10-02-2019, 04:02 PM
RE: Rotel RA 1570 - by Vlada021 - 10-02-2019, 06:54 PM
RE: Rotel RA 1570 - by branko tod - 10-02-2019, 08:02 PM
RE: Rotel RA 1570 - by Vlada021 - 10-02-2019, 10:03 PM
RE: Rotel RA 1570 - by branko tod - 03-12-2020, 12:46 PM
RE: Rotel RA 1570 - by Vlada021 - 03-12-2020, 08:01 AM
RE: Rotel RA 1570 - by Vlada021 - 03-12-2020, 12:00 PM
RE: Rotel RA 1570 - by Khadgar2007 - 03-12-2020, 12:12 PM
RE: Rotel RA 1570 - by Dragan100 - 03-12-2020, 02:16 PM
RE: Rotel RA 1570 - by Vlada021 - 03-12-2020, 09:38 PM
RE: Rotel RA 1570 - by emiSAr - 03-12-2020, 11:32 PM
RE: Rotel RA 1570 - by Vlada021 - 03-12-2020, 11:46 PM
RE: Rotel RA 1570 - by Vlada021 - 03-13-2020, 06:35 AM
RE: Rotel RA 1570 - by Vlada021 - 03-21-2020, 01:13 AM
RE: Rotel RA 1570 - by Vlada021 - 03-21-2020, 10:55 PM
RE: Rotel RA 1570 - by Vlada021 - 03-23-2020, 06:00 AM
RE: Rotel RA 1570 - by Vlada021 - 03-24-2020, 08:01 AM
RE: Rotel RA 1570 - by HomeMadeAudioProject - 03-24-2020, 08:06 AM
RE: Rotel RA 1570 - by Vlada021 - 03-24-2020, 08:30 AM
RE: Rotel RA 1570 - by Khadgar2007 - 03-24-2020, 08:46 AM
RE: Rotel RA 1570 - by Vlada021 - 03-24-2020, 08:51 AM
RE: Rotel RA 1570 - by Dragan100 - 03-24-2020, 12:15 PM
RE: Rotel RA 1570 - by Vlada021 - 03-24-2020, 12:35 PM
RE: Rotel RA 1570 - by Vlada021 - 03-24-2020, 01:09 PM
RE: Rotel RA 1570 - by Dragan100 - 03-24-2020, 02:37 PM
RE: Rotel RA 1570 - by Dragan100 - 03-24-2020, 03:18 PM
RE: Rotel RA 1570 - by Dragan100 - 03-24-2020, 03:27 PM
RE: Rotel RA 1570 - by Vlada021 - 03-25-2020, 12:21 AM
RE: Rotel RA 1570 - by Vlada021 - 03-25-2020, 03:06 AM
RE: Rotel RA 1570 - by Vlada021 - 03-25-2020, 08:54 AM
RE: Rotel RA 1570 - by Dragan100 - 03-25-2020, 09:23 AM
RE: Rotel RA 1570 - by Vlada021 - 03-25-2020, 09:44 AM
RE: Rotel RA 1570 - by Dragan100 - 03-25-2020, 11:39 AM
RE: Rotel RA 1570 - by Vlada021 - 03-25-2020, 12:26 PM
RE: Rotel RA 1570 - by Dragan100 - 03-25-2020, 02:35 PM
RE: Rotel RA 1570 - by Vlada021 - 03-26-2020, 12:51 PM
RE: Rotel RA 1570 - by Dragan100 - 03-26-2020, 05:33 PM
RE: Rotel RA 1570 - by Vlada021 - 03-27-2020, 01:43 AM
RE: Rotel RA 1570 - by Dragan100 - 03-27-2020, 08:38 AM
RE: Rotel RA 1570 - by HomeMadeAudioProject - 03-27-2020, 03:13 AM
RE: Rotel RA 1570 - by Vlada021 - 03-27-2020, 03:16 AM
RE: Rotel RA 1570 - by HomeMadeAudioProject - 03-27-2020, 03:31 AM
RE: Rotel RA 1570 - by Dragan100 - 03-27-2020, 08:43 AM
RE: Rotel RA 1570 - by Vlada021 - 03-27-2020, 03:39 AM
RE: Rotel RA 1570 - by Vlada021 - 03-27-2020, 09:22 AM

Forum Jump:


Users browsing this thread: 24 Guest(s)