Service manuals, schematics, eproms for electrical technicians
LOTUS FOUR-VALVE-AC DOUBLE RF-STAGES RECEIVER 1933 SCH
Type: 
(PDF)
(PDF)Size
225.0 KB
225.0 KB
Page
2
2
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
If you get stuck in repairing a defective appliance download this repair information for help. See below.
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar lotus manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar lotus manual?
Advertisements
Document preview [1st page]
Click on the link for free download!
Document preview [2nd page]
Click on the link for free download!
Advertisements
Please tick the box below to get download link:
- Also known:
LOTUS DOUBLE RFSTAGES RECEIVER 1933 FOUR VALVE AC RF STAGES RF-STAGES
- If you have any question about repairing write your question to the Message board. For this no need registration.
- If the site has helped you and you also want to help others, please Upload a manual, circuit diagram or eeprom that is not yet available on the site.
Have a nice Day! - See related repair forum topics below. May be help you to repair.
Warning!
If you are not familiar with electronics, do not attempt to repair!
You could suffer a fatal electrical shock! Instead, contact your nearest service center!
Note! To open downloaded files you need acrobat reader or similar pdf reader program. In addition,
some files are archived,If you are not familiar with electronics, do not attempt to repair!
You could suffer a fatal electrical shock! Instead, contact your nearest service center!
so you need WinZip or WinRar to open that files. Also some files are djvu so you need djvu viewer to open them.
These free programs can be found on this page: needed progs
If you use opera you have to disable opera turbo function to download file!
If you cannot download this file, try it with CHROME or FIREFOX browser.
Translate this page:
Relevant AUDIO forum topics:
Üdv Philips CD104-el szenvedek 1 napja, minden működik csak hang nem jön ki belőle, de ha a reed relés zajzár reedjeit átkötöm egy vezetékkel akkor szól szépen és tisztán, esetleg ötlete valakinek?
Sziasztok!
A fent említett hifi, most már működik, csak a CD rész nem indul, mert ha megnyomom az open gombot azt írja a kijelző hogy LOCKED, mi a fene lehet vele, meg forgatja a lemeztartót, fejet is megemeli. Segítségeteket előre is köszi!
Hello everyone,
I've this speaker model:
RCF art 415-A.
The power supply is faulty, no votltage out to the amplifier.
The Mosfets are blown. I've changed the mosfets and it's driver, and still have a problem.
I tried to switch on but only one of the mosfets gets hot (the one which switches the 310. There are 2 of them - Mos5 in the scheme).
Obviously I turned it off.
1) What causes it to heat?
2) Testing the VCC of the LMC555, it's only 2.7V. When taking it out of the circuit, it's 12VDC! What makes the voltage to drop. Where does the supply of the LMC555 come from? The VCC of the 555 should be around 10V, as compared with a good card.
I've changed the 555, but the problem remained. I've checked the components around, resistors and capacitors, and transistors, and seem to be OK.
4) The VCC of the Mosfet driver is 10V, but should be 12V if compared with a good card.
3) Could the trafo be damaged? Are these parts reliable or may blow up?
4) What is the purpose of the optocoupler in the circuit?
I would really appreciate any help.
I didn't find the 100% schemes for this RCF (400), but found a very similar one (The 600 version).
name and a link here to download the pdf.
DigiPRO600B
https://elektrotanya.com/db-technologies_digipro600b_sch.pdf/download.html
Regards and many thanks
I've this speaker model:
RCF art 415-A.
The power supply is faulty, no votltage out to the amplifier.
The Mosfets are blown. I've changed the mosfets and it's driver, and still have a problem.
I tried to switch on but only one of the mosfets gets hot (the one which switches the 310. There are 2 of them - Mos5 in the scheme).
Obviously I turned it off.
1) What causes it to heat?
2) Testing the VCC of the LMC555, it's only 2.7V. When taking it out of the circuit, it's 12VDC! What makes the voltage to drop. Where does the supply of the LMC555 come from? The VCC of the 555 should be around 10V, as compared with a good card.
I've changed the 555, but the problem remained. I've checked the components around, resistors and capacitors, and transistors, and seem to be OK.
4) The VCC of the Mosfet driver is 10V, but should be 12V if compared with a good card.
3) Could the trafo be damaged? Are these parts reliable or may blow up?
4) What is the purpose of the optocoupler in the circuit?
I would really appreciate any help.
I didn't find the 100% schemes for this RCF (400), but found a very similar one (The 600 version).
name and a link here to download the pdf.
DigiPRO600B
https://elektrotanya.com/db-technologies_digipro600b_sch.pdf/download.html
Regards and many thanks
Üdv mindenkinek.
Kérnék egy kis segitséget a fentemlitett minihifi javitásában.
A készüléket sok idö után vettem elö,nem volt használva,gondoltam kitakaritom elinditom.
Inditásnál rádio,erösitö,hangszinszabájozó ok.
A kazetta része lejátszáson a csévélö csonk nem forog,tekerés megy mind a két irányba.
Szétszedtem és a fogaskerék ami kapcsolodik a csonk és a hajtótengely közzé le van darálva a fogai,logikus ,hogy nem forog.
Ha van valakinek ilyen mechanikája vagy fogaskerék vagy valamilyen módon tudna segiteni Szépen köszönném.
Tudom a készülék nem egyy csúcskategória,de nekem megérné megjavitani,sajnálom szétszedni vagy kidobni.
Próbálok képeket is feltenni mert úgy könnyebb beazonositani ,hátha van valakineg elfekvöben alkatrésze.
Kérnék egy kis segitséget a fentemlitett minihifi javitásában.
A készüléket sok idö után vettem elö,nem volt használva,gondoltam kitakaritom elinditom.
Inditásnál rádio,erösitö,hangszinszabájozó ok.
A kazetta része lejátszáson a csévélö csonk nem forog,tekerés megy mind a két irányba.
Szétszedtem és a fogaskerék ami kapcsolodik a csonk és a hajtótengely közzé le van darálva a fogai,logikus ,hogy nem forog.
Ha van valakinek ilyen mechanikája vagy fogaskerék vagy valamilyen módon tudna segiteni Szépen köszönném.
Tudom a készülék nem egyy csúcskategória,de nekem megérné megjavitani,sajnálom szétszedni vagy kidobni.
Próbálok képeket is feltenni mert úgy könnyebb beazonositani ,hátha van valakineg elfekvöben alkatrésze.
Similar manuals:
If you want to join us and get repairing help please sign in or sign up by completing a simple electrical test
or write your question to the Message board without registration.
You can write in English language into the forum (not only in Hungarian)!
or write your question to the Message board without registration.
You can write in English language into the forum (not only in Hungarian)!
E-Waste Reduce