Hi to all. Unit arrived dead with no power. The problem is with switching power supply. I checked most of the parts, no faulty found. Unable to check PWM ICs. To determine which one has the problem, Service Manual is more than important and necessary. I would appreciate if someone of you can help me find it or send it to me.
Thanks in advance for your kind attention and help.
Regards from Greece,
John
Sziasztok !
Denon PMA-480R erősítőn a mute led villog, kikapcsolás nem segít.Leírás szerint védelem kapcsolt be rajta.
üdv.: András
I have and found most of the voltages as indicated on the circuit diagram, till op amp M 5218P; are near those specifed. The output on the centre of the two power transistors of both the channels are also alright.
While looking at the voltages on test points as mentioned on the page 7 for setting up quiscent current, these cannot be set.
Bit of history, the amplifier was lying unused for long time. Nothing in it has burnt. It was never opened earlier than this time, couple of days back.
While I was probing for voltages with DMM, with probe on collector of TR413 one of the fuses blew up. Later same thing happened on the other channel as well.
With the above as background can a Good Samaritan figure out feasibility of repair.
i am unable to upload service manual as file size is 7.3 mb
Sziasztok!
DENON AVR 1705 készülékhez keresek tápot vagy olyan személyt aki tud ilyet tekercselni. A primer tekercse szakadt.
Előre is köszönöm válaszotok
Üdv: Gábor