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DENON HEOS-AMP-PLUS SERVICE POLICY

AUDIO - INFO-TIPS
Type: (PDF)
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64.2 KB
Page
2
Category
AUDIO
INFO-TIPS
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  • Also known:
    DENON POLICY HEOS AMP PLUS
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  • See related repair forum topics below. May be help you to repair.
Warning!
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Relevant AUDIO forum topics:
Denon PMA500V amplifier
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
DENON AVC-A11SR erősítő táp hiba
Sziasztok! A készülék bekapcsol, de nem szól, végfokok talán működhetnek, a kimenetükön nincs egyenfeszültség. A tápegység részben, ahol a + és -5 V és a további segédtápok vannak, ott valami hiba lehet, mert több tápfesz hiányzik. Itt a stabilizátor IC-k talán tranzisztorokon keresztül kapják meg a diódahídról a tápfeszültséget és ez a rész egy eléggé bonyolultnak néz ki rengeteg alkatrésszel. A panel aljához nem lehet hozzáférni, mert közvetlen alatta van egy A4 méretű digitális procis panel. Valaki javított már ilyet, esetleg rajz van róla, mert nem találtam sehol sem. Köszi a válaszokat.
Denon PMA-425
Sziasztok! Ezzel az erősítővel az a problémám, hogy halkan szól, de nagyobb hangerőnél kikapcsol a relé és villog a piros led. A végfokot átmértem az rendben van, ezután átkötve a relét rendesen szól, akár teljes hangerőn is, de kikötve újra kikapcsol. Mi lehet a gond, a relét behúzó tranzisztor is jó?
Denon-Heos-AMP HS1 flashes red continuously after a factory reset that fails.
Problem with Denon-Heos-AMP HS1

Cause:

After a factory reset attempt that fails, the following problems occur.
PS
The unit worked just before the factory reset!

Problem:

The device tries to update the firmware automatically (online), but it fails.
The device then flashes red continuously.

According to the service manual, the only option is to load a new factory firmware using a USB dongle.
After many hours of searching the web, I have not been able to find this firmware file.
The service manual refers to an SD (service disk).
The Denon service office does not sell or provide service application software.

I hope for further information/help to solve this problem
Regards Mogens
 
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