Service manuals, schematics, eproms for electrical technicians
BELMONT RADIO CORP. 667 SCH
Type: 
(PDF)
(PDF)Size
139.2 KB
139.2 KB
Page
3
3
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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Good luck to the repair!
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Relevant AUDIO forum topics:
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
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
Sziasztok.
A fenti erősítőben egy ALPS bemenetválasztóban eltört egy fogaskerék. Az Ebayen találtam hozzá fogaskereket, de elvileg itt gyártják Budapesten. Tudnátok segíteni hogy hol csinálnak ilyet, mert én nem találtam sehol.
Köszi előre is. Vinarz János
A fenti erősítőben egy ALPS bemenetválasztóban eltört egy fogaskerék. Az Ebayen találtam hozzá fogaskereket, de elvileg itt gyártják Budapesten. Tudnátok segíteni hogy hol csinálnak ilyet, mert én nem találtam sehol.
Köszi előre is. Vinarz János
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 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!
A fent említett gép sajátom volt, semmi gond nem volt vele, eladtam, pár hónap után visszajött, hogy az egyik fele nem úgy szól!
Nagyot csodálkoztam, de igaza van az ügyfélnek az egyik oldal gyengébb és főként mélyhiányosabb!
Utánaolvastam a tanyán lévő anyagokban, ahol volt egy hasonló eset, mikor a szabályzó modulon kondicsere oldotta meg a dolgot. Az ott említett 1 és4,7 mikrós kondikat kicseréltem, de nem hozott eredményt. Ugyanezen panelen voltak helyettesítő tranzisztorok, azokat is kicseréltem az eredeti BC413B-re, de sajnos a helyzet nem változott. Balance poti és mély poti rendesen szabályoz reccsenés nélkül mindkét oldalon.
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