Service manuals, schematics, eproms for electrical technicians
DENON PMA-50 VER.1
Type: 
(PDF)
(PDF)Size
10.3 MB
10.3 MB
Page
92
92
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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- Also known:
DENON PMA-50 PMA50 PMA 50
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Relevant AUDIO forum topics:
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
Tisztelt kollégák!
Fent említett Denon AVR2802 erősítő DSP board memó IC írásában kérek segítséget. Pár év pihenő után elővettem még egy esélyt adva neki. :-)
Fórumozva rátaláltam a memó IC fw programjára. (Már tudom ennek a típusnak ez is a típushibája.)
TL866 II-el írható. (Természetesen kell a TSOP32-es tok is) Ezeket csak ezért nem szeretném megvenni.
FW ahogy írtam meg van (fórumozók visszajelzése alapján többeknél írás után meg is javult az erősítő azaz a "megszerzett" fw jó.)
IC is már van ALIE-ről beszereztem. :-)
Mellékletben a SM részlete erről. IC817-es.
Ha valaki tud ebben segíteni hálás lennék.
Üdvözlettel: Cser Lajos
Fent említett Denon AVR2802 erősítő DSP board memó IC írásában kérek segítséget. Pár év pihenő után elővettem még egy esélyt adva neki. :-)
Fórumozva rátaláltam a memó IC fw programjára. (Már tudom ennek a típusnak ez is a típushibája.)
TL866 II-el írható. (Természetesen kell a TSOP32-es tok is) Ezeket csak ezért nem szeretném megvenni.
FW ahogy írtam meg van (fórumozók visszajelzése alapján többeknél írás után meg is javult az erősítő azaz a "megszerzett" fw jó.)
IC is már van ALIE-ről beszereztem. :-)
Mellékletben a SM részlete erről. IC817-es.
Ha valaki tud ebben segíteni hálás lennék.
Üdvözlettel: Cser Lajos
Sziasztok!
Nem hiszem el, hogy minden be...... :(
Egyszer csak kikapcsolta magát, normál hangerőn volt, semmi túlterhelés.
Most ez is kuka? :(
Készenlét van de semmi más, kijelzés meg semmi nincs :(
Köszi!
Üdv:
Pityesz
Hello everybody,
This receiver starts normally and has a nice blue display lighting on for 8 seconds. Suddenly you ear the main relay falling down and everything turns off and you get the red led flashing around the main power switch button. There is no special code with this continuous flashing rythm of the led. I have no diagram of the device and I have opened it and measured the voltage on pin 4 of the voltage regulator KIA78R05P1, which has a validating signal on his pin four.(2 is the output and 3 is frame (-)).this 5V(to-220)monolithic 7805 regulator is on the main PCB, close to the little transfo and ON/OFF relay...and is mounted without any heat dissipator(I was surprised of that fact!).the voltage between(4-3)is 1,88V dc and never climbs up during the starting sequence.
Can you help me to solve this problem?
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