Service manuals, schematics, eproms for electrical technicians

AMPLIFIER UPC1225H 240W 45V.

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    AMPLIFIER UPC-1225H UPC1225H 240W 45V. UPC 1225 240 45 V.
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
CYRUS 1 power amplifier PCB and voltages
The Mission Cyrus 1 service information in the Internet did not include the PCB nor the voltages so far.
It is a bit difficult for you guys to repair it.
I have just repaired one and I took the time to redraw the PCB and measured the voltage to ease your job.

SAL WRC200 car audio amplifier protection is on.
Sziasztok! Valaki tudna segíteni? SAL WRC200 autó erősítő kapcsolási rajzot keresek. Olvastam, ebben a témában volt már fórum de rajzot ott sem találtam. A gondom az, hogy nem indul el a kütyü, védelem nem engedi. TL494-et már cseréltem de szerintem az eredeti se volt rossz. Az IRF feteket jónak mérem a PT35C, PT36C tranyók is jónak látszanak. Volt néhány "kínai" forrasztás amiket kijavítottam, de továbbra sem működik. Az esetleges segíséget előre is köszönöm. Üdv:Laci
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
Nova DXP1400 SMPS Power Amplifier Schematic
Hi,

I am looking for a schematic of Nova DXP1400 SMPS Power Amplifier.
I have one to repair it.
The issue is, that of power off, the loudspeaker output siwtch a flowting voltange to it about 3-5 sec. which is switch between positive and negativ amplitude.

Any sources for it. Nova stops producing/repairing it, so no support at all.

Thank you
Sascha
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