Service manuals, schematics, eproms for electrical technicians

ROMANTIK OROSZ RADIO SCH.

AUDIO - SERVICE MANUAL
Type: (DJVU)
Size
18.7 KB
Page
1
Category
AUDIO
SERVICE MANUAL
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    ROMANTIK OROSZ RADIO SCH.
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Relevant AUDIO forum topics:
Thomson Altima 3800 Center magnó része hibás.
Üdv Mesterek! A fent említett gép mindkét kazetta része hibás. Rajz a Tanyáról megvan. Viszont talán a vakságom az oka , de a rajzon nem találom a magnó részben lévő 1-1 fotodiódát. Minkét rész kettős diódának szakadt a fénykibocsátó része, fény érzékelő része jó. Magán a diódán sincs semmi feltüntetve.Talán 3x2mm lehet és 4 kivezetése van. Fotóaparátom megállt. Ismeri valaki ezt a masinát , vagy a diódát? Valami hasonló kettős dióda beszerezhető? Mi a pontos megnevezése. Előre köszönve a segítséget. Öreg T.
Request for Firmware or Help – Kenwood M-9000 SS stuck on "Waiting for PC Wizard"

Hello,

I recently purchased a used Kenwood M-9000 SS micro Hi-Fi system, but unfortunately, the unit is not functioning correctly. When I power it on, the display is stuck on the message "Waiting for PC Wizard", and the device becomes completely unresponsive – it does not react to any buttons or remote control inputs.

From my research, it seems that this issue may be caused by a missing or corrupted firmware, particularly related to the Sunplus SPHE8202 chipset used inside the device.

I have been trying to locate the correct firmware file (possibly DVDROM.BIN) that matches the hardware (the board ID may be BD305890BB9B50), but so far, I have had no luck finding a working download source.

Could someone please help me with:

  • The correct firmware file for this model

  • Instructions or guidance on how to recover the system using a USB flash drive

  • Any experience with solving this "Waiting for PC Wizard" message on similar Sunplus-based systems

Any help or direction would be greatly appreciated!

Thank you in advance.

Best regards,
Dejan Todorović

Dynacord Powermate 1000-2 mixer amp fault - Help needed

Hiya
I am repairing a Dynacord Powermate 1000-2 mixer/amp and have a question about DC blocking capacitors in the signal path.

 

I am getting a slowly dropping DC on the DISP1 node (output of I6AA op-amp) on switch-on.  This is causing the green "signal present" LED to come on on that channel which takes about 30 seconds to turn off.  It seems to be caused by a charge on C35A that dissipates slowly through R54A (1M Ohm).  

 

It seems to me, it would have been better to put the C35A on the output of I5AA with a resistor to ground.  Is there a reason why this would not work.  

 

I have checked all relevant components and power supplies and I cannot find any faults but I'm sure this is not normal behaviour.

 

Any help greatly appreciated.

PM1000 tone circuit

signal indicator

 

 

 

SAL SAF 3070
Sziasztok. SAL SAF 3070 ERŐSÍTŐM LEDJE PIROSSAN VILÁGÍT. Utánna PIROSSAN villog. Égést nem látok rajt. Ki kapcsoltam. Utánna ezt a hibát produkálja. Valamiért letiltott a védelem. Valaki találkozott már ezzel a hibával? Holnap végig mérek rajt mindent. Előre is köszönöm a segítséget. 
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