Service manuals, schematics, eproms for electrical technicians


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BOSS OD-1 OD-2 GUITAR EFFECT PEDAL SCH service manual (1st page)
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  • Please take a look at the below related repair forum topics. May be help you to repair.
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Relevant AUDIO forum topics:
Grundig YB-P 2000 not working on AM bands
Hi All,
Does anyone have any experience of working on this radio, its the small Grundig with a leather case designed by F.A. Porsche.
I have recently repaired one with corroded battery contacts which had obviously not worked for many years.
Its now working perfectly on FM, but MW and SW1 and SW2 have no reception, just noise.
If I leave the radio connected to a 5v power supply for many hours it does actually get some reception on AM, but its not consistent. I'm thinking the fault is somewhere in the 'front end', oscillator stage perhaps.
I have checked the AM coils and wave selector switch are OK and everything is visually in excellent condition. 
Reading various reviews on this radio confirms they were sold very cheaply in the USA and many customers have complained there is little or no sensitivity on AM, whilst others say it works perfectly. This makes me wonder if there is a common fault on these which someone may know, before I start with my test equipment to try to find the problem...

Any advice would be much appreciated!  
Harman/Kardon AVR 2500
Sziasztok! A fenti géphez keresek sm-t. A tanyán lévők közt nem találtam. A barátunk is csak fizetőset mutatott. A masina egyik napról a másikra megkukult, egy szikra zaj sem jön belőle. Köszönöm
EUROMARKT 5.1 házimozi erősítő
Sziasztok! Ennek a gépnek kellene az előlapi proci típusa, ami egy 20 lábú ic, de nem találok rajta semmiféle feliratot, hogy mi is lehet ez. Egy pár perc után erősen melegszik, és a CLK, és a DATA vonalon csak 1,2V mérhető. Ha valaki csinált már ilyet, kérem segítsen!
Sziasztok! Minap kaptam egy JBL- UREI 6290 PA erősítőt , 2x600W rms 4Ohm. Az egyik oldal szétpukkant. Lecserélésre került a végfoksor mind a P-s mind az N-es összes , áramilag megeggyezett a jobb és bal oldal , de kb 10 perc szólás után ugyan úgy szétment. Ekkor lecserélésre került a hajtása is , de ugyan az a helyzet. Van ötletetek erre ? Elég régi technika , de nem hiszem hogy bétára kéne válogatni a végfokokat , de jelenleg tanácstalan vagyok. Szkóppal nézve hibátlan a kimenő szinusz és a nyugalmi áram is sem mászkál.
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