Service manuals, schematics, eproms for electrical technicians

HEATHKIT A7-E SCH

AUDIO - SERVICE MANUAL
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Category
AUDIO
SERVICE MANUAL
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  • Also known:
    HEATHKIT A-7E A7E A7 A7-E
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Relevant AUDIO forum topics:
Receiver Denon AVR1311 starts On and after 8 seconds shut down automatically...
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?
Incomplete caraudio service manual
Hi, i'm new, from Italy, sorry but i do not know hungarian :-) i found on your site the Sony XR-C650RDS service manual, but it is not complete. Your manual missing the pages from 31 to 48 with the electronic diagram do you have a complete diagram, i do not found it on internet Thanks
American Audio CK-1000 Balanced kimenet néma
Szervusztok!
A fenti discós CD-lejátszót azzal hozták be, hogy "begerjedt", aztán nem működött a kimenet (balanced). Szétszedve az alsó fém borítón fél tenyérnyi korom, a a panelen felrobbant tranzisztor, elégett fólia, SMD ell-k. Erősen kétlem, hogy csak "begerjedt", szerintem valami nagy feszültség került rá valahogyan. Maga a CD lejátszó (mindkettő) kifogástalanul működik. A szemmel látható, és hidegen mérhető alkatrészeket kicseréltem, de most már rajz kellene hozzá. ha valakinek volna, megköszönném. A SM keresőbe is föltettem, de a sok kidobott rajz egyike sem illett hozzá. Ha esetleg tudna valaki segíteni, azt megköszönném.  Képek mellékelve.
Üdvözlettel:
Attila
Technics SU-VX620 és/vagy SU-VX720 MOS Class AA
Halihó Van valakinek valamilyen tapasztalata az alábbi erősítőkkel kapcsolatban? Gondolok hangzás, dinamika, zenei élmény, zajszint, megbízhatóság, teljesítmény, érdemes-e megvenni, stb. Bármilyen információ jöhet. Előre is köszönöm. Karcsi
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