Service manuals, schematics, eproms for electrical technicians


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If you get stuck in repairing a defective appliance download this repair information for help. See below.
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THE HARMAN KARDON HD7300 service manual (1st page)
Preview of THE HARMAN KARDON HD7300 [1st page]
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THE HARMAN KARDON HD7300 service manual (2nd page)
Preview of THE HARMAN KARDON HD7300 [2nd page]
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  • Also known:
    THE HARMAN KARDON HD-7300 HD7300 HD 7300
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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:
Trio-Kenwood: KR-3010 [Radio] S.N.962845 / Does not work, the final floor and prefinal floor defect with many burned component/

I greet you! I would need the scheme of this "vintage" amplifier that needs to be "restored". The problem is that in the prefinal and final floor I have many "fried" resistors well, their value cannot be identified.I replaced the defective transistors: 2SC1509, 2SA777,2SB690 and 2SD 796 (each 2 pcs.) and the electrolytic capacitors adjacent to them. I could not go further because of the carbonized resistors that I do not know their value (I can only guess that they are values small, in the order of ohms). The schematic diagram I downloaded, from the address received by the kindness of a colleague is not complete - it is a single page (missing Q29-Q30-Q31-Q3 and resistors R115-R116-R117-R118 which are completely carbonized, at other resistors I could see their value).Thanks in advance!
Finally, I found the missing part

If stuck in the repair and you ask questions, please do it as follows: - Details: Give the exact model number of your device and the chassis ID (if there is). - If possible, please attach pictures of the appliance. - Anamnesis: Write down the exact symptom. If hard to describe the symptom, it is difficult to verbally defined clearly, attach pictures or sound of the phenomenon! - Tell what was you have done so far: search contact error, which parts has examined or changed yet, etc... The incorrectly named topic suspended and will be deleted after 48 hours! Suspended state while others are not able to comment until you correct the address. Subsequent repair of the defective title (within 48 hours) by clicking on the "Edit" tab can be carried out.

Aiwa RX-30 -ban a 3SK73 helyettesíthető-e BF964-el? És hangolási hiba.
Sziasztok! Egy Aiwa RX-30-at javítok, tuner-hibás. A 3sk73-ra terelődött a gyanú. Az volna a kérdésem, mivel semmit nem találtam róla, hogy helyettesíthető-e pl. BF964, vagy BF966-al? Persze, megfelelő lábelrendezés után. Köszönettel Attila
I tried to change the accuphase T-1000

I tried to change the accuphase T-1000 from 76-90mhz to 87.5-108mhz. Now it shows that it is already 87.5-108mhz, but I still cannot find the circuit diagram of AD9850 + UPC3220
Poweramp. Kb.100erősitő kapcs rajz letőlthetö.
Sziasztok . Gondoltam megosztom veletek ezt a kapcsolás gyűjteményt. Sok sok zenekari és hifi erősítő rajza megtalálható. mérete miatt nem tudtam feltölteni a tanyára. üdv:hifi64
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