Service manuals, schematics, eproms for electrical technicians

SONY HCD-GNX60 GNX70 GX9900 VER-1.1

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
5.2 MB
Page
76
Category
AUDIO
SERVICE MANUAL
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SONY HCD-GNX60 GNX70 GX9900 VER-1.1 service manual (1st page)
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  • Also known:
    SONY HCDGNX-60 HCDGNX60 GNX70 GX9900 HCDGNX 60 GNX 70 GX 9900 HCD GNX60 1.1 HCD-GNX60
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
Sony TC-K620 random lefagy - Megoldva
Üdv mindenkinek! Keresek bontásból M50941-483SP procit. Egy sony deckben van az alkatrész. Műkődik egy pár percet a készülék, aztán megbolondul, szétesik a kijelzés is és nem reagál semmire. Na jó, ha kihúzom a konnekttorból, arra igen.:D
Sony F110 egyik oldala gyengébb
Szép jó napot mindenkinek segitséget szeretnék kérni egy erösitő javitásában

Van nállam egy Sony F110 erösitő,egyik fele gyengébben,szól a upc1298 ra gyanakszom,a feszültségek a lábain rajz szerint mind rendben vannak,ellenálások értékei is jók.egyik naprol a másikra jött elö ez a hiba.Az összes bemenetelen probáltam
Találkozott már valaki ezzel a fajta hibával?
Üdv András
 
Sony STR-AV 570 rádióerősítő
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repair sony amplifier str-de254
Want to share: Have downloaded the schematics from this forum to help repair the amplifier of a friend. Turned out that Sony decided to route the earth through the chassis, even the earth between the various supplies. When one takes the main board out of the chassis and switches the amp on, there are up to 20 volts difference between the eart (and hence reference) of the pre-amps and the main amps. Luckily the amp goes into protection but from a design point of view it is not nice to rely on screws and aluminum face plates to conduct up to 0.2 amps of current from one supply to another. What I did is solder wires to every eart point and connected them on the main board to make it stand alone and not rely on conducting current through the chassis anymore. Bad design, simple repair but took some digging in the schematics to find out what exactly was going on!
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