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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SONY MHC-W55 SUPPLEMENT service manual (1st page)
Preview of SONY MHC-W55 SUPPLEMENT [1st page]
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Relevant AUDIO forum topics:
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!
Sony STR DH130 protection mode
Friends Sony STR DH130 goes into protection mode soon after turning on.  It works for a second then can hear loud pops from speakers.
I've tried the suggested methods to fix but nothing works.  Correct impedance speakers.  Speakers wired correct.  Good ventilation.
I've tested the output transistors in circuit and I don't see anything unusual.  I may pull them to test but will wait for advice here.  I also measure
about 57 volts on the emitter resistors.  Seems high to me.  Anyone?
Sony TA-AX44 erősítő reléje nem húz
Hi! Az említett erősítő megadta magát, még a relé sem húz be. Szervízoldalakon láttam a tipikus hibajavítási ötletek között ezt a "relé nem (sem) húz be" problémát, csak sajnos nem férek hozzá. Valakinek esetleg ötlete, tapasztalata? Nagyon köszi!
SONY HCD-RXD7 mini hifi CD játszó és magnódeck gumi szíjak méretei, beszerzési lehetőségei

Több 10 évig elkerültem az ilyen mechanikus szerkezeteket, de most utolért a baráti körből.
Adott címbéli mini hifi, amely sok évi használatlanság miatt sem a CD játszó, sem a 2 kazettás deck nem működik.
Szétszedve mindkét mechanikánál csak megnyúlt, szakadt, több darabba szétesett gumiszíj maradványokat találtam.
Eddigi keresgélésem alapján sehol nem találtam adatokat, milyen szíjak kellenek bele.
Általában méretek alapján lehetne keresgetni, azt is kevés sikerrel.
Ebay-on árulnak 2 -5 db-os kiteket iszonyú árakon.
Kérdésem: tudja-e valaki a szíjak adatait, illetve hol lehetne beszerezni őket emberi áron.
Ideiglenesen próba "befőttes gumival" a CD játszó kifogástalanul működik.
A magnónál az ilyen próba már nem megy.
Előre is köszönet a segítségért.

Üdv: Sándor
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