Service manuals, schematics, eproms for electrical technicians


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Relevant AUDIO forum topics:
Mechanika kenőanyag
Érdeklődnék, hogy ki/milyen kenőanyagot ajánl magnók/CD.játszók felújításához (műanyag fogaskerekek, fém alkatrészek)? Hol lehet ezeket beszerezni? Milyen áron vannak?
Klipsch ProMedia 2.1 Amplified speakers

Original problem is no sub woofer output. Been through this one and recapped it and the common 2 burned 1K (R16/17)
resistors are replaced but the sub is still not responding. Volume control potentiometer is a common issue on these but
the L-R spkrs sound good.

Went by this webpage on the repair:

On the schematic there is a sub-relay (sw101) powered by +V_HF line it
maybe is suppose to be +V_LF ? Without the relay coming on looks like the sub is disconnected.
The zeners (D03/04) that give +/- Vcc to the op amps seemed way off so I replaced them and the voltages seem much closer.

Theres also a sub-mute line on p104 to p101. Power supply shows the LF mute relay and interconnect diagram says it
gets fed from the LF amp. What is triggering the mute? I dont see a mute button anyplace.

Pye type 38H - Cambridge - Radio - Antique - Vintage
Please Upload Schematic, Service manual : Pye type, model 38H Cambridge Valves / Tubes 6: EF39 ECH35 EF39 EBC33 EL33 AZ31 Year: 1948 ? Country: Great Britain (UK) Thank you very much, Ruy
RM-R016 DAB rádió hangerőszabályozás!
Sziasztok ! Adott a fenti rádió melyik M62429 digitális hangerő szabályozása nem működött.A I2C buszon 2V jelet mértem cseréltem gondolván rossz ! A másik ic vel sem működött ! Az adatlap szerint már 0.8 V -t H szintnek érzékel!A processzor mely küldi a buszra jelet 3.3 V ról működik szerintem 3V körüli szinten kéne hogy adjon ! Gondolván egyet külső feszültséggel megemelem a jelelt 5V ról 10 KoHm keresztül a clock- ot megemeltem igy 3 V-let az impulzus szkóppal nézve ami hitelesnek mondható és lás csodát a hangerő szabályozó rendben működik !Várom véleményeteket! Szép napokat!
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