AIWA CDC-X447M X507M SM.
(DJVU)1.1 MB
32
CAR-AUDIO
SERVICE MANUAL
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AIWA CDCX-447M X-507M SM. CDCX447M X507M CDCX 447 507 CDC X447M CDC-X447M
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This radio is to a 1970's MG/MGB vehicle. Its using an older 14 Pin DIP IC to
do the FM stuff, its marked T2D. Cross ref comes to a NTE723.
If I put my metal probe on pin 9 or 10 (detector) I can hear a local FM station playing,
but the tuning has no effect.
I have 100 ohms from pin 9 or 10 to gnd. Pin 3 is seen directly tied to gnd, and pin 4 also reads short to gnd
and there is no DC volts on it also no dc volts on pin 5. I can see no dc volts on any pin I probe. Is the IC bad?
Its not getting warm for short and current draw on the PS is minimal.
Sziasztok!
Autórádió mikrofonbemenet, üresjáratban 8V, 1k-val terhelve 4,5V mérhető rajta. Sima elektret mikrofon szól róla, de nagyon halkan, vonalszintű jelről már jó. Hogy lehet erősíteni a mikrofon jelét, hogy ne kelljen külön táp neki?
Jácint
Egy Vw autórádió végfokok szeretnék cserélni mert zárlatos lett. A felirat rajta 16219796. Ez kiváltható Tda7384-el?
Köszönöm Balázs
Lenne egy ilyen ketyere:
https://www.emag.hu/gladen-audio-us-08-autohifi-aktiv-subwoofer-ules-ala-ga-us08/pd/DW9R2VBBM/
Kb. mint egy erősebb zsebrádió, úgy szól.
Két TDA7396 van benne. 12V mennek. A kimeneteken üresben pár 10mV mérek.
Az op amp-ok 4558-ak, amik 7810-ról tápláltak.
Ha hajtom labortápról, kb. 2 ampert ha felvesz csúcsban.
Mi lehet a nyűgje?
Köszi
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