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PHILCO 80 81 RADIO 1931 SM

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
242.8 KB
Page
5
Category
AUDIO
SERVICE MANUAL
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    PHILCO 80 81 RADIO 1931
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Relevant AUDIO forum topics:
Magnó ékszíjat honnan?
Sziasztok Még utoljára a NEDIS-el voltam heti kapcsolatban de már régóta nem javítok viszont mostanában néha egy egy régi készüléket helyrepofozok magamnak.KItől lehet manapság ékszíjakat nagy választékban rendelni.Minden segítséget megköszönök. Üdv Kiss
Sony Audio CD javítás (Hagyományos chipkészlet)
Sziasztok, nem tudom, vannak-e még hagyományos audio cd lejátszót javító szakemberek itt a fórumon, én mindenesetre úgy látom, hogy manapság reneszánszukat élik a 80-as években gyártott CD audio lejátszók. (nyilván nem véletlenül) Ha igen, akkor szeretnék feltenni egy kérdést. Napokban jutottam hozzá egy SONY CDP-750 lejátszóhoz (a TDA1541 DAC miatt vettem meg) Sajnos ütődésre nagyon érzékeny, egy enyhe kis koccintásra már 10-20 másodperceket ugrik. Szkóppal megnézve a szemábra jelet, egész jónak tűnik. (1 Vp-p) Bár beszereztem egy új KSS-210A fejet, de ezek szerint nem a lézerteljesítmény csökkent le. Mi lehet szerintetek a hiba? (KSS-150a fej, és CXA1081 RF AMP ic-vel) Köszi előre is!
ION Archive LP Turntable

This is a compact design to I guess transfer the vinyl into MP3 format.
Complaint was when the arm was moved the tt dont spin, confirmed that as
theres a leaf switch to sense arm movement,
and its fed to a main pcb with all the IC's that I guess handle all the
stuff. The switch is ok, and I remember seeing 14V or so on the motor pins
frm the PCB, so I figured perhaps theres anough current to spin the motor and
focused on testing the motor.

Manufacturer does not supply the mainboard that feeds the motor but
the motor can be taken apart and after I opened it and
disconnected the small pcb fron the motor terminals and apply power
directly, it spins w 12v. theres a small electrolytic cap on the pcb 25V / 22uF and an
AN6652 4 pin T0-220 type case IC that I guess is some kind of speed control
circuitry.

The drive Motor is an EG-530-SD-3F, main board is stamped K-13007.
Gonna check the cap, but after searching this IC and its
applications with the motor, I see its popular and some drawings show how its used to regulate the 78,33
and 45 rpm speeds.

This drawing looks pretty much what I see in there:
https://tectronelectronics.eu/images/thumbnails/465/465/detailed/31/eg530.jpg
 

I have replaced the IC and the cap, but the motor still does not turn. The main pcb

is proprietary and cant be purchased, and I think it is giving the op-amp IC a reference signal.

Is there a way to bypass that signal or fool the IC to believing its on to test it out?

Photo showing the motor pcb :
http://www.mediafire.com/view/s79blgku1503mtg/HPIM0643.JPG/file
Photo of motor under test:

http://www.mediafire.com/view/thhgvcwac8al7gu/HPIM0635.jpg/file

 

 

 

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Sziasztok! Tudnátok segíteni ebben? Valahol megvolt, de nem találom. Köszi
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