AM/FM Tuner

[amoragustin32]

Sir,


Need your help regarding my Aiwa AM/FM tuner, kasi di maka recieved ng FM signal pero sa AM ok siya.


Thanks

[Ikasamoko]

Baka Japanese? 76-88 mhz lang?

[amoragustin32]

standard tuner ito sir made in japan siya 88 to 108 ang freq nya

[j a y k e z]

baka putol ung antenna

[Ikasamoko]

inject signal sa 10.7...

[Pinoy_Tech]

Sir,


Need your help regarding my Aiwa AM/FM tuner, kasi di maka recieved ng FM signal pero sa AM ok siya.


Thanks

May hissing sound ka bang naririnig, kung meron concentrate ka sa rf, mixer/oscillator stage.
Kung wala, check mo yung if section. Ano bang IF stage na ginamit, ic type or old fashion IFT?
If ic, check datasheet then measure voltages accordingly.

Waiting mode muna 
 

[amoragustin32]

IC type sir pero di ko pa na try lagyan ng speaker kung may hissing siya. wala kasi siyang signal indicator pag fm, pero sa am mayron siyang signal indicator.

[Pinoy_Tech]

Anong ic pala? Baka naman na cut-off lang ang supply. 

[amoragustin32]

Sir ito ang IF IC no. UPC1167C2

[Pinoy_Tech]

Napalitan mo na ba IC? Baka may damage pero check mo muna mga pin supply at switching control ng para sa AM/FM. Pin1 galing front-end, pin2 AM/FM control, pin6 signal out, pin11 supply (no doubt supply is there 'coz AM is working).

Check audio signal from pin6, direct it to any audio amp (use coupling cap). Pag merong audio malamang may problema ka sa mpx stage. Kung walang audio signal, try to disconnect pin5.

http://nice.kaze.com/HA11225.pdf

[bravokilo]

Amora, marami akong napulot mga AM/FM radio using IC's. Google mo at download mo ang datasheet. Andun lahat ang wiring diagram and schematics...trace the uspply line. Inspect the switch to switch AM to FM. Minsan kinalawang and contacts. May sistema na supply and swiching, supply the AM line OR the FM line.

BK

[Min]

TS kung gumamit yan ng ceramic filter, direct replace mo na.

[henyoboi]

ciramic filter lng yan sir tama ung nsa taas ko...

[Ikasamoko]

Tingnan mo yung reply #4 ko sa'yo..