Looking for a 1968 Mopar car radio schematic

[Stereo2]

Hi all.
I am looking for a 1968 Plymouth Bendix Mark 1 (284 890)
ser. 9FBBA AM/FM car radio schematic.
Basicly the AM is not working, FM works but not 100% & it also has a split plastic tuning gear. Any Help would be much appreciated.

[compu_85]

I bet drh4683 can help with this.

[Stereo2]

Maybe these photo's may help.

I did unsoldered one pin on one of the resistor/capacitor networks which it brought back the FM to a 100% working condition. You may see the unsoldered pin in PCT0010a.

[Stereo2]

Some more photo's

[peverett]

Check the Howard W. Sams website. Sams has an auto radio series of schematics. Of course, Sams does charge for these.

[Stereo2]

Thanks Peverett. E-mail sent.

I would appreciate any other Tech tips.

I did reversed two transistors (dia. A ) with no change to AM or FM. I was hoping if it was a bad oscilator transistor it would show some kind of change.( I.F. would be poor but AM oscilator would tune in?)

There is a diode ( dia. B ) that I pulled & it measures like a diode, but I can not identify. (Zener?) Which lead me to unsoldering Cap/resistor network pin, in turn makes the FM work perfectly.

[peverett]

On the Howard W. Sams website, you can enter the radio model number and see if they have the schematic.

[Stereo2]

I started removing I.F. coils & inspecting the winding in the coils. On the third I.F. coil removed, I found one of the windings corroded, but fixable!

Fixed without any schematics. AM & FM are working!

Now I'll try to fix the broken plastic gear. Any suggestions?

[Reece]

If the gear is otherwise whole, you could superglue it with the proper one for plastics. I used it on a plastic gear in a tape player successfully. If there's room on the side of the gear, sand lightly and superglue thin aluminum "band aids" across the crack.