2215B - Variable Capacitor Trimmer Locations?

[WBloodworth]

I'm doing an AM/FM alignment on a 2215B and I can find no information in the service manual or anywhere on the internet to indicate how the trimmers are oriented on the variable capacitor.

As you can see here, the service manual refers to these 5 points for adjustment:


And we can see on the schematic that I have circled them in red:


I have "guessed" on this screenshot of the board layout as to the orientation of these adjustment points (highlighted in yellow):

My guesswork is based on this screenshot of the actual board in the same orientation as the board layout above. The AM instructions refer to CA-2 and we can see that the orange wire (from the AM stick antenna) is connected to the second terminal from the bottom. Therefore, I assume the adjustment points are as shown on the image.



Do I have these listed in their correct orientation?

Thank you,

- Wil

 

[rBuckner]

I'll check my folder for that model but here's a way to distinguish AM from FM. The fins on the variable cap are larger and more numerous for AM. The fewer small fins are for FM.

 

[rBuckner]

In my print I labelled them for what they do so you'll need to translate. Your labels will be listed by what my notes say:

CF-3, FM high oscillator (108MHz end)
CF-2, AM high oscillator (1600kHz end)
CF-1, FM high sensitivity
CA-2, AM high sensitivity
CA-1, FM high sensitivity

 

[sregor]

I'll check my folder for that model but here's a way to distinguish AM from FM. The fins on the variable cap are larger and more numerous for AM. The fewer small fins are for FM.

+1 on this. The trimmer caps should be alternating FM and AM. The two nearest the middle of the receiver should be the local oscillators, for FM and AM.
Labels should be:
CF-3
CA-2
CF-2
CA-1
CF-1

Function matches previous post descriptions.

 

[WBloodworth]

Awesome responses. Thank you all!

 

[rBuckner]

Awesome responses. Thank you all!

The bill is in the mail. JK!!