Every time the car goes over a bump, the FM tuning mechanism slips. How can this be tightened so it cannot slip?
Thanks,
Dave
I guess nobody knows. I'll try some things and then give up on it.
Thanks,
Dave
:Hello All,
: Every time the car goes over a bump, the FM tuning mechanism slips. How can this be tightened so it cannot slip?
:
:Thanks,
:
:Dave
I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
(Full tech documentation is enroute.)
73's de Edd
---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------
:Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
:
:I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
:
:You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
I found an article about another T-Bird radio from 1963 that had the same problem. THe solution was given:
http://www.hvra.org/2005-08-gridleak.pdf
The capacitor they found to be in bad condition is the same as C25 as you have pointed out.
Where would I find a replacement capacitor like that?
Thanks,
Dave
:HEEEEEY....Sir David:
:Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
:Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
:
:One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
:Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
:
:Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
:
:Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
:
:To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
:
:Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
:Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
:
:(Full tech documentation is enroute.)
:
:
:
:73's de Edd
:
:---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------
:
::Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
::
::I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
::
::You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
I found an article about another T-Bird radio from 1963 that had the same problem. THe solution was given:
http://www.hvra.org/2005-08-gridleak.pdf
The capacitor they found to be in bad condition is the same as C25 as you have pointed out.
Where would I find a replacement capacitor like that?
Thanks,
Dave
:HEEEEEY....Sir David:
:Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
:Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
:
:One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
:Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
:
:Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
:
:Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
:
:To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
:
:Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
:Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
:
:(Full tech documentation is enroute.)
:
:
:
:73's de Edd
:
:---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------
:
::Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
::
::I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
::
::You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
This unit apppears to be using the type I mentioned and using a full 2 wire wraps upon the brass, rather than the plastic form construction for the dielectric element....but maybe not......you can certainly tell upon inspection..
Ref:
73's de Edd
------------------------------------------------------------------------------------------BT----------------------------------------------------------------------------------------------------
:Edd,
: I found an article about another T-Bird radio from 1963 that had the same problem. THe solution was given:
:http://www.hvra.org/2005-08-gridleak.pdf
:
:The capacitor they found to be in bad condition is the same as C25 as you have pointed out.
:
:Where would I find a replacement capacitor like that?
:
:Thanks,
:
:Dave
:
::HEEEEEY....Sir David:
::Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
::Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
::
::One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
::Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
::
::Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
::
::Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
::
::To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
::
::Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
::Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
::
::(Full tech documentation is enroute.)
::
::
::
::73's de Edd
::
::---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------
::
:::Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
:::
:::I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
:::
:::You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
It looks fine to me. It's just as you have pictured with the wire wrapped around the piece of metal that's wrapped around the outside just in that spot. It doesn't look like brass to me.
Thanks,
Dave
:I'll look in my components stash and see if I can find an appropriate piston cap for you. Is the one in the radio of that plastic form construction or of the porcelain form with an internal screw and plated on / solder coated outer electrode? ...I have never had problems with the latter types in other electronics, other that the screw loosening or having corrosion between it and its metal chassis mount grounding point.
:This unit apppears to be using the type I mentioned and using a full 2 wire wraps upon the brass, rather than the plastic form construction for the dielectric element....but maybe not......you can certainly tell upon inspection..
:Ref:
:
:
:73's de Edd
:
:------------------------------------------------------------------------------------------BT----------------------------------------------------------------------------------------------------
:
:
::Edd,
:: I found an article about another T-Bird radio from 1963 that had the same problem. THe solution was given:
::http://www.hvra.org/2005-08-gridleak.pdf
::
::The capacitor they found to be in bad condition is the same as C25 as you have pointed out.
::
::Where would I find a replacement capacitor like that?
::
::Thanks,
::
::Dave
::
:::HEEEEEY....Sir David:
:::Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
:::Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
:::
:::One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
:::Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
:::
:::Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
:::
:::Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
:::
:::To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
:::
:::Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
:::Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
:::
:::(Full tech documentation is enroute.)
:::
:::
:::
:::73's de Edd
:::
:::---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------
:::
::::Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
::::
::::I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
::::
::::You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
I'm checking this set out again. It seems to slip on both AM and FM. This is a purely mechanical problem. The FM oscillator capacitor works fine. When I tap it it's more critical on the FM band. But if I continue to tap it when it's on AM it can detune as well. Why does it slip and how can I tighten it up so that it stays in place.
Dave
:I'll look in my components stash and see if I can find an appropriate piston cap for you. Is the one in the radio of that plastic form construction or of the porcelain form with an internal screw and plated on / solder coated outer electrode? ...I have never had problems with the latter types in other electronics, other that the screw loosening or having corrosion between it and its metal chassis mount grounding point.
:This unit apppears to be using the type I mentioned and using a full 2 wire wraps upon the brass, rather than the plastic form construction for the dielectric element....but maybe not......you can certainly tell upon inspection..
:Ref:
:
:
:73's de Edd
:
:------------------------------------------------------------------------------------------BT----------------------------------------------------------------------------------------------------
:
:
::Edd,
:: I found an article about another T-Bird radio from 1963 that had the same problem. THe solution was given:
::http://www.hvra.org/2005-08-gridleak.pdf
::
::The capacitor they found to be in bad condition is the same as C25 as you have pointed out.
::
::Where would I find a replacement capacitor like that?
::
::Thanks,
::
::Dave
::
:::HEEEEEY....Sir David:
:::Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
:::Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
:::
:::One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
:::Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
:::
:::Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
:::
:::Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
:::
:::To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
:::
:::Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
:::Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
:::
:::(Full tech documentation is enroute.)
:::
:::
:::
:::73's de Edd
:::
:::---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------
:::
::::Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
::::
::::I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
::::
::::You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
I'm talking about tapping the radio not the capacitor. When the radio is tapped the entire mechanism slips a little bit. I wish I knew how to tighten it up so it cannot slip when subjected to vibration. Maybe the mechanism is not fully engaging with tuning gear after a preset button is pressed? I am not as mechanically inclined as I am electronically inclined. So this has been a major frustration.
Thanks,
Dave
:Edd,
:I'm checking this set out again. It seems to slip on both AM and FM. This is a purely mechanical problem. The FM oscillator capacitor works fine. When I tap it it's more critical on the FM band. But if I continue to tap it when it's on AM it can detune as well. Why does it slip and how can I tighten it up so that it stays in place.
:
:Dave
::I'll look in my components stash and see if I can find an appropriate piston cap for you. Is the one in the radio of that plastic form construction or of the porcelain form with an internal screw and plated on / solder coated outer electrode? ...I have never had problems with the latter types in other electronics, other that the screw loosening or having corrosion between it and its metal chassis mount grounding point.
::This unit apppears to be using the type I mentioned and using a full 2 wire wraps upon the brass, rather than the plastic form construction for the dielectric element....but maybe not......you can certainly tell upon inspection..
::Ref:
::
::
::73's de Edd
::
::------------------------------------------------------------------------------------------BT----------------------------------------------------------------------------------------------------
::
::
:::Edd,
::: I found an article about another T-Bird radio from 1963 that had the same problem. THe solution was given:
:::http://www.hvra.org/2005-08-gridleak.pdf
:::
:::The capacitor they found to be in bad condition is the same as C25 as you have pointed out.
:::
:::Where would I find a replacement capacitor like that?
:::
:::Thanks,
:::
:::Dave
:::
::::HEEEEEY....Sir David:
::::Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
::::Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
::::
::::One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
::::Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
::::
::::Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
::::
::::Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
::::
::::To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
::::
::::Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
::::Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
::::
::::(Full tech documentation is enroute.)
::::
::::
::::
::::73's de Edd
::::
::::---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------
::::
:::::Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
:::::
:::::I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
:::::
:::::You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
I cannot find the service data anymore. Could you please post it again? I have another radio just like this one again. But I'm just trying to figure out which wire is which so I can test it out.
Thanks,
Dave
:HEEEEEY....Sir David:
:Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
:Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
:
:One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
:Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
:
:Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
:
:Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
:
:To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
:
:Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
:Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
:
:(Full tech documentation is enroute.)
:
:
:
:73's de Edd
:
:---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------
:
::Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
::
::I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
::
::You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
I was wrong, I searched and found it. Sorry to bother you. It took me about 12 seconds to figure out which wire was which and the radio works fine. It doesn't have any problems at all, as I thought. The only problem was someone cut 3 of the wires off the speaker connector. But everything is back together now.
Thanks,
Dave
:Edd,
: I cannot find the service data anymore. Could you please post it again? I have another radio just like this one again. But I'm just trying to figure out which wire is which so I can test it out.
:
:Thanks,
:
:Dave
::HEEEEEY....Sir David:
::Am I correct in that unit possibly being for an ~ 66 Tee- 'boid.
::Two thoughts, and confirm, but weren't there only a few pushbuttons divided / shared between the AM-FM selections?
::
::One could consider the mechanical aspect of the pushbuttons and the clutch action of either disengaging from the manual tuning function for a station change via pushbutton..... and then its proper return to the norm of manual tunings mechanical positioning.
::Now it seems possibly that you are of the mind set of that mechanics being involved with causing that "tuning shift".
::
::Have you tried the unit, operating on the bench, and done a rapp-a-tappa to the PCB on the FM osc section area for the possibility of a poor / floating solder or component connection associated with that area. Since, with that effect of "drifting / shifting" off station, that would be the potential other trouble aspect area.
::
::Another possibility might even be the same loose connection type of problem, but associated with the unit loosing its tuning corrective FM AFC action in the same manner...which would produce the same effect.....of jumping off of the station.
::
::To troubleshoot that situation I might suggest going down to the area of the thumbnail schema reference and find R-uhhhh 24...a 470K.... that feeds any DC corrective voltage back from the FM detector derivation source for the X1 varactor diode in the tank sircuit of the FM osc circuit. With that floating, and not simultaneously trying to make correcttion for an osc freq drift...it will further ease the evaluation of the osc ckt when subjected to your self provided "bumps".
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::Lastly...somewhere waaaay in the back of my mind..possibly....I remembered some problems on an OEM suppliers plating job on variable caps provided and the end grief that they were causing down the road in time with intermittencies.
::Possibly of the type of that C 21 that you see fine tuning in the tracking of the LC osc ckt L4-C26-C25. So see if it is mechanically inordinately touchy .....or sub in another.
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::(Full tech documentation is enroute.)
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::73's de Edd
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:::Any bearings, etc., that you can tighten up? If the unit uses a clutch for manual tuning (a unit that also has push-button tuning that would disengage the clutch upon the pushing of a button), you don't want things too tight, or else the clutch may slip. If the unit has permeably tuned coils, don't tighten them up or else they might not move uniformly. Tighten up the tuning linkage instead.
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:::I've never had a radio that moved around on bumps, so I can't imagine why this one is. Must be a very free moving system, or one that moves vertically, and is not well balanced, etc.
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:::You could also try greasing the suspension, but I assume that you've already done that. Greasing between the leaf springs makes a world of difference, if the manufacturer didn't include vinyl pads between the leaves.
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Old tuner grease becomes very stiff and waxy. It also attracts dust and dirt over the decades. A cleaning and a re-lube can work wonders with binding and slipping mechanisms. I have found that most problems of this nature are because of old 'hardened/sticky'grease.
Watch the clutch disengage as a pushbutton is selected and the clutch will re-engage after the pushbutton is released. If it hangs up, there is binding. There should be no need to adjust the clutch, but you can figure that out after the mechanism again moves freely. Kinda like watch repair, only bigger.
WD-40 hurts rubber, Graphite and the new teflon/synthetic lubes are nice and friendly.
Many maufacturers used the same mechanism set up.
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If your issue is mechanical, and it probably is. a 'bump' is helping the spring tension overcome the binding condition.
:Old tuner grease becomes very stiff and waxy. It also attracts dust and dirt over the decades. A cleaning and a re-lube can work wonders with binding and slipping mechanisms. I have found that most problems of this nature are because of old 'hardened/sticky'grease.
: Watch the clutch disengage as a pushbutton is selected and the clutch will re-engage after the pushbutton is released. If it hangs up, there is binding. There should be no need to adjust the clutch, but you can figure that out after the mechanism again moves freely. Kinda like watch repair, only bigger.
: WD-40 hurts rubber, Graphite and the new teflon/synthetic lubes are nice and friendly.
: Many maufacturers used the same mechanism set up.
:
Do you know where I can find the connectors that were in the car? All this radio has is the speaker connector. There is no power connector. The car has bare wires. I am also looking for the Chevy radio schematic mentioned in my other post. I just want to listen to that radio. I'm sure it works fine.
Thanks,
Dave
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:Sir Dave . . . . . .
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:Thank "goooooness" . . that you jes' "refound" it, as my additional :
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:http://img267.imageshack.us/img267/2900/teeboidcaarraaddiiioooij8.jpg
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:Within that looooooong time lag . . .has now become "unhosted".
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:Now I won't have to dig thru old schamatic archives ! Woo-HOO !
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:73's de Edd
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:If your issue is mechanical, and it probably is. a 'bump' is helping the spring tension overcome the binding condition.
::Old tuner grease becomes very stiff and waxy. It also attracts dust and dirt over the decades. A cleaning and a re-lube can work wonders with binding and slipping mechanisms. I have found that most problems of this nature are because of old 'hardened/sticky'grease.
:: Watch the clutch disengage as a pushbutton is selected and the clutch will re-engage after the pushbutton is released. If it hangs up, there is binding. There should be no need to adjust the clutch, but you can figure that out after the mechanism again moves freely. Kinda like watch repair, only bigger.
:: WD-40 hurts rubber, Graphite and the new teflon/synthetic lubes are nice and friendly.
:: Many maufacturers used the same mechanism set up.
::
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