I have tried every adjustment I can think of but it's totally impossible to squish the band back the way it's supposed to go. I can either spread it further out or have this (also spread way out).
Edd, I tried your adjustment but the patient doesn't respond to treatment. There is only one place the trimmer for the oscillator must be set or absolutely zero stations are received. The absolute lowest I can get the low end is 89.9 and at 106 on the dial is 92 Mhz. The tuner absolutely refuses to tune higher. I am about to give up. I don't want to spend years and years on this. I will try the adjustment outlined in the SAMs using a scope and a signal generator and a "VTVM". I'm not sure I have an FM generator though.
What do I do next? What can possibly be wrong? This is extremely frustrating.
Thanks,
Dave
Standing by . . . . |
:Hello All,
: I have tried every adjustment I can think of but it's totally impossible to squish the band back the way it's supposed to go. I can either spread it further out or have this (also spread way out).
: Edd, I tried your adjustment but the patient doesn't respond to treatment. There is only one place the trimmer for the oscillator must be set or absolutely zero stations are received. The absolute lowest I can get the low end is 89.9 and at 106 on the dial is 92 Mhz. The tuner absolutely refuses to tune higher. I am about to give up. I don't want to spend years and years on this. I will try the adjustment outlined in the SAMs using a scope and a signal generator and a "VTVM". I'm not sure I have an FM generator though.
: What do I do next? What can possibly be wrong? This is extremely frustrating.
:
:Thanks,
:
:Dave
:
This is a teeny tiny tuning capacitor, all plastic and sealed. It's in absolutely pristine condition. It is difficult to see when the plates are unmeshed. But I have tried every possible angle in the 360 degree continuous turning trimmer capacitor. There are stations heard only in part of the adjusting. It does have some effect but no matter what I do, it can be set so that the band starts at about 90 or starts past 91. Nothing else. Also, the tuning slug has to be turned all the way into the coil for it to receive any stations at all. Something is not right. Maybe the tiny capacitor across the oscillator trimmer capacitor?
Thanks,
Dave
:
:
:
:
:
:
:
:
:
:
:
:
:Sir David. . . . .
:
:
:Your tuning adjustments and final results are telling us that you are about correct on the present inductance setting of the FM oscillator coil.
:HOWEVER, there is still need of lower capacitance being set with the C13 FM trimmer capacitor.
:
:
:The SAMUELS photo angle of the whole C3 tuning condenser will not permit me to ascertain if it is of
:olde tyme construction, using plates and air dielectric spacing. . . or if of later construction, still using
:small vanes but using very thin HDPE individual insulator sheets between the vanes.
:
:
:In either case, what I think, that in addition to your osc coil getting "diddled" . . . is that the tuning condenser additionally might have gotten Dub-l-ya Dee 40'ed.
:
:
:Hard to visually see, but if there is a thin film of oil in the C13 trimmer condenser, that would be shifting the overall dielectric K factor upwards and the LOWER capacitance which you are now needing, is not attainable.
:
:
:A wash down of the trimmer with multiple micro flushes of denatured alcohol, should rid you of any oil film.
:
:
:The next hardest thing then, is the FULL drying out or pressure blowing out of any alcohol/water residue, in order to get the thing bone dry again for testing.
:
:
:There is also something which the small photo will not reveal to me, if the C13 trimmer is built onto the frame of the C3 tuning condenser and if it has a stop with a fixed / limited range .
:
:
:OR . . . if C13 is one of those CONTINUAL 360 degree rotary adjustments, that you just have to carefully watch where min or max capacitance occurs, before it then starts on a transition after that peak /null.
:
:
:If that cleaning / degreasing doesn't quite totally correct the problem but certainly helps, also consider that the C2 tuning condenser proper might additionally have oil contamination, within it.
:
:
:
:Standing by . . . .
:
:
:BTW is that units clock mechanism with the "flip tab" number halves still working ?
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:
::Hello All,
:: I have tried every adjustment I can think of but it's totally impossible to squish the band back the way it's supposed to go. I can either spread it further out or have this (also spread way out).
:: Edd, I tried your adjustment but the patient doesn't respond to treatment. There is only one place the trimmer for the oscillator must be set or absolutely zero stations are received. The absolute lowest I can get the low end is 89.9 and at 106 on the dial is 92 Mhz. The tuner absolutely refuses to tune higher. I am about to give up. I don't want to spend years and years on this. I will try the adjustment outlined in the SAMs using a scope and a signal generator and a "VTVM". I'm not sure I have an FM generator though.
:: What do I do next? What can possibly be wrong? This is extremely frustrating.
::
::Thanks,
::
::Dave
::
:
O.K. on your confirming that not being the situation on the tuning condenser, particularly with it being the cramped second newer type mentioned, instead of the old air dielectric condenser. |
* * * . . . Unitized Panasonic RC 7254 Schema for Reference: . . . * * *  |
:Edd,
: This is a teeny tiny tuning capacitor, all plastic and sealed. It's in absolutely pristine condition. It is difficult to see when the plates are unmeshed. But I have tried every possible angle in the 360 degree continuous turning trimmer capacitor. There are stations heard only in part of the adjusting. It does have some effect but no matter what I do, it can be set so that the band starts at about 90 or starts past 91. Nothing else. Also, the tuning slug has to be turned all the way into the coil for it to receive any stations at all. Something is not right. Maybe the tiny capacitor across the oscillator trimmer capacitor?
:
:Thanks,
:
:Dave
::
::
::
::
::
::
::
::
::
::
::
::
::Sir David. . . . .
::
::
::Your tuning adjustments and final results are telling us that you are about correct on the present inductance setting of the FM oscillator coil.
::HOWEVER, there is still need of lower capacitance being set with the C13 FM trimmer capacitor.
::
::
::The SAMUELS photo angle of the whole C3 tuning condenser will not permit me to ascertain if it is of
::olde tyme construction, using plates and air dielectric spacing. . . or if of later construction, still using
::small vanes but using very thin HDPE individual insulator sheets between the vanes.
::
::
::In either case, what I think, that in addition to your osc coil getting "diddled" . . . is that the tuning condenser additionally might have gotten Dub-l-ya Dee 40'ed.
::
::
::Hard to visually see, but if there is a thin film of oil in the C13 trimmer condenser, that would be shifting the overall dielectric K factor upwards and the LOWER capacitance which you are now needing, is not attainable.
::
::
::A wash down of the trimmer with multiple micro flushes of denatured alcohol, should rid you of any oil film.
::
::
::The next hardest thing then, is the FULL drying out or pressure blowing out of any alcohol/water residue, in order to get the thing bone dry again for testing.
::
::
::There is also something which the small photo will not reveal to me, if the C13 trimmer is built onto the frame of the C3 tuning condenser and if it has a stop with a fixed / limited range .
::
::
::OR . . . if C13 is one of those CONTINUAL 360 degree rotary adjustments, that you just have to carefully watch where min or max capacitance occurs, before it then starts on a transition after that peak /null.
::
::
::If that cleaning / degreasing doesn't quite totally correct the problem but certainly helps, also consider that the C2 tuning condenser proper might additionally have oil contamination, within it.
::
::
::
::Standing by . . . .
::
::
::BTW is that units clock mechanism with the "flip tab" number halves still working ?
::
::
::
::
::
::73's de Edd
::
::
::
::
::
::
::
::
::
::
:::Hello All,
::: I have tried every adjustment I can think of but it's totally impossible to squish the band back the way it's supposed to go. I can either spread it further out or have this (also spread way out).
::: Edd, I tried your adjustment but the patient doesn't respond to treatment. There is only one place the trimmer for the oscillator must be set or absolutely zero stations are received. The absolute lowest I can get the low end is 89.9 and at 106 on the dial is 92 Mhz. The tuner absolutely refuses to tune higher. I am about to give up. I don't want to spend years and years on this. I will try the adjustment outlined in the SAMs using a scope and a signal generator and a "VTVM". I'm not sure I have an FM generator though.
::: What do I do next? What can possibly be wrong? This is extremely frustrating.
:::
:::Thanks,
:::
:::Dave
:::
::
:
I don't have a Tek 545 or whatever it was anymore. I'll replace the capacitors in the power supply and see if that helps. I don't hear any hum in the sound, and what stations it does receive are crystal clear. But if there's a possibility that replacement of the capacitors will help, I will replace them and let you know if it helped.
Thanks,
Dave
:
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Dave. . . . .
:
:
:
:Maybe the tiny capacitor across the oscillator trimmer capacitor?
:
:
:
:That unit is a temp compensating capacitor and I would tend to give it an IVORY soap rating of probably having a 99.86/100 ths chance of being good !
:
:
:Skeptical ? ? . . . . a standard Ceramic or SM unit should suffice as a temp sub to confirm.
:
:
:
:O.K. on your confirming that not being the situation on the tuning condenser, particularly with it being the cramped second newer type mentioned, instead of the old air dielectric condenser.
:
:
:Consulting the Samuels at the bottom, note that the two FM front end RF circuits are utilizing grounded base circuitry along with them using quite a low supply voltge, by virtue of the great gain cababilities within the IC used in the IF strip.
:
:
:That negated the need for the higher gain in those stages as compared to earlier circuitry using but a few discrete stages of IF amplification, which required more frontal gain.
:
:
:Now since that is quite an old unit, check and see the health of the power supply electrolytics.
:
:
:There is tandem HFAC /RF decoupling, with an electrolytic being shunted with an additional .022 for the RF decoupling aspect.
:
:
:Give particular attention to the C21 470 ufd electrolytic, which is cleaning up the supply voltage, feeding to the FM RF stages.
:
:
:So . . . do a DVM check at those transistors dropping resistors feed boints at R3 and R6 to see that meager voltage is getting through to the transistors.
:
:
:Additionally, go right to those [BLACK SQUARE] 4 and 5 sources in the power supply and kick your metering into AC mode and also be checking for any "trash" on those supply line points.
:
:
:(Since I don't remenber you having a decent scope) . . . no that Eico 460 won't cut it . . . and I do believe that your past workngs with a Tek 545 ? . . . was being a repair/ restore job for someone else.
:
:
:Wouldn't hurt to also do all of the [BLACK SQUARE] power supply's different take off nodes.
:
:
:
:
:ZUJ'ing
:
:
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:* * * . . . Unitized Panasonic RC 7254 Schema for Reference: . . . * * *
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
::Edd,
:: This is a teeny tiny tuning capacitor, all plastic and sealed. It's in absolutely pristine condition. It is difficult to see when the plates are unmeshed. But I have tried every possible angle in the 360 degree continuous turning trimmer capacitor. There are stations heard only in part of the adjusting. It does have some effect but no matter what I do, it can be set so that the band starts at about 90 or starts past 91. Nothing else. Also, the tuning slug has to be turned all the way into the coil for it to receive any stations at all. Something is not right. Maybe the tiny capacitor across the oscillator trimmer capacitor?
::
::Thanks,
::
::Dave
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::Sir David. . . . .
:::
:::
:::Your tuning adjustments and final results are telling us that you are about correct on the present inductance setting of the FM oscillator coil.
:::HOWEVER, there is still need of lower capacitance being set with the C13 FM trimmer capacitor.
:::
:::
:::The SAMUELS photo angle of the whole C3 tuning condenser will not permit me to ascertain if it is of
:::olde tyme construction, using plates and air dielectric spacing. . . or if of later construction, still using
:::small vanes but using very thin HDPE individual insulator sheets between the vanes.
:::
:::
:::In either case, what I think, that in addition to your osc coil getting "diddled" . . . is that the tuning condenser additionally might have gotten Dub-l-ya Dee 40'ed.
:::
:::
:::Hard to visually see, but if there is a thin film of oil in the C13 trimmer condenser, that would be shifting the overall dielectric K factor upwards and the LOWER capacitance which you are now needing, is not attainable.
:::
:::
:::A wash down of the trimmer with multiple micro flushes of denatured alcohol, should rid you of any oil film.
:::
:::
:::The next hardest thing then, is the FULL drying out or pressure blowing out of any alcohol/water residue, in order to get the thing bone dry again for testing.
:::
:::
:::There is also something which the small photo will not reveal to me, if the C13 trimmer is built onto the frame of the C3 tuning condenser and if it has a stop with a fixed / limited range .
:::
:::
:::OR . . . if C13 is one of those CONTINUAL 360 degree rotary adjustments, that you just have to carefully watch where min or max capacitance occurs, before it then starts on a transition after that peak /null.
:::
:::
:::If that cleaning / degreasing doesn't quite totally correct the problem but certainly helps, also consider that the C2 tuning condenser proper might additionally have oil contamination, within it.
:::
:::
:::
:::Standing by . . . .
:::
:::
:::BTW is that units clock mechanism with the "flip tab" number halves still working ?
:::
:::
:::
:::
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
::::Hello All,
:::: I have tried every adjustment I can think of but it's totally impossible to squish the band back the way it's supposed to go. I can either spread it further out or have this (also spread way out).
:::: Edd, I tried your adjustment but the patient doesn't respond to treatment. There is only one place the trimmer for the oscillator must be set or absolutely zero stations are received. The absolute lowest I can get the low end is 89.9 and at 106 on the dial is 92 Mhz. The tuner absolutely refuses to tune higher. I am about to give up. I don't want to spend years and years on this. I will try the adjustment outlined in the SAMs using a scope and a signal generator and a "VTVM". I'm not sure I have an FM generator though.
:::: What do I do next? What can possibly be wrong? This is extremely frustrating.
::::
::::Thanks,
::::
::::Dave
::::
:::
::
:
Sir Dave:
Check the mentioned voltages initially and then check that first electrolytic capacitor C21 that I referred to as feeding those FM RF sections.
de Edd
:Edd,
: I don't have a Tek 545 or whatever it was anymore. I'll replace the capacitors in the power supply and see if that helps. I don't hear any hum in the sound, and what stations it does receive are crystal clear. But if there's a possibility that replacement of the capacitors will help, I will replace them and let you know if it helped.
:
:Thanks,
:
:Dave
::
::
::
::
::
::
::
::
::
::
::
::
::
::Sir Dave. . . . .
::
::
::
::Maybe the tiny capacitor across the oscillator trimmer capacitor?
::
::
::
::That unit is a temp compensating capacitor and I would tend to give it an IVORY soap rating of probably having a 99.86/100 ths chance of being good !
::
::
::Skeptical ? ? . . . . a standard Ceramic or SM unit should suffice as a temp sub to confirm.
::
::
::
::O.K. on your confirming that not being the situation on the tuning condenser, particularly with it being the cramped second newer type mentioned, instead of the old air dielectric condenser.
::
::
::Consulting the Samuels at the bottom, note that the two FM front end RF circuits are utilizing grounded base circuitry along with them using quite a low supply voltge, by virtue of the great gain cababilities within the IC used in the IF strip.
::
::
::That negated the need for the higher gain in those stages as compared to earlier circuitry using but a few discrete stages of IF amplification, which required more frontal gain.
::
::
::Now since that is quite an old unit, check and see the health of the power supply electrolytics.
::
::
::There is tandem HFAC /RF decoupling, with an electrolytic being shunted with an additional .022 for the RF decoupling aspect.
::
::
::Give particular attention to the C21 470 ufd electrolytic, which is cleaning up the supply voltage, feeding to the FM RF stages.
::
::
::So . . . do a DVM check at those transistors dropping resistors feed boints at R3 and R6 to see that meager voltage is getting through to the transistors.
::
::
::Additionally, go right to those [BLACK SQUARE] 4 and 5 sources in the power supply and kick your metering into AC mode and also be checking for any "trash" on those supply line points.
::
::
::(Since I don't remenber you having a decent scope) . . . no that Eico 460 won't cut it . . . and I do believe that your past workngs with a Tek 545 ? . . . was being a repair/ restore job for someone else.
::
::
::Wouldn't hurt to also do all of the [BLACK SQUARE] power supply's different take off nodes.
::
::
::
::
::ZUJ'ing
::
::
::
::
::73's de Edd
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::* * * . . . Unitized Panasonic RC 7254 Schema for Reference: . . . * * *
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
:::Edd,
::: This is a teeny tiny tuning capacitor, all plastic and sealed. It's in absolutely pristine condition. It is difficult to see when the plates are unmeshed. But I have tried every possible angle in the 360 degree continuous turning trimmer capacitor. There are stations heard only in part of the adjusting. It does have some effect but no matter what I do, it can be set so that the band starts at about 90 or starts past 91. Nothing else. Also, the tuning slug has to be turned all the way into the coil for it to receive any stations at all. Something is not right. Maybe the tiny capacitor across the oscillator trimmer capacitor?
:::
:::Thanks,
:::
:::Dave
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::Sir David. . . . .
::::
::::
::::Your tuning adjustments and final results are telling us that you are about correct on the present inductance setting of the FM oscillator coil.
::::HOWEVER, there is still need of lower capacitance being set with the C13 FM trimmer capacitor.
::::
::::
::::The SAMUELS photo angle of the whole C3 tuning condenser will not permit me to ascertain if it is of
::::olde tyme construction, using plates and air dielectric spacing. . . or if of later construction, still using
::::small vanes but using very thin HDPE individual insulator sheets between the vanes.
::::
::::
::::In either case, what I think, that in addition to your osc coil getting "diddled" . . . is that the tuning condenser additionally might have gotten Dub-l-ya Dee 40'ed.
::::
::::
::::Hard to visually see, but if there is a thin film of oil in the C13 trimmer condenser, that would be shifting the overall dielectric K factor upwards and the LOWER capacitance which you are now needing, is not attainable.
::::
::::
::::A wash down of the trimmer with multiple micro flushes of denatured alcohol, should rid you of any oil film.
::::
::::
::::The next hardest thing then, is the FULL drying out or pressure blowing out of any alcohol/water residue, in order to get the thing bone dry again for testing.
::::
::::
::::There is also something which the small photo will not reveal to me, if the C13 trimmer is built onto the frame of the C3 tuning condenser and if it has a stop with a fixed / limited range .
::::
::::
::::OR . . . if C13 is one of those CONTINUAL 360 degree rotary adjustments, that you just have to carefully watch where min or max capacitance occurs, before it then starts on a transition after that peak /null.
::::
::::
::::If that cleaning / degreasing doesn't quite totally correct the problem but certainly helps, also consider that the C2 tuning condenser proper might additionally have oil contamination, within it.
::::
::::
::::
::::Standing by . . . .
::::
::::
::::BTW is that units clock mechanism with the "flip tab" number halves still working ?
::::
::::
::::
::::
::::
::::73's de Edd
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
:::::Hello All,
::::: I have tried every adjustment I can think of but it's totally impossible to squish the band back the way it's supposed to go. I can either spread it further out or have this (also spread way out).
::::: Edd, I tried your adjustment but the patient doesn't respond to treatment. There is only one place the trimmer for the oscillator must be set or absolutely zero stations are received. The absolute lowest I can get the low end is 89.9 and at 106 on the dial is 92 Mhz. The tuner absolutely refuses to tune higher. I am about to give up. I don't want to spend years and years on this. I will try the adjustment outlined in the SAMs using a scope and a signal generator and a "VTVM". I'm not sure I have an FM generator though.
::::: What do I do next? What can possibly be wrong? This is extremely frustrating.
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::
:::
::
:
I'll replace that one too. That's the discriminator's "filter" capacitor.
Thanks,
Dave
:
:Sir Dave:
:
:
:Check the mentioned voltages initially and then check that first electrolytic capacitor C21 that I referred to as feeding those FM RF sections.
:
:
:
:de Edd
:
:
::Edd,
:: I don't have a Tek 545 or whatever it was anymore. I'll replace the capacitors in the power supply and see if that helps. I don't hear any hum in the sound, and what stations it does receive are crystal clear. But if there's a possibility that replacement of the capacitors will help, I will replace them and let you know if it helped.
::
::Thanks,
::
::Dave
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::Sir Dave. . . . .
:::
:::
:::
:::Maybe the tiny capacitor across the oscillator trimmer capacitor?
:::
:::
:::
:::That unit is a temp compensating capacitor and I would tend to give it an IVORY soap rating of probably having a 99.86/100 ths chance of being good !
:::
:::
:::Skeptical ? ? . . . . a standard Ceramic or SM unit should suffice as a temp sub to confirm.
:::
:::
:::
:::O.K. on your confirming that not being the situation on the tuning condenser, particularly with it being the cramped second newer type mentioned, instead of the old air dielectric condenser.
:::
:::
:::Consulting the Samuels at the bottom, note that the two FM front end RF circuits are utilizing grounded base circuitry along with them using quite a low supply voltge, by virtue of the great gain cababilities within the IC used in the IF strip.
:::
:::
:::That negated the need for the higher gain in those stages as compared to earlier circuitry using but a few discrete stages of IF amplification, which required more frontal gain.
:::
:::
:::Now since that is quite an old unit, check and see the health of the power supply electrolytics.
:::
:::
:::There is tandem HFAC /RF decoupling, with an electrolytic being shunted with an additional .022 for the RF decoupling aspect.
:::
:::
:::Give particular attention to the C21 470 ufd electrolytic, which is cleaning up the supply voltage, feeding to the FM RF stages.
:::
:::
:::So . . . do a DVM check at those transistors dropping resistors feed boints at R3 and R6 to see that meager voltage is getting through to the transistors.
:::
:::
:::Additionally, go right to those [BLACK SQUARE] 4 and 5 sources in the power supply and kick your metering into AC mode and also be checking for any "trash" on those supply line points.
:::
:::
:::(Since I don't remenber you having a decent scope) . . . no that Eico 460 won't cut it . . . and I do believe that your past workngs with a Tek 545 ? . . . was being a repair/ restore job for someone else.
:::
:::
:::Wouldn't hurt to also do all of the [BLACK SQUARE] power supply's different take off nodes.
:::
:::
:::
:::
:::ZUJ'ing
:::
:::
:::
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::* * * . . . Unitized Panasonic RC 7254 Schema for Reference: . . . * * *
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
::::Edd,
:::: This is a teeny tiny tuning capacitor, all plastic and sealed. It's in absolutely pristine condition. It is difficult to see when the plates are unmeshed. But I have tried every possible angle in the 360 degree continuous turning trimmer capacitor. There are stations heard only in part of the adjusting. It does have some effect but no matter what I do, it can be set so that the band starts at about 90 or starts past 91. Nothing else. Also, the tuning slug has to be turned all the way into the coil for it to receive any stations at all. Something is not right. Maybe the tiny capacitor across the oscillator trimmer capacitor?
::::
::::Thanks,
::::
::::Dave
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::Sir David. . . . .
:::::
:::::
:::::Your tuning adjustments and final results are telling us that you are about correct on the present inductance setting of the FM oscillator coil.
:::::HOWEVER, there is still need of lower capacitance being set with the C13 FM trimmer capacitor.
:::::
:::::
:::::The SAMUELS photo angle of the whole C3 tuning condenser will not permit me to ascertain if it is of
:::::olde tyme construction, using plates and air dielectric spacing. . . or if of later construction, still using
:::::small vanes but using very thin HDPE individual insulator sheets between the vanes.
:::::
:::::
:::::In either case, what I think, that in addition to your osc coil getting "diddled" . . . is that the tuning condenser additionally might have gotten Dub-l-ya Dee 40'ed.
:::::
:::::
:::::Hard to visually see, but if there is a thin film of oil in the C13 trimmer condenser, that would be shifting the overall dielectric K factor upwards and the LOWER capacitance which you are now needing, is not attainable.
:::::
:::::
:::::A wash down of the trimmer with multiple micro flushes of denatured alcohol, should rid you of any oil film.
:::::
:::::
:::::The next hardest thing then, is the FULL drying out or pressure blowing out of any alcohol/water residue, in order to get the thing bone dry again for testing.
:::::
:::::
:::::There is also something which the small photo will not reveal to me, if the C13 trimmer is built onto the frame of the C3 tuning condenser and if it has a stop with a fixed / limited range .
:::::
:::::
:::::OR . . . if C13 is one of those CONTINUAL 360 degree rotary adjustments, that you just have to carefully watch where min or max capacitance occurs, before it then starts on a transition after that peak /null.
:::::
:::::
:::::If that cleaning / degreasing doesn't quite totally correct the problem but certainly helps, also consider that the C2 tuning condenser proper might additionally have oil contamination, within it.
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:::::Standing by . . . .
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:::::BTW is that units clock mechanism with the "flip tab" number halves still working ?
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:::::73's de Edd
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::::::Hello All,
:::::: I have tried every adjustment I can think of but it's totally impossible to squish the band back the way it's supposed to go. I can either spread it further out or have this (also spread way out).
:::::: Edd, I tried your adjustment but the patient doesn't respond to treatment. There is only one place the trimmer for the oscillator must be set or absolutely zero stations are received. The absolute lowest I can get the low end is 89.9 and at 106 on the dial is 92 Mhz. The tuner absolutely refuses to tune higher. I am about to give up. I don't want to spend years and years on this. I will try the adjustment outlined in the SAMs using a scope and a signal generator and a "VTVM". I'm not sure I have an FM generator though.
:::::: What do I do next? What can possibly be wrong? This is extremely frustrating.
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::::::Thanks,
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::::::Dave
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