AM/FM radio troubleshooting

[spamtrap1888]

On May 22, 6:41 pm, Meat Plow <mhywa...@yahoo.com> wrote:

Start with the first RF amp. It's probably a superhet so there will be a
455 osc and mixer. After that a couple rf amps and the the detector.

Google a superhetrodyne receiver. This one uses ICs but the basics are the
same

http://www.seekic.com/uploadfile/ic-circuit/20097173226815.gif

Should give you some insight as to where the signal is being lost in the
path.

How do you tune the radio in that schematic?

 

[Phil Allison]

"klem kedidelhopper"


** Lenny,

it would be an act of kindness to simply put a bullet in your head.

I sincerely feel sorry for anyone whose life or well being you are able to
influence - cos it must be life of pure hell for them putting up with a
lunatic like you.

Calling you as six toed, banjo plucking retard was such a masterful piece of
understatement.

Cos all you really are is a piece of fucking garbage.



..... Phil

 

[klem kedidelhopper]

On May 23, 2:10 am, "Phil Allison" <phi...@tpg.com.au> wrote:

"spamtrap1888"



http://www.seekic.com/uploadfile/ic-circuit/20097173226815.gif

How do you tune the radio in that schematic?

** Like any receiver that uses a crystal oscillator.

   By swapping the crystal.

   Ask anyone with a RC model.

.....  Phil

Well we all knew that you were off your rails Phil, but now we know
just what it was that drove you nuts. An intermittent fuse. No TWO
intermittent fuses. Possibly if not the most, then one of the most
simple components known to electronics techs. I sincerely hope they
weren't "chemical" fuses. I guess you must have slept through that
class huh? Maybe that can happen to "2AG" fuses, dunno.....Lenny

 

[Ian Field]

"klem kedidelhopper" <captainvideo462009@gmail.com> wrote in message
news:d68f5a05-8d11-4ebb-bcf3-db0bf24f110e@p23g2000vbl.googlegroups.com...
On May 23, 10:09 am, "Phil Allison" <phi...@tpg.com.au> wrote:

"klem kedidelhopper"

** Lenny,

it would be an act of kindness to simply put a bullet in your head.

I sincerely feel sorry for anyone whose life or well being you are able to
influence - cos it must be life of pure hell for them putting up with a
lunatic like you.

Calling you as six toed, banjo plucking retard was such a masterful piece
of
understatement.

Cos all you really are is a piece of fucking garbage.

.... Phil

So eloquently put Phil! But then I'd expect nothing less from you.


===============================

He was raised by dingoes.

 

[klem kedidelhopper]

On May 23, 10:09 am, "Phil Allison" <phi...@tpg.com.au> wrote:

"klem kedidelhopper"

** Lenny,

it would be an act of kindness to simply put a bullet in your head.

I sincerely feel sorry for anyone whose life or well being you are able to
influence  - cos it must be life of pure hell for them putting up with a
lunatic like you.

Calling you as six toed, banjo plucking retard was such a masterful piece of
understatement.

Cos all you really are is a piece of fucking garbage.

....  Phil

So eloquently put Phil! But then I'd expect nothing less from you.
Lenny

 

[Michael A. Terrell]

Ian Field wrote:

"klem kedidelhopper" <captainvideo462009@gmail.com> wrote in message
news:d68f5a05-8d11-4ebb-bcf3-db0bf24f110e@p23g2000vbl.googlegroups.com...
On May 23, 10:09 am, "Phil Allison" <phi...@tpg.com.au> wrote:
"klem kedidelhopper"

** Lenny,

it would be an act of kindness to simply put a bullet in your head.

I sincerely feel sorry for anyone whose life or well being you are able to
influence - cos it must be life of pure hell for them putting up with a
lunatic like you.

Calling you as six toed, banjo plucking retard was such a masterful piece
of
understatement.

Cos all you really are is a piece of fucking garbage.

.... Phil

So eloquently put Phil! But then I'd expect nothing less from you.

===============================

He was raised by dingoes.

Dingoes that were addicted to heroin.


--
It's easy to think outside the box, when you have a cutting torch.

 

[spamtrap1888]

On May 22, 11:10 pm, "Phil Allison" <phi...@tpg.com.au> wrote:

"spamtrap1888"



http://www.seekic.com/uploadfile/ic-circuit/20097173226815.gif

How do you tune the radio in that schematic?

** Like any receiver that uses a crystal oscillator.

   By swapping the crystal.

   Ask anyone with a RC model.

.....  Phil

So meatplow's proffered schematic is even more spectacularly
inappropriate to the OP's situation -- trouble shooting a nine-
transistor AM-FM radio from 1970. Which, as I recall, likely used a
variable capacitor for tuning.

Googling shows a schematic of the Transistor 305 is available for
purchase on radiomuseum.org

 

[Meat Plow]

On Sun, 22 May 2011 21:53:33 -0700, spamtrap1888 wrote:

On May 22, 6:41 pm, Meat Plow <mhywa...@yahoo.com> wrote:


Start with the first RF amp. It's probably a superhet so there will be
a 455 osc and mixer. After that a couple rf amps and the the detector.

Google a superhetrodyne receiver. This one uses ICs but the basics are
the same

http://www.seekic.com/uploadfile/ic-circuit/20097173226815.gif

Should give you some insight as to where the signal is being lost in
the path.

How do you tune the radio in that schematic

Tune as in select a frequency? Maybe by mind control? It's just a crude
example, not meant to be a service diagram.


--
Live Fast Die Young, Leave A Pretty Corpse

 

[Meat Plow]

On Mon, 23 May 2011 08:00:04 -0700, spamtrap1888 wrote:

On May 22, 11:10 pm, "Phil Allison" <phi...@tpg.com.au> wrote:
"spamtrap1888"



http://www.seekic.com/uploadfile/ic-circuit/20097173226815.gif

How do you tune the radio in that schematic?

** Like any receiver that uses a crystal oscillator.

   By swapping the crystal.

   Ask anyone with a RC model.

.....  Phil

So meatplow's proffered schematic is even more spectacularly
inappropriate to the OP's situation -- trouble shooting a nine-
transistor AM-FM radio from 1970. Which, as I recall, likely used a
variable capacitor for tuning.

Googling shows a schematic of the Transistor 305 is available for
purchase on radiomuseum.org

I'd call it a crude example not a fucking service manual. As I said when
I posted the image link. Here's a more relevant schematic for fuckwits
like you. I apologize but I sometimes forget there are idiots of your ilk
that need to be spoon fed and use a drool cup.

http://transistorhistory.50webs.com/lafay4.gif



--
Live Fast Die Young, Leave A Pretty Corpse

 

[klem kedidelhopper]

On May 23, 11:00 am, spamtrap1888 <spamtrap1...@gmail.com> wrote:

On May 22, 11:10 pm, "Phil Allison" <phi...@tpg.com.au> wrote:

"spamtrap1888"

http://www.seekic.com/uploadfile/ic-circuit/20097173226815.gif

How do you tune the radio in that schematic?

** Like any receiver that uses a crystal oscillator.

   By swapping the crystal.

   Ask anyone with a RC model.

.....  Phil

So meatplow's proffered schematic is even more spectacularly
inappropriate to the OP's situation -- trouble shooting a nine-
transistor AM-FM radio from 1970. Which, as I recall, likely used a
variable capacitor for tuning.

Googling shows a schematic of the Transistor 305 is available for
purchase on radiomuseum.org

I actually have the book with this radio. It has a schematic but comes
up somewhat short when it comes to voltages and waveforms. And the
intermittent nature of the problem makes it so hard to troubleshoot.
The other night it played on my bench for over ten hours. It never
failed and sounded fine. I finally went over and tuned the FM to a few
other stations and they seemed to sound OK. I then switched to AM and
although I did hear some stations, it being late evening I would have
expected to hear much more. But I wasn't sure about this as the shop
is in the basement. I tuned the AM between 550KHZ and 1600KHZ at which
point the radio suddenly quit. The tuning capacitor is not the issue.
And the switches don't appear to be noisy either. The scenario about
tuning the AM and the set quitting seems a bit of a stretch to be a
coincidence but then I just don't know. Anyone have any theories on if
this might be a small clue here? Thanks for following this thread,
Lenny

 

[hrhofmann@att.net]

On May 25, 7:37 am, klem kedidelhopper <captainvideo462...@gmail.com>
wrote:

On May 23, 11:00 am, spamtrap1888 <spamtrap1...@gmail.com> wrote:





On May 22, 11:10 pm, "Phil Allison" <phi...@tpg.com.au> wrote:

"spamtrap1888"

http://www.seekic.com/uploadfile/ic-circuit/20097173226815.gif

How do you tune the radio in that schematic?

** Like any receiver that uses a crystal oscillator.

   By swapping the crystal.

   Ask anyone with a RC model.

.....  Phil

So meatplow's proffered schematic is even more spectacularly
inappropriate to the OP's situation -- trouble shooting a nine-
transistor AM-FM radio from 1970. Which, as I recall, likely used a
variable capacitor for tuning.

Googling shows a schematic of the Transistor 305 is available for
purchase on radiomuseum.org

I actually have the book with this radio. It has a schematic but comes
up somewhat short when it comes to voltages and waveforms. And the
intermittent nature of the problem makes it so hard to troubleshoot.
The other night it played on my bench for over ten hours. It never
failed and sounded fine. I finally went over and tuned the FM to a few
other stations and they seemed to sound OK. I then switched to AM and
although I did hear some stations, it being late evening I would have
expected to hear much more. But I wasn't sure about this as the shop
is in the basement. I tuned the AM between 550KHZ and 1600KHZ at which
point the radio suddenly quit. The tuning capacitor is not the issue.
And the switches don't appear to be noisy either. The scenario about
tuning the AM and the set quitting seems a bit of a stretch to be a
coincidence but then I just don't know. Anyone have any theories on if
this might be a small clue here? Thanks for following this thread,
Lenny- Hide quoted text -

- Show quoted text -

Put a scope on the output of the mixer and keep it there until the
radio dies, and see if that first stage still is working. Do this one
stage at a time until you find which stage is the problem. Have you
tried heating the radio to induce the failure, you don't mention
trying that?