I have a Motorola 520T 8483 Car Radio that I am repairing. I could use a Schimatic and some help. It has two RF Amplifier Transistors (PNP). All the transistors were shot as I suspect someone hooked it up to the wrong polarity or voltage. I have all stages operating, but I cannot get the Local Osc oscillating.
Is the First stage a RF Amp and Osc or is the second state the Osc and mixer?
Thanks, Lyle

:I have a Motorola 520T 8483 Car Radio that I am repairing. I could use a Schimatic and some help. It has two RF Amplifier Transistors (PNP). All the transistors were shot as I suspect someone hooked it up to the wrong polarity or voltage. I have all stages operating, but I cannot get the Local Osc oscillating.
:Is the First stage a RF Amp and Osc or is the second state the Osc and mixer?
:Thanks, Lyle

Lyle,

A schematic for this radio can be found at http://techpreservation.dyndns.org/schematics/63/63_Motorola_520T_78.djvu. The file is in djvu format.

Radiodoc

::I have a Motorola 520T 8483 Car Radio that I am repairing. I could use a Schimatic and some help. It has two RF Amplifier Transistors (PNP). All the transistors were shot as I suspect someone hooked it up to the wrong polarity or voltage. I have all stages operating, but I cannot get the Local Osc oscillating.
::Is the First stage a RF Amp and Osc or is the second state the Osc and mixer?
::Thanks, Lyle
:
:Lyle,
:
:A schematic for this radio can be found at http://techpreservation.dyndns.org/schematics/63/63_Motorola_520T_78.djvu. The file is in djvu format.
:
:Radiodoc
:

::I have a Motorola 520T 8483 Car Radio that I am repairing. I could use a Schimatic and some help. It has two RF Amplifier Transistors (PNP). All the transistors were shot as I suspect someone hooked it up to the wrong polarity or voltage. I have all stages operating, but I cannot get the Local Osc oscillating.
::Is the First stage a RF Amp and Osc or is the second state the Osc and mixer?
::Thanks, Lyle
:
:Lyle,
:
:A schematic for this radio can be found at http://techpreservation.dyndns.org/schematics/63/63_Motorola_520T_78.djvu. The file is in djvu format.
:
:Radiodoc
:
Thanks for the info Radiodoc: Sounds like the site will be good to know about!
Lyle

:I have a Motorola 520T 8483 Car Radio that I am repairing. I could use a Schimatic and some help. It has two RF Amplifier Transistors (PNP). All the transistors were shot as I suspect someone hooked it up to the wrong polarity or voltage. I have all stages operating, but I cannot get the Local Osc oscillating.
:Is the First stage a RF Amp and Osc or is the second state the Osc and mixer?
:Thanks, Lyle Dear Lyle I am Russell I do electronis as a hobby I Lost my best friend Lyle in Oct 2006, he was a Lyle Adamds as well. I was just doing a web search and I found your article. I would like to chat about radios with a Lyle again perhaps we can figure the circuit out. Your name sake was a great man as well an EE engineer Nostolgea Air is too cool! Russell