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JVC Victor RC-550 FM Tuner Help

Victor 550 JVC RC-550 FM problem

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#1 nikonfoo

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Posted 15 June 2015 - 12:14 AM

I have a Victor RC-550

AM works fine FM just static

Anyone have any ideas

Is this a problem that is usual on the 550

and could point me to where I should be looking

I feel it must be a common problem as

I just recently decided to buy another one and change over the boards

simple fix :clap:

Got it today

Same problem no Fm just static  :bang:  :bang:

So now I have 2 Victor RC 550's with no FM

Help



#2 Vintage Man

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Posted 19 June 2015 - 10:12 AM

clean the function switch. band select switch. I've had 838 ' s that have not a sound from anything at all. just power on. once I clean every switch. it all comes back. everthing.

#3 nikonfoo

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Posted 21 June 2015 - 08:49 AM

Thanks for the reply vintage man

This was a little different

everything worked except FM

I Fixed one  today it was a bad bad transistor

on the tuner board

will look at the other when i have time

 

:clap:



#4 BoomboxLover48

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Posted 21 June 2015 - 08:53 AM

Thanks for the reply vintage man

This was a little different

everything worked except FM

I Fixed one  today it was a bad bad transistor

on the tuner board

will look at the other when i have time

 

:clap:

HI nikonfoo, Please let us know which transistor was it and identify the location with pictures. This will help our members here if they run into a problem like this. :yes: :-D  



#5 nikonfoo

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Posted 24 June 2015 - 10:56 PM

I would like to first say that someone else with much more knowledge than me told me to look at the transistors

so i fee a little uneasy explaining but hope this can help

First thing I did is surf the net on how to test a transistor

then opened up the box

Attached File  photo 4.JPG   175.24K   5 downloads

There are 6 transistors on the tuner board

Attached File  photo 2.JPG   180.13K   4 downloads

 

the one that I found to be bad is marked here

but I would recommend replacing them all while you have it open

and the iron on

all of the pin's are labeled on the board I think they were all

Base Collector Emitter

Now that you have watched the video you should know how to check them

Put meter on resistor mode

Red on the base should get a reading on C and E

if you dont get a reading its bad

Then black on base and C&E no reading

if you do get a reading its bad

 

then my second the same transistor was bad so i think it may be a good place to start

but maybe it was just a fluke

Attached Files





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