Sony PS-F9 turntable. Disconnected component don't know where it goes?

[Hippos]

I am not an electronic expert in any way. I usually just repair, or try hard to repair what I have because absolutely no one is technically qualified where I live, Sadly..

Sony PS-F9 turntable, the Japanese Version, which I can't seem to find a service manual for. The one I could find everywhere is the manual for the Canadian version.

The difference is that the jap version has an FM transmitter which was working great until I decided to replace the back-cover screws because their Philips head seems a bit corroded. Anyway, I replaced them, but being dumb enough, I forgot which one goes where and there are difference sizes lengths for the screws so I just lifted the backcover to check where the tall ones and short ones go and put it back..

While doing so, I probably knocked out a leg of a component that was soldered to the board. That component, after searching looked like this
(googling, it seem like a choke)



The turntable still works, but no longer FM transmits.
Is that loose leg, probably, the reason why the FM thing stopped working?
Here are the actual photos from inside the device

It's the green component from under the board with 2 insulated with a clear insulation wires. One is already attached at the board from up there the other is loose.




I can't seem to find a place on the board that shows a sign of a disconnected component.

Service manual of the canadian version <<<<

So the FM transmitter only works with a DC power supply, when using battery it does not work. That is how it is designed not a flaw. Now it doesn't work on either. Normally, it starts transmitting once the device is connected to a power supply and even if the device is turned off (on/off button is set to off) it still transmits an empty silent transmission.

I would appreciate if someone can help me of where to solder the loose leg and I am ready to open the back cover any time to give you more photos or any info you need. I just fear to go under the board. Highly sensitive wire connections that give me a huge fear..

 

[ramussons]

That is a RF choke, and in all probability, in the FM transmitter power feed. It may not be on the PCB, but mounted around the AC input socket on a auxiliary switch terminal.

 

[Hippos]

Thank you so much for looking through the post!
I managed to fix it. As you said it delivers power from the DC connection on board to the the FM part. I found the cable and it was connected directly to the board skipping the choke. It seems my father has done it years ago. No one knows why still

I fixed it and connected it the right way so good news. It works well now.

Thank you again. I appreciate you taking the time!
This topic is solved.

 

[ramussons]

The RF choke is to stop the FM signal flowing into the power lines. If this is not done,
the neighbours too can listen in on their radio since the FM signal is on the normal FM band.
Some others may complain about "interference" to their FM reception.

 

[73's de Edd]

Sir Hippos . . . . . . . . .

I managed to fix it. As you said it delivers power from the DC connection on board to the the FM part.

How about reading below my RED line as my researched evaluation as to the function of that free floating choke coil , in its REALLY having opened up the inputted audio into your add on FM transmitter . . . . . . and I assume my mentioned 3 frontal wires were being DEAR OLE DADS add on.

_____________________________________________________________________________________________________________________________________________________________
INITIAL WRITE UP . . . . .
Fortunately, there is being only one inductor in that SUNNY unit . . . . L302.
Consult top left corner schematic and you see that it completes a ground connection of the Line output to your FM stereo transmitter to both of the grounds of te headphone jacks as well as the ACTUAL circuit ground at the bottom.
Your floating CIRCLED RED wire end connection is not doing that function, so no line output audio signal is getting to the transmitter input.
The next image down is a foil pattern . . . . . but alas . . . a Xerox 10th copy of a Xerox results in low def KRAP!.
I did put in a GREEN dot at the line out ground connection and you would expect that there is a joining foil bridge to the connection just below and to the left from it.
That would have the ground path flowing down and into the L302 and out the L3o2 to the BLACK dot that I have drawn in.

Now look at your photo where I have 3 YELLOW STARS drawn in, and to the left star I can see a smaller black wire soldered in. If you have an ohmmeter and know how to use it, stab one probe into that foiil and check for a short to the adjjunct yellow star positions, as well as that far left copper foil shielded amalgamation.
I am expecting all of those to be grounded, MOST IMPORTANTLY NOW . . . . checck out that foreground YELLOW STAR to see if it directly connects also.
I suspicion the RED and ORANGE/YELLOWISH wires to be the R and L channel outputs and that black wire ? YELLOW STAR to be ground. If this not an add on to the Sony.
I stand by . . . . .cuz I just don't know how much more help you will require . . . . . .

THE BIG PICTURE . . . .


73's de Edd . . . . .