Advice Needed Technics st-gt650 fm tuning issue

[Darryl]

And does anybody know the info on this part its value etc

 

[Channel Hopper]

RL14B005-Z

 

[Darryl]

Thanks for your reply.
I do have that from the service manual but cant find any online

 

[jeallen01]

I was on the idea that ferrite is ferrite and just replace the core screw considering it only screws through a coil

There are many grades of ferrites with different permettivities - some are optimised for low frequencies, some for medium frequencies - and so on.!

 

[Darryl]

So if I try a few that will fit and it brings the discriminator value down to a close 0v would that be ok?

 

[jeallen01]

I'm guessing but I suspect that you need a coil - and thus core - that is optimised for the frequency range over which the discriminator operates.

Never delved into how those work but this page seems to indicate that it might be about 300-1300Hz - if so, then you need a coil/core suitable for that range, and thus not from a superhet receiver IF filter (e.g. 455-465kHz, 10.7MHz, etc...)????

 

[Channel Hopper]

You could take one out of another FM radio, anything from the 80-90s should be suitable.

 

[Darryl]

I do have in the loft the complete board from a 28" Toshiba model 2873DB there maybe a few on that

 

[Terryl]

A few screen shots of my damage.
I guess I should have used the correct tool and last night I thought why the dam didn't I use a matchstick to try and not a jewelry Phillip's Screwdriver

You should use a non-metallic, or non-ferrous adjustment tool on any ferrite cored coil, the metal tool will affect the outcome.

What is normally used is a square tip (or other type tip) plastic/nylon tuning tool, or if you can find one now days a ceramic tuning tool.

As for a replacement coil or ferrite, try here if you know the value.......

https://www.coilcraft.com/en-us/products/rf/tunable-rf-inductors/

 

[Darryl]

You should use a non-metallic, or non-ferrous adjustment tool on any ferrite cored coil, the metal tool will affect the outcome.

What is normally used is a square tip (or other type tip) plastic/nylon tuning tool, or if you can find one now days a ceramic tuning tool.

As for a replacement coil or ferrite, try here if you know the value.......

https://www.coilcraft.com/en-us/products/rf/tunable-rf-inductors/

Looks like a good side but I just dont know the value of the damaged one.
If Anybody is will to accept the service manual from me by email might help identifying the little bugger lol

 

[Darryl]

Service manual attached

 

[Darryl]

I make have struck Gold so bear with me I'm having a look at this.

Ohhh thanks for everybody's help

 

[Darryl]

RL14B005-Z Datasheet, PDF

RL14B005-Z Datasheet. 1MbKb/16P. Part #: RL14. Manufacturer: Amphenol Corporation. Description: Thermometrics temperature sensor solutions. 25 Results. Part #: RL1403-119-85-K. Datasheet: 70Kb/2P. Manufacturer: Amphenol Corporation.

www.alldatasheet.com

 

[Darryl]

RL14B005-Z Datasheet, PDF

RL14B005-Z Datasheet. 1MbKb/16P. Part #: RL14. Manufacturer: Amphenol Corporation. Description: Thermometrics temperature sensor solutions. 25 Results. Part #: RL1403-119-85-K. Datasheet: 70Kb/2P. Manufacturer: Amphenol Corporation.

www.alldatasheet.com

False alarm still nothing

 

[Channel Hopper]

I make have struck Gold so bear with me I'm having a look at this.

Ohhh thanks for everybody's help

Nothing wrong with your reception then

Gold 104.3 - Wikipedia

en.m.wikipedia.org

 

[Darryl]

No that's ok.
One thing I have tried in the manual it says tune to 100.10mhz and set discriminator to 0v which I did with ariel in loft connected but when I tuned back to 97.00fm ( Heart Plymouth) the 0v is now showing more like -1.32 etc what should I do set the 0v on 97.00 with or without atrial connected and be done with it?

 

[Darryl]

I have done that I set to 97.00fm heart plymouth then I bought it down to 0v but if I turn the tune dial the voltage varies then.
Plus I broke the core in the discriminator canister but radio is receiver as it should now and not .05mhz out of range.
Can a replacement core be screwed into place Jack?

I did connect the multimeter to the 2 points but what I would like to know is there are 2 resistors after the coil on the board and which side of them should I test.