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Found a JVC QL-F4, it turns to fast(45 sp),also it has funny…

Customer Question
Found a JVC QL-F4...

Found a JVC QL-F4, it turns to fast(45 sp),also it has funny record size knob,30,25,and17.Speed select doesn't do anything

Technician's Assistant: How long have you had your QL-F4?

Just a few days,off a auction

Technician's Assistant: What have you tried so far with your JVC product?

Powers up,plays in stereo,but turns to fast(45 speed ?),and speed control doesn't do anything

Technician's Assistant: Who makes your speaker or sound system?

JVC rs-33 receiver,2 Bose spks

Technician's Assistant: What have you tried so far with your RS-33?

Every thing works

Technician's Assistant: Anything else you want the Theater Expert to know before I connect you?

I do have knowledge,because of a NEI degree from the late 80s

Submitted: 7 months ago.Category: Recorders and Players
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Customer reply replied 7 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 7 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 24 minutes by:
12/28/2017
Electronics Technician: Louie, Technician replied 7 months ago
Louie
Louie, Technician
Category: Recorders and Players
Satisfied Customers: 13,491
Experience: 25+ yrs. experience in the field and 5+ yrs. online, down to component level.
Verified

Hi and welcome to JustAnswer. My name is ***** ***** I'll be assisting you with your question regarding your "...JVC QL-F4..."

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Electronics Technician: Louie, Technician replied 7 months ago

The described symptom "...turns to fast...speed control doesn't do anything..." would point to an internal hardware issue.

Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?

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Customer reply replied 7 months ago
First off, sorry for the delay,stupid bank.So yes,handy with both,multimeter,and iron
Customer reply replied 7 months ago
Not for the fee
Electronics Technician: Louie, Technician replied 7 months ago

Great on the DIY!
Please post back with clear pictures of the inside circuit board both component side and trace side. Click HERE.
http://ww2.justanswer.com/help/how-do-i-send-photo-or-file-expert-hl
These pictures would then serve as common references allowing me to see what you are seeing.

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Customer reply replied 7 months ago
I have some work to do then,can we continue tommorow?
Electronics Technician: Louie, Technician replied 7 months ago

I understand.

And yes please; tomorrow or when conveniently able.

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Customer reply replied 7 months ago
I need to ask a tech a couple things about a JVC QL-F4 turntable
Electronics Technician: Louie, Technician replied 7 months ago

Hi again and welcome back to JustAnswer. My name is ***** ***** I started assisting you last December.

...or would you prefer a second opinion / alternate approach by another member of the site?

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Customer reply replied 7 months ago
Hi again, I put a meter on the power circuit,and I didn't get a DC voltage out of the transformer,AC in but nothing out. Is that possible,and still have turn to fast?
Electronics Technician: Louie, Technician replied 7 months ago

The transformer's output would also be AC; 33V.

It would only be DC after the bridge diodes D810 ~ D813.

It would be 22.0V DC after the emitter of regulator transistor X815 and 5.22V after the emitter of X814.

As a preliminary test, please check the above voltages.

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Customer reply replied 7 months ago
I will,have to charge phone now let you know tommorow
Electronics Technician: Louie, Technician replied 7 months ago

I understand; tomorrow or when able.

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Customer reply replied 7 months ago
Hi, I got just 2.8 ac out of the transformer,and barely even 1 v DC past the supply diodes
Electronics Technician: Louie, Technician replied 7 months ago

As posted sometime ago, pictures please....of the circuitry and even the multi-meter.

Thanks.

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