VCR motors info wanted
No Spam Please
I found this group from the repair faq web pages and I thought someone here
might be able to help me out with some info.
I recently took a couple of 'dead' VCR's apart to salvage the Power sup's and
a few odds and ends for another project when I discovered all those neat
looking motors inside. The drum motor is especially fascinating to me, as is
the flat motor that drives the tape mechanism. I have not had much need to
learn about brushless motors in the past as my hobby of choice is Tesla coiling
and other high voltage projects, but I am curious as to the way these things
work now that I have a couple to look at. Can anyone here either explain how
they work or point me to someplace else online with that kind of info? Also
some simple pointers as to the pin out and power requirements to just make them
turn again, on their own, would be much appreciated. The ones I have are a JVC
and some brand that I think was a Funai. Although just some basic info might
help curb my curiosity.
Thanks again!
Out of school but still learning,
Marc S
Sofie
Without the proper drive support circuitry and driver chip you will not get
it to turn. It is not a motor that you can just put a pair of wires from a
battery on it and make it go.
--
Best Regards,
Dan Sofie
Electronics Supply & Repair
==============================================
No Spam Please <mshoc...@aol.comremove> wrote in message
news:20010201115115...@ng-cf1.aol.com...
No Spam Please
>Without the proper drive support circuitry and driver chip you will not get
>it to turn. It is not a motor that you can just put a pair of wires from a
>battery on it and make it go.
>--
>Best Regards,
>Dan Sofie
>Electronics Supply & Repair
Obvoiusly, that is why I was asking about the pin outs of the subassemblies in
an appliance repair group. I have the subassemblies, intact, with what I assume
is the driver circuitry for the brushless motor. I should have powered the
things up and looked at the pins with some instruments before demolishing them
(yes they worked, just not well) but I didn't think about this stuff being in
there until it was too late. I don't have a schematic or even a working
knowledge of the insides of a VCR and mostly just out of curiosity was hoping
someone here could give me some solid info as to what kind of voltage and or
signal needs to be applied to which pin to make it go.
In the JVC drum motor there is a small connector that is on the circut board
surrounding the motor windings with only 4 pins in it apparently named CN1.
This board carries the windings, and several SMT components including a chip
labeled VC5032. And there is a thin membrane ribbon cable with about 14 traces
on it coming through a hole in the side of the stationary part of the drum
which I assume is the bus for the stream coming off the tape. Question is, what
voltage, AC or DC, is applied to which of the 4 pins and does it need some kind
of clock pulse or some other signal to run. With only 4 pins it can't be that
difficult to do. Can it?
The motor for the tape mechanism also has it's circuit board which appears to
be laminated to a steel backing plate which acts as the mount. It has some
surface mount odds and ends including a chip labeled VC5033 along with 6 wound
flat coils and some kind of sensor looking at the edge of the rotating disk. It
has a 7 pin connector on it. Can it be made to run in this condition?
Again thanks for any info,
marc
u1061771156
> I don't have a schematic or even a working
>knowledge of the insides of a VCR and mostly just out of curiosity was hoping
>someone here could give me some solid info as to what kind of voltage and or
>signal needs to be applied to which pin to make it go.
You might try investing in a schematic. Try your local public library.
> In the JVC drum motor there is a small connector that is on the circut board
>surrounding the motor windings with only 4 pins in it apparently named CN1.
>This board carries the windings, and several SMT components including a chip
>labeled VC5032.
Sounds like a typical self-contained motor driver chip.
> And there is a thin membrane ribbon cable with about 14 traces
>on it coming through a hole in the side of the stationary part of the drum
>which I assume is the bus for the stream coming off the tape.
Right, from the rotary transformer inside the drum.
>Question is, what
>voltage, AC or DC, is applied to which of the 4 pins and does it need some kind
>of clock pulse or some other signal to run. With only 4 pins it can't be that
>difficult to do. Can it?
I don't think you ever said what model of JVC VCR it came from, which would
help. However from the schematic of a JVC HR-D910 that I have handy, the
4-pin connector CN1 has pinout:
1 = +13V
2 = GND
3 = Drum FG/PG. This is an output to the control servo circuit.
4 = Drum drive. Input, voltage controls speed of motor. Typically 2.5V.
FG/PG is a pulse stream, from which the drum frequency and phase are
locked to either the record signal or a reference for playback.
You should have no trouble getting this motor to run, I think. A quick
sanity check that pins 1,2 are the same (e.g. thick tracks, polarity
and voltage consistent with any capacitors on the board) before powering
up would be wise...
> The motor for the tape mechanism also has it's circuit board which appears to
>be laminated to a steel backing plate which acts as the mount. It has some
>surface mount odds and ends including a chip labeled VC5033 along with 6 wound
>flat coils and some kind of sensor looking at the edge of the rotating disk. It
>has a 7 pin connector on it. Can it be made to run in this condition?
Again from the HR-D910:
_______
1 = CAP REV I guess this is a direction control. TTL logic level.
2 = SWD 5V Switched 5V (i.e. on when VCR out of standby)
3 = CAP FG Output, pulse stream to servo circuit
4 = GND Ground for analog circuitry
5 = GND (M) Ground for motor current
6 = CAP CTL V Input, voltage controls speed. Typically 1.8V
7 = MOTOR +13V
I think this one should be easy enough too.
>Again thanks for any info,
>
>marc
Hope this helps,
Mike.
Kahlua53
Some of them he could like the cassette loading motors.
Remove NoSpam to reply, Thanks