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From: unclefreddy on 26 Oct 2005 23:37
if I press [play] the take up reel side doesn't spin, if I help it along a
bit it does ok for a few seconds then if it spins too fast, it bounces and
starts spinning the wrong way for a second the tape goes slack then it
speeds up to catch up and the tape is hanging so low at this point it
snags on the speed calibration knob. Ideally spare parts would be easy to
get and this would be a simple DIY job, I have my doubts though (although
my disassembly to look at the take up motor makes the labor look
part straight forward)


From: James Perrett on 27 Oct 2005 08:54
On Thu, 27 Oct 2005 03:37:45 GMT, unclefreddy <unclefreddy(a)jerky.com>
wrote:

> if I press [play] the take up reel side doesn't spin, if I help it along
> a
> bit it does ok for a few seconds then if it spins too fast, it bounces
> and
> starts spinning the wrong way for a second the tape goes slack then it
> speeds up to catch up and the tape is hanging so low at this point it
> snags on the speed calibration knob. Ideally spare parts would be easy to
> get and this would be a simple DIY job, I have my doubts though (although
> my disassembly to look at the take up motor makes the labor look
> part straight forward)
>
>

Could be a tape tension sensor problem or a connector problem in the reel
motor driver circuitry. I don't know about the B16 but the E16 has all the
transport control circuitry on a large PCB with many connectors - it might
be worth trying to reseat all the connectors first.

Cheers

James.
From: Scott Dorsey on 27 Oct 2005 10:12
unclefreddy <unclefreddy(a)jerky.com> wrote:
>if I press [play] the take up reel side doesn't spin, if I help it along a
>bit it does ok for a few seconds then if it spins too fast, it bounces and
>starts spinning the wrong way for a second the tape goes slack then it
>speeds up to catch up and the tape is hanging so low at this point it
>snags on the speed calibration knob. Ideally spare parts would be easy to
>get and this would be a simple DIY job, I have my doubts though (although
>my disassembly to look at the take up motor makes the labor look
>part straight forward)

I gather from the description that this is a servo transport? You're going
to need the service manuals....
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
From: unclefreddy on 29 Oct 2005 23:39
On Thu, 27 Oct 2005 13:54:49 +0100, James Perrett wrote:

> On Thu, 27 Oct 2005 03:37:45 GMT, unclefreddy <unclefreddy(a)jerky.com>
> wrote:
>
>> if I press [play] the take up reel side doesn't spin, if I help it along
>> a
>> bit it does ok for a few seconds then if it spins too fast, it bounces
>> and
>> starts spinning the wrong way for a second the tape goes slack then it
>> speeds up to catch up and the tape is hanging so low at this point it
>> snags on the speed calibration knob. Ideally spare parts would be easy to
>> get and this would be a simple DIY job, I have my doubts though (although
>> my disassembly to look at the take up motor makes the labor look
>> part straight forward)
>>
>>
>
> Could be a tape tension sensor problem or a connector problem in the reel
> motor driver circuitry. I don't know about the B16 but the E16 has all the
> transport control circuitry on a large PCB with many connectors - it might
> be worth trying to reseat all the connectors first.

I suspect the tension sensor is the problem, if I fast forward a few
minutes into the reel, the problem disappears. It only happens if I have
less than 2-3 minutes of tape on the take up side.

Thanks for the reply.

From: Richard Crowley on 31 Oct 2005 11:50

"unclefreddy" <unclefreddy(a)jerky.com> wrote in message
news:pan.2005.10.30.03.39.00.665319(a)jerky.com...
> On Thu, 27 Oct 2005 13:54:49 +0100, James Perrett wrote:
>
>> On Thu, 27 Oct 2005 03:37:45 GMT, unclefreddy <unclefreddy(a)jerky.com>
>> wrote:
>>
>>> if I press [play] the take up reel side doesn't spin, if I help it along
>>> a
>>> bit it does ok for a few seconds then if it spins too fast, it bounces
>>> and
>>> starts spinning the wrong way for a second the tape goes slack then it
>>> speeds up to catch up and the tape is hanging so low at this point it
>>> snags on the speed calibration knob. Ideally spare parts would be easy
>>> to
>>> get and this would be a simple DIY job, I have my doubts though
>>> (although
>>> my disassembly to look at the take up motor makes the labor look
>>> part straight forward)
>>>
>>>
>>
>> Could be a tape tension sensor problem or a connector problem in the reel
>> motor driver circuitry. I don't know about the B16 but the E16 has all
>> the
>> transport control circuitry on a large PCB with many connectors - it
>> might
>> be worth trying to reseat all the connectors first.
>
> I suspect the tension sensor is the problem, if I fast forward a few
> minutes into the reel, the problem disappears. It only happens if I have
> less than 2-3 minutes of tape on the take up side.

Insufficient torque on the take-up spindle?
Frequently adjustable with a big resistor with a sliding tap.


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