no. i mean only the sensor of a 800k drive...
On 9 mrt 2011, at 09:58, Terry Stewart wrote:
> Yes, I did think of that., but I want to keep a 400 drive in there if I can. If things don't work out, this is an option.
>
> Terry
> ----- Original Message ----- From: "simon" <simski_at_email.domain.hidden>
> To: <lisalist_at_email.domain.hidden>
> Sent: Wednesday, March 09, 2011 9:43 PM
> Subject: Re: Apple 400k drive
>
>
>> maybe you can get them from a newer 800k or 1.4 drive or even a pc drive. furthermore some motors in laserprinters use the same technique.
>>
>> On 9 mrt 2011, at 00:07, Terry Stewart wrote:
>>
>>> Hi Helmut,
>>>
>>> I'm not sure of the exact part description of the passive hall sensor.
>>>
>>> In the first instance, I'm going to try and identify which ones are faulty, and mix and match so that out of two non-working drives I get at least one that behaves as it should.
>>>
>>> Terry
>>>
>>> ----- Original Message ----- From: "Diogenes45" <helmut_post_at_email.domain.hidden>
>>> To: "LisaList" <lisalist_at_email.domain.hidden>
>>> Sent: Tuesday, March 08, 2011 9:48 PM
>>> Subject: Re: Apple 400k drive
>>>
>>>
>>> Hello Patrick,
>>> and greetings from Helmut Post!
>>> Do you remember me?
>>> My third IDE File is running very well!
>>> Back to the topic: What is the exact part description of the passive
>>> hall sensor?
>>> Perhaps I know a place where to get obsolete and very hard to find
>>> parts.
>>> Lately I purchased 2 Z8 processors (Zilog 8631) with 4 KB XROM for
>>> the 10 MB Profile - these are very hard to get, but there are still at
>>> least more than 40000 pieces left today. The price was $ 4.06 for
>>> each part.
>>>
>>> Helmut
>>>
>>> On 8 Mrz., 08:24, PSchaefer <dr.p.schae..._at_email.domain.hidden> wrote:
>>>> On 7 Mrz., 21:18, "Terry Stewart" <te..._at_email.domain.hidden> wrote: >>>> >>>> > I've been in discussion with folk on the classic computer mailing list > > about >>>> > this. The feeling was it could have either been the TA7259 motor > > controller >>>> > IC, the associated caps or on of the hall-effect devices in the motor >>>> > controller IC itself. >>>> >>>> Usually this is attributed to the hall effect sensors which get a >>>> voltage offset. >>>> >>>> With a good sensor, you can measure half the supply voltage at the >>>> outputs when no magnetic field is applied. The difference between both >>>> output terminals goes positive or negative, depending on the field >>>> direction. >>>> >>>> With a bad part, this signal is shifted towards the positve or >>>> negative direction. Therefore its zero crossing is not at the point >>>> where the controller expects it, which makes the signal unreadable. >>>> >>>> A drive with one faulty sensor will spin when started manually, >>>> otherwise it will do nothing or oscillate. With two broken sensor, the >>>> motor cannot operate at all. >>>> >>>> Up to now I did not find suitable replacements for the passive hall >>>> sensors used in the 400k drives. >>>> >>>> Patrick
>> >> -- >> Groeten, >> >> Simon >> simski_at_email.domain.hidden >> >> >> >> -- >> ----- >> You received this message because you are a member of the LisaList group. >> The group FAQ is at http://lowendmac.com/lists/lisa.html >> To post to this group, send email to lisalist_at_email.domain.hidden >> To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden >> For more options, visit this group at http://groups.google.com/group/lisalist >> >> >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 10.0.1204 / Virus Database: 1497/3492 - Release Date: 03/08/11 > > -- > ----- > You received this message because you are a member of the LisaList group. > The group FAQ is at http://lowendmac.com/lists/lisa.html > To post to this group, send email to lisalist_at_email.domain.hidden > To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden > For more options, visit this group at http://groups.google.com/group/lisalist
--
Groeten,
Simon
simski_at_email.domain.hidden
-- ----- You received this message because you are a member of the LisaList group. The group FAQ is at http://lowendmac.com/lists/lisa.html To post to this group, send email to lisalist_at_email.domain.hidden To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden For more options, visit this group at http://groups.google.com/group/lisalistReceived on 2015-07-15 16:52:54
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