Re: [time-nuts] 5370B stop trigger not working

[Jim Palfreyman]

Thanks Chris.

I'm beginning to think my 5370B is heading towards a boat anchor.

We (as in all time-nut owners of 5370s) seriously need to research a
replacement part/circuit for the 7061/7062 parts.


Jim


On 22 December 2015 at 07:44, Christopher E. Brown  wrote:

>
> You might want to re-scope the start and stop channel outputs where they
> cross A4 and
> verify against the front panel labels.
>
> The signal line crossing A4 that lines up with frontpanel start is start
> and the one that
> lines up with stop is stop.
>
>
> I mention this because the A3 board is a carry over from another unit and
> the start/stop
> labeling on the board itself is reversed from the 5370B front panel labels
> and the parts
> list follows the board labeling.  So, if you read front panel and lookup
> P/N in list you
> get the wrong one.
>
>
> The safe thing is to follow back from the output crossing A4 that is
> failing and
> physically pull the hybrid and read the P/N on the mounting frame.  It
> should be a metal
> can in a screw together frame, the part is socketed.
>
>
> Once the A3 is out, do not remove the screws in frame, they just clamp the
> frame to part.
>  Whole thing is held in by the collar on the pot shaft.
>
>
> For a 5370B
>
> 5088-7061 (start channel hybrid)
> 5088-7062 (stop channel hybrid)
>
> the manual lists it reversed, and they are actually different parts (not
> just diff
> mounting frames) with crossed up triggers.
>
>
> 7061 (actual start manual lists as stop) is the one that usually fails and
> is almost
> impossible to find.  Took me several years (and the help of another nut
> with a parts unit)
> to get a working one.  7062 is much easier to find.
>
>
> On 12/13/2015 11:26 AM, Jim Palfreyman wrote:
> > Oops yes! I looked up the wrong item. I meant A3U1 which is 5088-7061
> >
> > Jim
> >
> >
> > On Sunday, 13 December 2015, Cok  wrote:
> >
> >> According to the partlist A4U1 and A4U2 seems to be TL072CP opamps.
> >>
> >>>
> >>> jim77...@gmail.com said:
> >>>
>  I have gone through the troubleshooting process from the manual and it
>  seems
>  to point to A4U2 (Schmidt trigger) being faulty.
> 
> >>> I'd put a scope on it to check.
> >>>
> >>> Before I dive into this, does anyone have any advice? Most important
> being
>  the Schmidt trigger - where do I get one?
> 
> >>> You need more info - the manufacturer's part number or something like
> >>> that.
> >>>
> >>>
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Re: [time-nuts] 5370B stop trigger not working

[Christopher E. Brown]

You might want to re-scope the start and stop channel outputs where they cross 
A4 and
verify against the front panel labels.

The signal line crossing A4 that lines up with frontpanel start is start and 
the one that
lines up with stop is stop.


I mention this because the A3 board is a carry over from another unit and the 
start/stop
labeling on the board itself is reversed from the 5370B front panel labels and 
the parts
list follows the board labeling.  So, if you read front panel and lookup P/N in 
list you
get the wrong one.


The safe thing is to follow back from the output crossing A4 that is failing and
physically pull the hybrid and read the P/N on the mounting frame.  It should 
be a metal
can in a screw together frame, the part is socketed.


Once the A3 is out, do not remove the screws in frame, they just clamp the 
frame to part.
 Whole thing is held in by the collar on the pot shaft.


For a 5370B

5088-7061 (start channel hybrid)
5088-7062 (stop channel hybrid)

the manual lists it reversed, and they are actually different parts (not just 
diff
mounting frames) with crossed up triggers.


7061 (actual start manual lists as stop) is the one that usually fails and is 
almost
impossible to find.  Took me several years (and the help of another nut with a 
parts unit)
to get a working one.  7062 is much easier to find.


On 12/13/2015 11:26 AM, Jim Palfreyman wrote:
> Oops yes! I looked up the wrong item. I meant A3U1 which is 5088-7061
> 
> Jim
> 
> 
> On Sunday, 13 December 2015, Cok  wrote:
> 
>> According to the partlist A4U1 and A4U2 seems to be TL072CP opamps.
>>
>>>
>>> jim77...@gmail.com said:
>>>
 I have gone through the troubleshooting process from the manual and it
 seems
 to point to A4U2 (Schmidt trigger) being faulty.

>>> I'd put a scope on it to check.
>>>
>>> Before I dive into this, does anyone have any advice? Most important being
 the Schmidt trigger - where do I get one?

>>> You need more info - the manufacturer's part number or something like
>>> that.
>>>
>>>
>> ___
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
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> and follow the instructions there.
> 

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Re: [time-nuts] 5370B stop trigger not working

[Hal Murray]

jim77...@gmail.com said:
> I have gone through the troubleshooting process from the manual and it seems
> to point to A4U2 (Schmidt trigger) being faulty. 

I'd put a scope on it to check.

> Before I dive into this, does anyone have any advice? Most important being
> the Schmidt trigger - where do I get one? 

You need more info - the manufacturer's part number or something like that.

-- 
These are my opinions.  I hate spam.



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Re: [time-nuts] 5370B stop trigger not working

[Cok]

According to the partlist A4U1 and A4U2 seems to be TL072CP opamps.


jim77...@gmail.com said:

I have gone through the troubleshooting process from the manual and it seems
to point to A4U2 (Schmidt trigger) being faulty.

I'd put a scope on it to check.


Before I dive into this, does anyone have any advice? Most important being
the Schmidt trigger - where do I get one?

You need more info - the manufacturer's part number or something like that.



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Re: [time-nuts] 5370B stop trigger not working

[Jim Palfreyman]

Yes I've been through the process in the service manual with an
oscilloscope and the part number of the Schmitt trigger (apologies for the
auto-corrected spelling above) is TL072CP.

What I'm after is any "gotchas" or hints before I head down this path.


Jim Palfreyman


On 13 December 2015 at 18:06, Hal Murray  wrote:

>
>
> jim77...@gmail.com said:
> > I have gone through the troubleshooting process from the manual and it
> seems
> > to point to A4U2 (Schmidt trigger) being faulty.
>
> I'd put a scope on it to check.
>
> > Before I dive into this, does anyone have any advice? Most important
> being
> > the Schmidt trigger - where do I get one?
>
> You need more info - the manufacturer's part number or something like that.
>
> --
> These are my opinions.  I hate spam.
>
>
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] 5370B stop trigger not working

[Jim Palfreyman]

Oops yes! I looked up the wrong item. I meant A3U1 which is 5088-7061

Jim


On Sunday, 13 December 2015, Cok  wrote:

> According to the partlist A4U1 and A4U2 seems to be TL072CP opamps.
>
>>
>> jim77...@gmail.com said:
>>
>>> I have gone through the troubleshooting process from the manual and it
>>> seems
>>> to point to A4U2 (Schmidt trigger) being faulty.
>>>
>> I'd put a scope on it to check.
>>
>> Before I dive into this, does anyone have any advice? Most important being
>>> the Schmidt trigger - where do I get one?
>>>
>> You need more info - the manufacturer's part number or something like
>> that.
>>
>>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
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[time-nuts] 5370B stop trigger not working

[Jim Palfreyman]

Hi all,

My stop trigger has stopped working on my 5370B (a while back - just
getting around to fixing it).

I have gone through the troubleshooting process from the manual and it
seems to point to A4U2 (Schmidt trigger) being faulty.

Fixing this looks like a decent job of: sourcing a part, removing the front
panel, removing board A4, desoldering, and reassembling.

Before I dive into this, does anyone have any advice? Most important being
the Schmidt trigger - where do I get one?


Regards,

Jim Palfreyman
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