Circuit Breaker Temperature (SAL 74B)

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phax
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Circuit Breaker Temperature (SAL 74B)

Post: # 41083Unread post phax
Fri Mar 04, 2016 8:24 am

hi,

i have a problem with the right channel of the circuit breaker.
when i move the cutting head down in the operating position, the temperature rises up to about 75°C without sending a signal to the head.
it's just on one channel...
what could it be? :roll:

thx for the help.

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Greg Reierson
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Re: Circuit Breaker Temperature (SAL 74B)

Post: # 41089Unread post Greg Reierson
Fri Mar 04, 2016 9:52 am

Try calibrating the 25C setting. That's basically room temperature and where the system should sit when it's idling.
Greg Reierson
http://www.RareFormMastering.com
VMS70 :: SAL74B :: SX74

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markrob
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Re: Circuit Breaker Temperature (SAL 74B)

Post: # 41090Unread post markrob
Fri Mar 04, 2016 11:48 am

Hi,

If I had to guess, I would look for a flaky connection in the temperature sensing bridge. If I understood correctly, the head measures properly until it is moved. That would indicate that the bridge that senses temperature is seeing a slightly higher drive coil resistance in the down position.

Mark

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jtransition
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Re: Circuit Breaker Temperature (SAL 74B)

Post: # 41094Unread post jtransition
Fri Mar 04, 2016 1:14 pm

I would also check the wires in the pigtail connector that connects the head to the suspension box.

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Phinster
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Re: Circuit Breaker Temperature (SAL 74B)

Post: # 41135Unread post Phinster
Mon Mar 07, 2016 5:51 am

Try turning off the amps for a few hours, see if it still does it....

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dubcutter89
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Re: Circuit Breaker Temperature (SAL 74B)

Post: # 41147Unread post dubcutter89
Mon Mar 07, 2016 1:15 pm

No expert on SAL74 but maybe this helps:

Have you tried measureing the head dc-resistance? Is it 4.7Ohm on both channels? Maybe it got damaged...
Have you tried what happens if you use a dummy head?
You could also pull out and interchange the Circuit Breakers - does the problem stay with the module?
Cleaning contacts (cable at amp, cable at suspension, internal contact (if there is one) in the head suspension, small cables on front to cutter)

Lukas
Wanted: ANYTHING ORTOFON related to cutting...thx

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jjgolden
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Re: Circuit Breaker Temperature (SAL 74B)

Post: # 41574Unread post jjgolden
Fri Mar 25, 2016 12:14 pm

Hi Phax,

Did you get this one resolved?

JJG

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phax
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Re: Circuit Breaker Temperature (SAL 74B)

Post: # 41961Unread post phax
Wed Apr 13, 2016 4:47 am

flo kaufmann had a look over the whole SAL yesterday.
it seemed to be a bad connection right behind the circuit breaker. it works again.
not easy to find since the machine was heavily customized back in the days..

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jjgolden
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Re: Circuit Breaker Temperature (SAL 74B)

Post: # 41964Unread post jjgolden
Wed Apr 13, 2016 11:27 am

Great to hear :)

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