[time-nuts] HP 3458A ISOLATOR DTACK err @ pwr up

[Brooke Clarke]

Hi John:

It's hard to say.  With the A4 Inguard p.s. board removed when powered up the 
fan comes on and the display lights up with the error message.

So, measured on the primary side, there's 25 ma AC current going to the 
transformer then to the Outguard p.s. and fan.

Have Fun,

Brooke Clarke
http://www.prc68.com

J. Forster wrote:
> Looks like it. Does the transformer draw much current with the PCB
> removed? If it has shorted turns, as it appears, it likely will. Does it
> get hot?
> 
> -John
> 
> =================
> 
> 
>> Hi:
>>
>> I think the power transformer got cooked.  Have a look at the Vac and Ohms
>> data:  http://www.prc68.com/I/HP3458DVM.shtml#T1
>>
>> Force a browser refresh to see the latest schematic.
>>
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.prc68.com
>>
>>
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> 
>