Joe McElvenney wrote:

Hi,

Strapped directly across the b-e junction of a TIPL755A bipolar in a
SMPS out of a HP54502A scope is the following -

Body - cylindrical, black plastic, 5/8" long by 1/4" dia.

Body markings - MCS MTS 90A.

Leads - two, axial.

PCB marking - S1.

Polarity markings - nil.

Condition - s/c.

Naturally I don't have a schematic but my guess is that it's some sort
of over-voltage clamp. A great deal of googling hasn't helped me so
any info would be much appreciated.

Happy Holidays - Joe


It doesn't appear to have the schematic but the 'service' manual is
available for free at the manufacturer's website:
http://www.home.agilent.com/agilent/techSupport.jspx?pid=54502A%3Aepsg%3Apro&pageMode= MN&cc=US&lc=eng


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