Steve writes:

On Sun, 9 Dec 2007 20:25:58 -0000, "N Cook"
wrote:

Steve wrote in message
news
We have a blown Hastings VT-4B. The part is D3 as listed in
http://www.repairfaq.org/sam/vt46sch.gif
The original part number looks like V1301A1 (13-10-076A). I can't
find any specs on this part. Anyone have a datasheet or specificatins
for this?

All help appreciated.

Steve

Is that a varistor or non-polarised transient suppressor of 130V rating?

No clue. The original is history, the customer plugged the unit into
230V. No way to see any case markings or even physical dimentions of
the original.

I don't know exactly what technology that is, but it's function is a surge
suppressor. The unit will run if that part is removed. Whether anything
else has been damaged, only way to know is to try it. I'd suggest checking
D1, D2, C1, and R3. If they are good (or after replacing whatever isn't!),
try it without D3.

130 V may be a bit close to 125 VAC, maybe 140 or 150 V? Replace with
modern device and add a fuse while you're at it. With the fuse, even
if D3 isn't replaced with anything, a surge or plugging into 230 VAC shouldn't
result in damage beyond D1 in any case.

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