"Sam Goldwasser" wrote in message
...
"George R. Gonzalez" writes:

1N4007 is *much* more likely. These are black plastic,
about the size of a grain of rice.

Or, 1N47something zeners. The printing is on two lines.

Yea, I think it did have another line. I figured 1n47 was it.

The screen printing on the board designates them as Z1 and Z2 so,
they very well could be zeners.

I'll check when I get home.

Thanks guys.

db




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I found (2) 1n47 diodes next to the original bad diodes. One of them
is shorted and the other appears open. Our local electronics store
has unfortunately closed down after 50 years of service and I would
rather not have to special order these diodes.

Hi,
as already said: 1N47xx zeners, the last two figures would indicate
the voltage, so you obviously need to find a way to find out the
original voltage. Does one really measure open (also in forward
direction) ? Then the voltage to something would probably have gone
way too high, bad if was the supply to the controller or some othe
chip you cannot buy. I have seen zeners in microwaves going short
quite often, they are run at maximum power dissipation even in stand
by.

"Stefan Huebner" wrote in message
...

I found (2) 1n47 diodes next to the original bad diodes. One of them
is shorted and the other appears open. Our local electronics store
has unfortunately closed down after 50 years of service and I would
rather not have to special order these diodes.

Hi,
as already said: 1N47xx zeners, the last two figures would indicate
the voltage, so you obviously need to find a way to find out the
original voltage. Does one really measure open (also in forward
direction) ?

Yes. They are both connected at one end and face in opposite directions
and the other one has shorted.

Then the voltage to something would probably have gone
way too high, bad if was the supply to the controller or some othe
chip you cannot buy.

uuuuughhgh.

db




I have seen zeners in microwaves going short
quite often, they are run at maximum power dissipation even in stand
by.