Question about replacing a relay

[[email protected]]

I want to check the speaker relay in my audio receiver.
The relay is a DEC Type DH2SU 24VCD SSY134.

Do I need a special tool to remove the housing?

 

[Steve Nosko]

Some medium and large relays have a snap-on cover / housing. Smaller ones
are sealed-epoxied shut. If it is not removable, you may not be able to
easily tell. A look at the bottom (lead egress face) can tell. Some of the
snap-on covers have, I'll call them, dimples or notches on the longer sides.
This is where the cover "locks" onto the base -- tab and slot style.

Perhaps you can measure the coil voltage to see if it is _getting_ power,
then measure contact resistance (with NO audio out). I don't know when it
would be energized, so its hard to suggest further things. Speaker relay.
When is it on / off?

Steve N.


Steve N.

 

[[email protected]]

When is it on / off?

It energizes about 2 seconds after the receiver is turned on.
I was able to get the housing off by squeezing it lengthwise.

I verified that the contacts are closing when the coil is energized,
and I cleaned the contacts just to be sure.

Yeah, I said I was going to throw this Technics receiver away, but I
just can't...it's too nice.

I'm going to bite the bullet and take it to a repair shop next week.
If their estimate is more than I want to pay, they will buy the unit
from me, fix it, and resell it.

I'm dying to know what would cause it to quit the way it did.

 

[Tim Marcus]

In my experience, you can use a really small screwdriver, or a pick to
open up the housing. Once in there, you can clean the contacts really
carefully - you do not want to bend anything. I have not seen too many
bad relays - usually they malfunction as a result of something else -
like the diode right near them, or a high ESR cap nearby. Hope this
helps - Tim