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The flat relay closest to the plug-in relay is the receiver preamp. And if someone removed it a short wire jumper can take its place. The flat relay farthest from the plug-in socket is the only one that's activated by the radio's carrier. The contacts in that one activate the plug-in relay and the HV relay.

The flat relays were supposed to be sealed, but the glue holding the top cover will degrade and let go. Or it could be that someone removed it to clean the contact points.

If you hear a "click" when keying the radio, but the mechanism inside the plug-in relay doesn't activate, that flat relay is probably the problem.

I would also have a close look at the plug-in relay under a bright light. The clear plastic cover should not have any smudges on the inside that are near the contact points. Likewise, have a look at the color of the exposed metal on the contact lever. If one side is darker than the other, this is a high-mileage relay. The metal will darken over time from heat. Only the output side gets this stress, so the input side lever will show the original color.

Have a look at those details. Let us know what you find.

73

<blockquote data-quote="nomadradio" data-source="post: 762971" data-attributes="member: 22">The flat relay closest to the plug-in relay is the receiver preamp. And if someone removed it a short wire jumper can take its place. The flat relay farthest from the plug-in socket is the only one that&#039;s activated by the radio&#039;s carrier. The contacts in that one activate the plug-in relay and the HV relay. The flat relays were supposed to be sealed, but the glue holding the top cover will degrade and let go. Or it could be that someone removed it to clean the contact points. If you hear a &quot;click&quot; when keying the radio, but the mechanism inside the plug-in relay doesn&#039;t activate, that flat relay is probably the problem. I would also have a close look at the plug-in relay under a bright light. The clear plastic cover should not have any smudges on the inside that are near the contact points. Likewise, have a look at the color of the exposed metal on the contact lever. If one side is darker than the other, this is a high-mileage relay. The metal will darken over time from heat. Only the output side gets this stress, so the input side lever will show the original color. Have a look at those details. Let us know what you find. 73</blockquote>

[QUOTE="nomadradio, post: 762971, member: 22"] The flat relay closest to the plug-in relay is the receiver preamp. And if someone removed it a short wire jumper can take its place. The flat relay farthest from the plug-in socket is the only one that's activated by the radio's carrier. The contacts in that one activate the plug-in relay and the HV relay. The flat relays were supposed to be sealed, but the glue holding the top cover will degrade and let go. Or it could be that someone removed it to clean the contact points. If you hear a "click" when keying the radio, but the mechanism inside the plug-in relay doesn't activate, that flat relay is probably the problem. I would also have a close look at the plug-in relay under a bright light. The clear plastic cover should not have any smudges on the inside that are near the contact points. Likewise, have a look at the color of the exposed metal on the contact lever. If one side is darker than the other, this is a high-mileage relay. The metal will darken over time from heat. Only the output side gets this stress, so the input side lever will show the original color. Have a look at those details. Let us know what you find. 73 [/QUOTE]

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