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Which is the circuit where you have to get microonul? (my microphone was broken) I can help urgently?

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Buy a new mouth piece replacement. hope this helps

Posted on Aug 07, 2010

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Posted on Jan 02, 2017

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The mic doesnt work ...it use to but all the sudden it quit doesnt even key up so i can hear it my talk back


First, try another mic on the radio to be sure it's the mic and not the radio causing the problem. If it's the mic, check the wiring circuits for a bad switch or broken wire. Simply...the TX circuit is closed and the RX is open when the key is squeezed. The RX circuit is closed and the TX circuit is open when the key is released. Use a simple ohm meter to check for resistance between the pins on the mic (after removal from the radio of course). Open circuit will read 1, closed circuit should be very close to zero. You'll probably find the TX circuit never closes when the key is squeezed. Could be a broken wire or faulty switch in the handset.
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I removed the cable from microphone circuit board  and shortened cable by 20 cm. to eliminate damaged wires, stripped the individual wires and soldered the pins to the new wire ends and reassembled.  Used black heat shrink tubing  [10mm dia.] to reinforce cable end at mic to prevent future damage from careless handling.

Document wire colours to pins before disassembly

Red                   Audio L
White                 Audio R
Blue                   DC Power
Shield [ground]     Ground 
Yellow                 Video

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Stoves model number 059040404


try the simple things first. check continuity thro the grill element - likely the element is open circuit

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