| Author |
Message |
    
Axisman868
| | Posted on Monday, January 20, 2003 - 12:19 pm: | 
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for a 2950 how do you it |
Inspector
| | Posted on Monday, January 20, 2003 - 5:02 pm: |
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In the EPT295013z main board, the R-beep duration is controlled by the value of capacitor C152 (.022pF)...the pitch is controlled by resistor R-229... |
Ryan
| | Posted on Monday, January 20, 2003 - 8:37 pm: |
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theres only one question....why? |
2600
| | Posted on Tuesday, January 21, 2003 - 12:48 am: |
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Why?
The answer I always get is "aggravation value". Inspector covered duration and pitch. To make it louder, change R179 from 1.5 Megs to a smaller value. The lower the value of this resistor, the louder it will be, up to a limit. Making it less than 100K could make the beep tone act funny, or shut down.
Uhh, P.S. I rechecked the schemo. The DURATION (length) of the beep is controlled by the value of C146. It comes with a 2.2 uF. A larger value makes it longer. 10 uF will make it a couple of seconds long, more or less.
73 |
Axisman868
| | Posted on Tuesday, January 21, 2003 - 2:32 am: |
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okay so Longer is c146
louder is what resistor 229 or 179 |
Tech671
| | Posted on Tuesday, January 21, 2003 - 5:14 am: |
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Dropping value of 179 will increase volume, dropping value of 229 will raise the pitch. |
Axisman868
| | Posted on Tuesday, January 21, 2003 - 10:08 am: |
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so i need a 150kohm for 229 and a 100kohm for 179 any one know approximate location on board |
2600
| | Posted on Sunday, January 26, 2003 - 12:33 am: |
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Okay Axisman, with the component side of the circuit board facing up at you, and the front of the radio toward you, R229 is 7/8 of an inch in from the right (your right) side of the circuit board, and 7/8 inch toward the rear from the front edge. It is alongside the flat face and to the right of the beep transistor Q33.
Changing R229 will get you a modest change in pitch. You didn't say how much you wanted to drop it.
73 |
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