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| bc220 scanner deaf http://www.interceptradio.com/bbs/viewtopic.php?f=1&t=5321 |
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| Author: | tonyclark [ Sat Apr 30, 2011 9:18 am ] |
| Post subject: | bc220 scanner deaf |
Everything working just is deaf, tried different antennas. There is a red L.E.D. on the board it is not lit, is it suppost to be? What is it function? Everything is tight I don't see any loose solder joints. Any place to start looking? |
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| Author: | SpudGunMan [ Sat Apr 30, 2011 9:37 am ] |
| Post subject: | Re: bc220 scanner deaf |
don't know anything about the scanner but just the basics you sure its not a volume issue? squelch etc... headphones get any reaction putting squelch up to 100% etc could also try a reset on the CPU no idea what that is for sure normally holding down 2 number keys at boot up. |
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| Author: | Rich [ Sat Apr 30, 2011 11:41 am ] |
| Post subject: | Re: bc220 scanner deaf |
tonyclark wrote: Everything working just is deaf, tried different antennas. There is a red L.E.D. on the board it is not lit, is it suppost to be? What is it function? Everything is tight I don't see any loose solder joints. Any place to start looking? Yep solder joints are the #1 problem with those 220's. Next you should check the voltage regulators. Otherwise there is an op-amp that likes to die (LM358? heck I don't remember). Been there, done that. |
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| Author: | Jim [ Sat Apr 30, 2011 1:00 pm ] |
| Post subject: | Re: bc220 scanner deaf |
LM385 :D |
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| Author: | tonyclark [ Sat Apr 30, 2011 2:18 pm ] |
| Post subject: | Re: bc220 scanner deaf |
I was messing with it today and the weather bearly drifted in for about 1 sec. then faded out. Will make a good parts radio if can't be fixed. Vol. & Squelch work. It acts like there is no antenna hooked up. |
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| Author: | tonyclark [ Sun May 01, 2011 2:18 pm ] |
| Post subject: | Re: bc220 scanner deaf |
Seems there is a power resistor on the bottom of the board 1/2 watt size 1000 ohm that gets "soldering iron hot" Can't seem to find it in the service manual. |
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| Author: | Kerwin [ Tue May 03, 2011 11:50 pm ] |
| Post subject: | Re: bc220 scanner deaf |
Also be sure to verify that the DC to DC converter output is 25V. This circuit provides the juice to the VCO and RF "Track Tuning". Often C98 will fail and cause reduced or no voltage output. Kerwin |
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| Author: | tonyclark [ Wed May 04, 2011 11:43 am ] |
| Post subject: | Re: bc220 scanner deaf |
Anyplace sell a TIP29 without having to buy 500 of them. Found one place but $7 postage for a $0.30 part!! Haven't tried ratshack. |
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