| Author |
Message |
    
Scorpion
Junior Member
Username: Scorpion
Post Number: 15
Registered: 4-2004
| | Posted on Friday, January 12, 2007 - 12:57 am: | 
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lost TX . RX works fine all modes.key up no tx,no meter movement,no rf power on ext meter,when key up mic the "on air" light comes on like it should.checked mic,ive have had this radio since new.all i installed was the fan kit & a switch on the brown&black wire.for low power op.i have tryed it in all modes am/lsb/usb/fm still no wattage!!! can anyone tell me the TR or diodes to check.i looked in the ranger site but iam not sure if the ranger boards & the turbos are the same.these are the blacksheep radios .the SATURN & the SATURN TURBO IS EVEN WORSE FOR FINDING ANY INFO.i see alot of posts but no reply on this problem with this radio.can you help or put me in the right direction? thanks. |
Inspector
Intermediate Member
Username: Inspector
Post Number: 167
Registered: 12-2001
| | Posted on Sunday, January 14, 2007 - 12:18 am: |
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You could have a problem with the TX/RX switching transistor, Q38- 2SA1282. On receive, the colector voltage should be 0.00v....on transmit it should about 7.95v. Emitter is 8.05v all the time and base is 8.02v on rx and 7.27 on tx. if that checks-out ok, check out Q51- the 2sb754 audio driver...those would be my starting points. (yes the board is the same as used in the RCI-2950/70...The Turbo is the equivalent of a base version of the 2970) |
Scorpion
Junior Member
Username: Scorpion
Post Number: 16
Registered: 4-2004
| | Posted on Monday, January 15, 2007 - 12:47 am: |
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hi checked the Q38-2sa1282.the voltages all checked out as you stated.the Q51 all checked good in the rx mode. should this driver be checked in the TX mode? i checked it both in rx & tx on am & on ssb. the voltages were not much lower in the tx mode at all.here are the voltages it gave me in AM RX mode E -13.83 C-6.28 B-13.33 .in the AM TX mode E- 13.80 C- 6.18 B-13.20 does this seem to be right? any other ideas? wishing it was just the Q38 but thats just my luck. |
Ajm1571
Intermediate Member
Username: Ajm1571
Post Number: 416
Registered: 12-2004
| | Posted on Friday, February 16, 2007 - 7:34 pm: |
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Sounds like a bridge rectifier to me scorpion. Mine did the same tihng an that was the culprit.Hopefully u have the problem fixed by now!
Allen
015 from MI
CEF565
CVC#38
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