| Author |
Message |
    
Slowride
New member
Username: Slowride
Post Number: 2
Registered: 1-2005
| | Posted on Monday, March 28, 2005 - 7:10 pm: | 
|
I have a RCI 2950 that went dead on transmit and recieve.It goes on and I can change frequency but there is no transmit or recieve.Its the older version, not the DX. Any ideas on whats the problem or where to look ? |
Mrbigshot
Junior Member
Username: Mrbigshot
Post Number: 48
Registered: 2-2005
| | Posted on Monday, March 28, 2005 - 7:34 pm: |
|
audio chip |
2600
Advanced Member
Username: 2600
Post Number: 524
Registered: 7-2002
| | Posted on Monday, March 28, 2005 - 11:20 pm: |
|
Well, the audio chip won't affect the transmit. Not on this model.
It won't affect the receiver S-meter on the display, either. If it still kicks around with channel chatter, I'd be surprised. From your description, I'll guess that it lays down at zero on receive, even with an antenna attached, and a busy channel selected.
My bets are on IC5, a 3-terminal 7805T voltage-regulator chip on the same side-rail as the audio power chip. It's between the two threaded holes for the side-bracket thumbscrews. If you have used a mount bracket for any amount of time, the solder connections on this chip (looks like a final transistor) will crack where they lap across the edge of the circuit board.
The outward "pull" force of the bracket's thumbscrews will make the side-rail flex where IC5 is bolted, and crack the regulator chip's solder connections to the edge of the circuit board.
This one will shut down the transmit and receive if one leg comes loose. There is another 7808T towards the front from IC5, marked IC6. If that one comes loose, you will lose the front-panel lights and display. If IC5 has come unsoldered, re-doing the connections to IC6 would be wise.
A close look at where the 3 legs on IC5 are lap-soldered to the circuit-board edge is about the cheapest of all the remaining possibilites.
Nearly every other likely cause will call for a 'scope, a diagram, and somebody who can read both.
73
|
Slowride
New member
Username: Slowride
Post Number: 3
Registered: 1-2005
| | Posted on Tuesday, March 29, 2005 - 1:28 pm: |
|
Well I finally found the time to sit and look at this radio. 2600, your advice were absolutely correct.My eyes are not good as it once was but I saw a hairline crack on one of the legs of IC5.Its now working great.Thanks for all the help.
73 and God bless |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 334
Registered: 9-2004
| | Posted on Tuesday, March 29, 2005 - 10:31 pm: |
|
nice job 2600!!!
matt |
2600
Advanced Member
Username: 2600
Post Number: 527
Registered: 7-2002
| | Posted on Wednesday, March 30, 2005 - 12:39 am: |
|
Congrats, Slowride.
Gotta love it when it's that simple and cheap.
You might consider putting a garden-hose coupling washer between the bracket and the radio's cabinet if there's a gap between the radio and the bracket. It'll reduce the "pull" factor the bracket puts on the chassis side rails. It's the flexibility of those side rails that causes this, not just the quality of the original soldering.
73
|
