| Author |
Message |
    
123upmichigan
| | Posted on Sunday, September 22, 2002 - 8:43 am: | 
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hello people i was wondering if someone might be able to help me. i am working on a radio for a freind and the turbo will work perfect when it is first turned on then about 5/10 min later of regular talking the power will drop od. variable power then does not much good.. i kinda figured it was an amp problem but the real kicker is when you shut it off for half an hour turn it on and it has another good ten minutes of talkin... i do have a fan on the heatsink of the radio and i would appreciate any help you have to give thank you 123upmichigan |
2600
| | Posted on Thursday, September 26, 2002 - 1:12 am: |
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Overheating is the weak link in the chain for this model. Sounds like this one is close to suicide. Adding one or more fans is just plain necessary, but this only fixes half the real heat problem.
The heat I'm talking about is not just the temperature of the heat sink, but the temperature of the PARTS. Without going into too much detail, we find EXTRA, dry (UNgreased) insulators under the bridge rectifier, voltage regulator transistors and regulator chip. The radio final/driver/modulator will often have too-thin a layer of heat-sink compound under them. This prevents the heat from escaping out of the part and into the heat sink, where it is supposed to go. The easiest first thing to try is to put the linear on standby. If this radio has never had this switch added, you can accomplish the same thing by looking at the radio chassis at the center of the radio, and finding the rear left (your left) corner of the circuit board. There is a small, shiny rectangle of circuit board about one inch by two, held in three fork-shaped metal fingers. At the left of that is a small, brown plastic plug with a brown wire and a black wire coming out of it. Pull out this plug from the socket on the circuit board. Now the radio will be 'barefoot'. This plug was what keyed the linear, and until you put it back in, the linear stays on standby. If the radio still loses power on transmit, the problem is in the radio at the center of the chassis. If it holds power and talks without falling down, it's time (or past time) for the anti-suicide treatment.
73 |
123upmichigan
| | Posted on Thursday, September 26, 2002 - 7:42 pm: |
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i appreciate it. after i will lube the sucker up i appreciate the help thanks a bunch sam |
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