SOURCE: cobra 29ltd classic : no rx / tx
Hi,
D23 is the reverse protection diode and it shorting is the primary
reason your fuse blew. As you posted, power was applied in reverse,
hence other components would also fail. Pls check:
1. D22 - 9.1V Zener Diode
2. TR23 (2SC1096) 9 Volts regulator
3. D19 - 5.1 Zener Diode
4. IC4 (TA7222) - Audio Amp
5. TR14 (2SC2029B/10) - Finals
6. TR15 (2SC2028B/20) - Driver
7. Most capacitors over 220uF (like C123, C114 & C112)
Hope that this be of help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
SOURCE: general lee no tx or rx
sounds like a cold solder joint on the voltage regulator or the regulator itself.
SOURCE: 148GTL Cobra (no tx)
the dx 2527 has a fine ransmitter. it is choked out by the factory to pass FCC reg's. With about $4.00 in parts from the rat shack you can really make it talk. my personal 2527 dead keys around 3 watts with around 45 50 watts on rms with bird meter around 60 with crappy dosey.
SOURCE: tx: fine rx : no..
Your power output has blown, they are called your "finals" they can be replaced quite cheaply.
SOURCE: cx80 stuck in rx mode , power cycled, swapped
But thats how a walkie talkie works, it stays in Receive Rx mode UNTIL you press the PTT button,, then it Transmits Tx, and when released it goes back to Rx, receive?
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