After an incorrect power supply was connected to the Panasonic RF-D1 DAB radio, the fuse F301 seems to have failed. Does anyone know what the rating of this fuse should be and where I can get a replacement from?
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This could be as simple as a connector working loose. You need to open the radio by removing the 4 screws in the back of the case (2 are under the handle, and one is in the battery compartment). These screws are identified by a small arrow pointing at the screw hole. Once the screws are out, gently pry the bottom out first (the top has the catches in it), then pull down slightly and remove the back side of the case. there will be one wire on a connector going to the battery compartment you will have to disconnect before the back of the case is entirely free.
After the case is open you will have access to the connectors on the RF board. Make sure all 4 connectors are fully seated. There is another connector under the RF board going to the processor/display board you will need to check if the other 4 connectors are OK. You need to remove the 5 screws holding the main board in place so you can remove it to check the last connector.
You do not need to reassemble the radio to check to see if this has worked. You can plug the AC adapter in and test by pressing the power button.
If this does not work, there is a fuse you can check. These rarely fail, but it is possible. The fuse is located near the external power receptacle, and is mounted on the component side of the audio/potentiometer board. This is the circuit board with the volume, bass, and treble controls on it. You will be looking at the solder side of this board, but by tilting the radio up (with the back cover off) you cann see enough under the board to see the fuse. You can pop it out of its holder and check with an ohm meter.
The possibility is that the circuit not been used for a long time could have deteriorated in value in the circuit and so is not active.You can use a hair dryer to heat up the circuit and see if there is action on the board. Also use a AF signal trace or injection to check if the audio section and Rf section is working. you will need to trace the circuit using this signal tracing.
I solved the problem, but I did not "fix" the problem. Rather than rig an antenna to the old Panasonic RF-544 radio, I put it upstairs where it has good reception. I put the new Sony ICF-38 downstairs where it brings in the stations I listen to. The advertsizing claim for the Sony ICF-38 is that it has "Good Sound and High Sensitivity." I believe it does have "high sensitivity" because even in the basement it brings in my desired stations. (I am still curious to know if I could have rigged an antenna to the old Panasonic RF-544.) RL