01-07-2014, 12:22 AM
I have had some workshop time this evening.
It was pretty easy to open it up.
The handle is best removed. This is done by placing the set across your knees and patting the carry handle down so that it clicks off the studs. Once the screws are out the front panel needs to be eased off the backing plate with some care as it has tabs that are bent into slots. The knobs are different. The volume is a round shaft and the tuning has a flat.
The little patch of rust on the transformer bracket is small enough that it is likely to end up looking worse if an attempt is made to remove it. I will leave it alone.
The loose volume control nut was indeed just the fixing nut so it was a quick fix.
The dial is clear PVC and the original glue was too brittle and had let go. I have used some slow setting conformal stuff that shot under the inside by capillary action and must now be left to set over night.
The PCB has got a clean bill of health on all three bands and requires no work. It is just two chips and three transistors. It looks like the oscillator coil for the FM is on a former slipped over the transistor. That is a cunning way of getting a bit of coupling between the two components for sure.
If I do go for an on board charger there is a plug in trick without modification.
There is a link plug between the transformer plate and the main board. A pair of connectors to fit this will be needed and then all other charging gear can hide in the NIMH battery itself including a charge state test device and all that sort of stuff.
There is a diode that prevents the battery trying to take charge from the transformer. This is odd as there is switching ganged with the mains lead connector. This means that with a battery fitted the set is uninterruptible in the event of a power failure. Perhaps a diode was cheaper than four soldered connections in the day.
There is an odd resistor on the rectifier that appears to be across the battery on the unswitched side that would make the battery go flat. It appears to have been cut out as a factory modification and rightly so too.
It was pretty easy to open it up.
The handle is best removed. This is done by placing the set across your knees and patting the carry handle down so that it clicks off the studs. Once the screws are out the front panel needs to be eased off the backing plate with some care as it has tabs that are bent into slots. The knobs are different. The volume is a round shaft and the tuning has a flat.
The little patch of rust on the transformer bracket is small enough that it is likely to end up looking worse if an attempt is made to remove it. I will leave it alone.
The loose volume control nut was indeed just the fixing nut so it was a quick fix.
The dial is clear PVC and the original glue was too brittle and had let go. I have used some slow setting conformal stuff that shot under the inside by capillary action and must now be left to set over night.
The PCB has got a clean bill of health on all three bands and requires no work. It is just two chips and three transistors. It looks like the oscillator coil for the FM is on a former slipped over the transistor. That is a cunning way of getting a bit of coupling between the two components for sure.
If I do go for an on board charger there is a plug in trick without modification.
There is a link plug between the transformer plate and the main board. A pair of connectors to fit this will be needed and then all other charging gear can hide in the NIMH battery itself including a charge state test device and all that sort of stuff.
There is a diode that prevents the battery trying to take charge from the transformer. This is odd as there is switching ganged with the mains lead connector. This means that with a battery fitted the set is uninterruptible in the event of a power failure. Perhaps a diode was cheaper than four soldered connections in the day.
There is an odd resistor on the rectifier that appears to be across the battery on the unswitched side that would make the battery go flat. It appears to have been cut out as a factory modification and rightly so too.
