Follow on from this thread.
https://www.vintage-radio.net/forum/...83#post1017983
The SX400 uses 1 or 2 supercaps for memory backup. Normally about 36 hours. Early versions of the manual do not make clear that once the backup has run out the receiver will not power up correctly until a memory reset is carried out.
To do a reset hinge down the flap, with the JIL logo on it, its at the lower left corner of the front panel. The catch can be quite tight so you may need to use something like a steel ruler to pop it out. As well as various slide switches you will see a recessed reset button. Using a blunt object press the reset within a second or two of powering up. The display should now be showing 26.000 Mhz. Unfortunately you need to repeat this procedure every time the backup 'battery' goes flat.
Perhaps it is just me but I do not find this receiver easy to operate. Having the manual to hand is a must.
Al