one of the issue which can happends on the Mizuho handies is lack of SSB TX as reported by John, W8BCR...
There are the hints and tips from our family members as follows:
Likewise i have a couple and both obtained cheap as faulty and not receiving. Both had the same problem which is that due to the weight of the xtal filter and its soldered connection on the pcb if the radio is dropped then the filter breaks away at the solder joint and hey presto NO REC.
quick solder job and back in business again .
Hi, I have a collection of nineteen (19) MX radio's , most problems I have encountered have been due to dirty slide switches, especially the SSB/CW change over, blast them with switch cleaner and rattle them up and down until your arm aches.
More details about this troubleshooting you can find on Mizuho and Nishi Musen Reflector by Caitlyn, K9NI over here:
Hope it helps to more owners,
73 - Petr, OK1RP