Ham friend of mine has a Kenwood TS-830S. Works fine on all bands
except the readout/receiver/transmitter intermittently goes out on the
10 Mhz and 21 Mhz bands. More off than on. He has the maintenance
manual but nothing in there about it.

Any guidance/help on what or where to begin looking at would be
appreciated. He is an excellent technician but this one has him
stumped. Thanks.
73 Murray, K3BEQ