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===Sub LCD Display Blank or Boxes===On the bottom right of the LCD Board thereis a black plastic momentary switch. I justpuched it once and it reset all the LCD parameters.VFO display, Clock, etc. That was it!reference: http://www.eham.net/ehamforum/smf/index.php?topic=68286.0Procedure verified. ===Vacuum Fluorescent Display problems===The Kenwood MC-42S is an 8-pin 600 ohm dynamic mic with up/down buttons on the top. Kenwood mic pin-out:*Pin 1 - Mic audio*Pin 2 - PTT*Pin 7 - Mic audio ground*Pin 8 - PTT ground==Service=====cooling fans===There are two of them. One for the voltage control and one on the finals. Both are in back of the unit but only one is visible without removal of case.Cooling fan: The cooling fan is connected to the AVR board. There is a thermister on the back panel inside. It can be removed so that the fans run continuous. This will burn up the OEM fans if ran continuous. Computer fans can run continuous. If the fan stops you will loose the AVR unit, very hard to find and now you have a door stop. The OEM fans are still around, but getting somewhat rare. It is better to replace them with computer fans, which are a lot less of a problem.===LCD Sub Display===If the LCD sub display starts to show garbage you can attempt a reset. The reset is a momentary button inside the unit, you will have to remove the case. So take off the top case and look at the board with a battery on it directly behind the LCD. Right of the battery and in the bottom corner of the board is the black reset button. Use a nonconductive tool to press it and reset the sub display.* NORTH CAROLINA* TEXAS[http://www.k3ten.com/index.htm K3TEN Electronics] (unverified) Amateur Radio Repair & Restoration* NEW JERSEY[[Category:Electronics]][[Category:Radio]][[Category:Ham Radio]][[Category:2-Way Radio]][[Category:Tangible Product]]