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MODIFICATIONS FOR THE KENWOOD TR-7800
TR-7800 Loss of Memory
Intermittent loss of memory may be corrected by adding one resistor at the microprocessor on the control unit.
Procedure:
Remove bottom cover, 4 screws.
From the Control unit X53-1180-xx unplug the rear mounted connectors 8-11.
Remove 6 screws from the board.
Swing the unit forward.
Install a 470K ohm 1/8 watt or larger resistor from connector 11, "UP" pin, to ground. (microprocessor pin 35, PA2
port). Space is limited: Be certain not to create a solder bridge when installing the resistor.
Reverse steps 4-1 for reassembly.
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