SB-829 TR-7800 Loss of Memory 7-31-80 Intermittent loss of memory may be corrected by adding one resistor at the microprocessor on the control unit. Procedure: 1. Remove bottom cover, 4 screws. 2. From the Control unit X53-1180-xx unplug the rear mounted connectors 8-11. 3. Remove 6 screws from the board. 4. Swing the unit forward. 5. 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. 6. Reverse steps 4-1 for reassembly. JEB/yn (c) 73180TKC