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054.SB829.DOC
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1993-04-19
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757b
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33 lines
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
Downloaded From P-80 International Information Systems 304-744-2253