Texas Instruments 99/4A - Page 116

RAM TRAP OPERATING INSTRUCTIONS
TEST Switch
FUNCTION Position
INDICATORS
COMMENTS
4116' s
U1O2-U1O9
1 2 3 4 5 6
L See I
Comments- 1
1. Turn Unit To Be Tested "Off"
2. Insert RAM Trap
3. Select Test Mode On Ram Trap
4. Turn "On" Unit To Be Tested
5. Press LOAD Switch 107
Error Test Bit
Error Test Bit
^Multiple Bit Errors
Bad Chip ----------------- n
LED's
6810's
U608, U609
1®
_
1
1
__
©1
T 6^- o o o
1 2 3 4 5 6
II
1 1 MSB LSB
LSB MSB Bad
Testing
Mest In Progress
2nd & 3rd Indicators should
alternate SLOWLY .
5th Indicator shows MSB ERROR.
6th Indicator shows LSB ERROR.
^Testing In Progress
2155 2156 2157
ROMS
4732's
U610, U611
o o o o -'o?
\ ___ ____ / 1 *
5 6
LEDS 1-4 not used
5th & 6th LEDS alternate during test
alternation will stop on error
BEFORE EACH TEST MAKE SURE THE UNIT UNDER TEST IS SWITCHED OFF.
START UP PROCEDURE :