IBM 5150 - Page 93

Press (Enter). This will return you to an all black @
screen. Selecting
the all black screen will place a signal on pins
3,4,5, and 6 of the 9 pin connector of between 0.0 and 0.5
Vdc.
At the phono-jack connector, the voltage between the 0
two test points should be 0.0 and 0.9 Vdc. Measure the
voltage present at pins 3,4, 5, and 6 of the 9 pin connector
and the voltage between the center and outer edge of the
phono-jack.
o
o
WERE YOU ABLE TO READ THE PROPER VOLTAGE?
NO Replace your Color/Graphics Monitor Adapter. See
Section 3,
"Removal/Replacement."
YES
500-22