Zenith Data Systems Z-171 PC Series Service Manual page 79

Page 6-5
System Checkout and Troubleshooting
Troubleshooting Procedure
The following procedure is in a question and answer form, with a yes
or no answer derived from most steps.
When the answer to the question is a yes, the YES column will indicate
which step to proceed to. If the answer is a no, the NO column will
indicate which step to proceed to. See step 1 for an example.
When a dash (—) is listed in the column, the fault has been identified
and/or corrected, or no action is required. In these cases the text will
indicate which step to proceed to in order to retest the fault area. See
step Ic for an example.
NOTE: The computer has a screen saver function that turns off the screen
if an entry is not made through the keyboard for a short time. While
using the AC adapter, the screen will remain on for approximately 10
minutes. While using the battery, the screen will remain on for approxi-
mately 1.5 minutes. Press any key to re-activate the screen. This function
can be defeated by accessing the setup menu and turning the screen
saver to OFF.
Step 1: General Power
STEP PROCEDURE YES NO
1 Switch on the power switch. Does the
screen light? Z la
la Adjust the contrast knob. Does the screen
light now? Z Ib
lb Is the AC adapter plugged into an operat-
ing outlet? Id Ic
Ic Switch off the computer power switch,
plug the computer into an operating out-
let, and return to step 1. — =