Zenith Data Systems Z-171 PC Series Service Manual page 82

Page 6-8
System Checkout and Troubleshooting
OSCILLOSCOPE SETTINGS: VERTICAL
50V/DIVISION
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HORIZONTAL
500yS/DIVISION
Figure 6-3: LCD Power Input Waveform
Step 2: LCD
STEP PROCEDURE
2 Is the screen scrambled?
2a Is the AC adapter properly connected?
2b Change the main logic board and return
to step 2.
Step 3: Disk Drives
STEP PROCEDURE
3 Insert a disk in drive A. Does the com-
puter access the disk drive correctly?
3a Insert a disk in drive B. Does the com-
puter access the disk drive correctly?
YES
2a
2b
YES
3a
os
NO
lb
NO
3b
3b