Zenith Z-100 PC series Service Manual page 187

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DISPLAY COLOR
BARS.
ALL PRESENT?
~NO
CHECK VIDEO
INPUT CABLE AND
CONNECTOR. OK?
~I
NO
I
REPLACE
I
COLORS APPEAR
YES
NORMAL?
~NO
CHECK CRT
VIDEO GAIN AND
~ WAVEFORM ~ SUSPECT CRT
CUTOFF
MISSING.Q).G).
ADJUSTMENTS.
OR
0.
OK?
~NO
@ (§)
SUSPECT OUTPUT
CHECK 4 • 5 • YES OR DRIVER
OR
0·
OK?
r=-
TRANSISTORS
~NO
SUSPECT IC51 01
CHECK
G).
0.
OR 0510515106.
OR@.OK?
~
OSl
07/S1
08.
05109/5110 ~NO
SUSPECT
COMPONENTS
BETWEEN SR9
~52°~_
Figure 6-4. Video Board Troubleshooting Chart
~
COMPARE WAVEFORMS
0-
@
TO LOCATE
FAULTY AREA: USE DC
VOLTAGE
MEASUREMENT TABLES
TO LOCATE FAULTY
AREA; USE RESISTANCE
MEASUREMENT TABLES
TO LOCATE FAULTY
AREA.