Vector 4 - Page 185

VECTOR GRAPHIC, INC.
SYMPTOM
CHECK
NORMAL ABNORMAL
1. No banner or
display on CRT
Voltage at Main
Power Supply
+5vde +/= .25v
+12vde +/- .25v
~12vde +/- .25v
If all three voltages
are low or 0, make
sure that:
a. system is plugged ir
b. power at wall
socket is o.k.
c. fuses in terminal &re
0.K.
If only 1 or 2 voltages
are low or 0, replace
power supply.
SBC Voltage
V100 pins:
1
2
52
+Svde +/- .25v
+12vde +/- .25v
-12vde +/- .25v
If voltages are low
or 0, check for con-
tinuity between power
supply and SBC.
| will boot.
Voltage at CRT
video driver
PCBA
See if system
+12vde +/- .25v
If system boots (i.e.,
drive LED lights and/or
disk accessed),
Check for continuity
between power supply
and video driver PCBA.
Replace SBC.
continue.
Hsync and Vsyne Hsyne J13-5 If any one is missing,
at SBC Vsyne J13-4 replace SBC.
Check same at
video driver
PCBA
Video on J13-2
Same as above:
replace CRT and
video driver
PCBA
Check for continuity
between video driver
PCBA and CRT
V 3-2
7200-0001
09-01-82