Vector G08 Series Faq page 22

G08 Vector Monitor Guide
R918 on the HV unit. The HV unit may be shutting down because of the input signal sensitivity
settings.
Symptom: Fuse 600/700 blows
Fuse 700: Check transistors Q703; Q704; Q705; Q706.
Fuse 600: Check transistors Q603; Q604; Q605; Q606.
These fuses almost NEVER blow, so something must be REALLY screwed up. The schematics
state that these are 3 amp fuses. The silkscreen on the boards say 4 amp 125V SB (Buss. f u se
MDL). I'd go with the 4 amp.
Symptom: Picture has retrace lines between points, and a bright dot is in the center of the
picture
If the dot is one particular color, adjust the color pots on the neck board. These control the drive of
the color guns. If there is still a dot, try turning down the brightness control on the deflection board.
Sometimes the solder joints for this pot, and the nearby resistor, break and can cause the brightness
to shoot up too high. If the dot is still present, try adjusting R933 on the HV unit.
Symptom: The neon bulbs on the neck board are glowing
These are not supposed to light. These are spark gap bulbs, meaning that if they light, your guns are
sparking internally. Most likely there is a problem with the tube.
When debugging the monitor, you may need to swap the deflection board in and out quite often,
and it gets to be a pain to hook up the focus each time. If you want, you can actually leave this lead
disconnected while debugging. Tie a piece of electrically tape around the end so it does not
accidentally touch anything. When you finally get a picture, remember that the picture will be
extremely out of focus. You will, however, be able to tell that there is a picture. Also, double check
that all the connectors are connected each time you swap out the deflection board.
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