Specifications

Chapter 2: Getting Started
2 – 14
C. Powering down the ZVG and Vector Monitor
For reasons of monitor safety it is important that the monitor be either turned off
simultaneously with the ZVG, or that the ZVG be turned off first, or at least brought
to a state where vectors are not being generated, before turning off the vector moni
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tor.
For color monitors this is the safest way of powering down. For the G05 and
WG2000 monitors,
THIS IS ABSOLUTELY MANDATORY to prevent phosphor burn!
Warning to G05 and WG2000 Users PLEASE READ!!
CAUTION!! For users of the G05 series and WG2000 series B&W vector monitors, the
power down sequence between the ZVG and monitor is very critical!
The Electrohome G05 series and WG2000 Series mon-
itors have High Voltages that turn off very slowly. If
they are being driven by a signal while being powered
down, it is very possible for a bright spot to develop in
the middle of the screen that can lead to phosphor
burn!!
The ZVG must be either powered down, or all vector gen-
eration turned off (exit all PC software) before powering
down a G05 or WG2000 monitor!
This warning exists on Page 2 of the G05 Preliminary Ser-
vice Manual:
“CAUTION: REMOVE INPUT SIGNAL FROM GAME BOARD TO DEFLEC-
TION AMPLIFIER BOARD IN MONITOR BEFORE REMOVING POWER TO
REGULATOR BOARD IN MONITOR.”
Which is a cryptic way of saying “Turn the game off
before the monitor”.
Simultaneous powering down of the ZVG and monitor is
also acceptable, and the ZVG has been designed with this
in mind.
This problem is a problem with the spot killer design in
the G05 and WG2000 monitors. When power is lost on
these monitors, the deflection circuits and the spot killers
no longer operate, yet the HV on the monitor can be
present for some time after power is shut down. During
this time if a signal is present on the Z-axis, a high inten
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