Zenith Z-100 PC series Service Manual page 136

Warnings and Cautions
WARNING
Removing or lifting the ground from the AC power
source may present a potentially lethal shock hazard.
Do not use an AC two-to-three wire adapter plug with
this unit.
WARNING
The CRT anode retains a potentially lethal voltage
even when the monitor is turned off. Perform repairs
only after the CRT anode has been properly dis­
charged. Refer to Figure 6-1 and the following proce ­
dure to discharge the CRT anode:
1 . Connect a clip lead or heavy gauge wire to
chassis ground.
2. Connect the other end of the lead to the stem of
a flat-blade screwdriver that has an insulated
handle.
3. Insert the blade of the screwdriver under the
rubber insulation that covers the anode lead on
the CRT and make contact with the anode ter­
minal. Depending on the amount of charge pres­
ent on the anode, a distinct snap may be heard
as the CRT discharges.
WARNING
The switch mode power supply contains circuits that
generate dangerous high frequency, high amplitude,
quasi-square wave signals that present a potentially
lethal shock hazard. In the ZCM-1490, this circuitry is
located on a separate, exposed circuit board located
along the left side of the monitor when viewed from
the back. Do not attempt to service the power supply.
WARNING
To prevent both personal injury and equipment
damage, always use an isolation transformer when
troubleshooting this monitor.
CAUTION
Under no circumstances should the original design
be modified or altered without permission from Zenith
Electronics Corporation. All components should be
replaced only with types identical to those in the
original circuit, and their physical location, wiring, and
lead dress must conform to the original layout upon
completion of repairs.
CAUTION
Some components contain an X in their reference
number. For safety reasons, these components must
be replaced only with identical components.