81.0 IMPORTANT NOTICE & INTRODUCTION & SAFETY NOTICECFA1797B
High Voltage2. Set Brightness, Contrast controls to max..
This monitor is provided with a high voltage hold483. Short the two pins of P402 as shown in Fig. 2.
down circuit for clearly indicating that voltageThe picture should disappear immediately.
4has increased in excess of a predetermined
value. Comply with all notes described in this
Service Manual regarding this hold down circuit
when servicing, so that this hold down circuit
8may function correctly.
Service Warning
With minimum Brightness and Contrast the
operation high voltage in this display is lower
12than 27KV.DSaizAtee:D oFceubmrueantr yN 1u4m, b1e9r98SheetofREV
P402
If any component having influence on the high
voltage is replaced, confirm that the high
52Main Board Assembly
voltage with minimum Brightness and Contrast
16is lower than 27KV. To measure high voltage
Fig. 2
use a high impedance high-voltage meter.
(SENSITIVE RESEARCH Model: ESH or
4. Turn the switch of the unit OFF.
Equivalent) Connect (-) to chassis earth and (+)
20to the CRT anode button. (See the following
connection diagram Fig. 1).PRODUCT SAFETY NOTICE
NOTE:
56Many electrical and mechanical parts in the color
monitor units have special safety related
1) Turn power switch off without fail before making
characteristics.
24the connection to the Anode button.
These are often not evident from visual inspection
2) Before turn power switch ON, confirm the AC
60nor can the protection afforded by them necessarily
line voltage, set the Voltage Selector .
be obtained by using replacement components rated
for higher voltage, wattage, etc.. Replacement parts
Fig. 1CRT ANODE
which have these special safety characteristics are
+64identified in this Service Manual.
28X-radiation
CRT
Electrical components having such features are
TUBE: Th-e primary source of X-radiation in this
identified by marking with ! on the parts list in this
monitor is the picture tube. The tube utilized in
HIGH IMPEDANCEService Manual.
CHASSIS
H.V. tMhisETE Rchassis is specially constructed to limit X-
GROUND
SENSITIVE RESEARCH
32radiation emissions. For continued X-radiation
Model:ESH or equivalent.68The use of a substitute replacement component
protection, the replacement tube must be the
which does not have the same safety characteristics
same type as the original, manufacturer
as the manufacturer recommended replacement
approved type. When troubleshooting and
one, shown in the parts list in this Service Manual,
36making test measurements in a monitor with a
72may create shock, fire, X-radiation, or other
problem of excessive high voltage, avoid being
hazards.
unnecessarily close to the picture tube and the
high voltage components. Do not operate the
40chassis longer than is necessary to locate the
cause of excessive voltage.
TECHNICIAN NOTICE
CHECK OF HIGH VOLTAGE HOLD
76
DOWN CIRCUIT
Please read before you attempt to repairing or
measure component, please use the way to get best
44Checking of the high voltage hold down circuit
safety.
operation.
801. Pull the AC plug directly. When power
1. Turn the switch of the unit ON.
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