CTX EX-710F, Руководство по обслуживанию

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1.0 IMPORTANT NOTICE & INTRODUCTION & SAFETY NOTICE CFA1797B
High Voltage
This monitor is provided with a high voltage hold
down circuit for clearly indicating that voltage
has 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
may function correctly.
Service Warning
With minimum Brightness and Contrast the
operation high voltage in this display is lower
than 27KV.
If any component having influence on the high
voltage is replaced, confirm that the high
voltage with minimum Brightness and Contrast
is lower than 27KV. To measure high voltage
use a high impedance high-voltage meter.
(SENSITIVE RESEARCH Model: ESH or
Equivalent) Connect (-) to chassis earth and (+)
to the CRT anode button. (See the following
connection diagram Fig. 1).
NOTE:
1) Turn power switch off without fail before making
the connection to the Anode button.
2) Before turn power switch ON, confirm the AC
line voltage, set the “Voltage Selector”.
Fig. 1
X-radiation
TUBE: The primary source of X-radiation in this
monitor is the picture tube. The tube utilized in
this chassis is specially constructed to limit X-
radiation emissions. For continued X-radiation
protection, the replacement tube must be the
same type as the original, manufacturer
approved type. When troubleshooting and
making test measurements in a monitor with a
problem of excessive high voltage, avoid being
unnecessarily close to the picture tube and the
high voltage components. Do not operate the
chassis longer than is necessary to locate the
cause of excessive voltage.
CHECK OF HIGH VOLTAGE HOLD
DOWN CIRCUIT
Checking of the high voltage hold down circuit
operation.
1. Turn the switch of the unit ON.
2. Set Brightness, Contrast controls to max..
3. Short the two pins of P402 as shown in Fig. 2.
The picture should disappear immediately.
D a t e : F e b r u a r y 1 4 , 1 9 9 8 S h e e t o f
S iz e D o c u m e n t N u m b e r R E V
A
P402
Main Board Assembly
Fig. 2
4. Turn the switch of the unit OFF.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the color
monitor units have special safety related
characteristics.
These are often not evident from visual inspection
nor can the protection afforded by them necessarily
be obtained by using replacement components rated
for higher voltage, wattage, etc.. Replacement parts
which have these special safety characteristics are
identified in this Service Manual.
Electrical components having such features are
identified by marking with “!” on the parts list in this
Service Manual.
The use of a substitute replacement component
which does not have the same safety characteristics
as the manufacturer recommended replacement
one, shown in the parts list in this Service Manual,
may create shock, fire, X-radiation, or other
hazards.
TECHNICIAN NOTICE
Please read before you attempt to repairing or
measure component, please use the way to get best
safety.
1. Pull the AC plug directly. When power
2 CTX
+
-
CRT ANODE
CHASSIS
GROUND
HIGH IMPEDANCE
H.V. METER
SENSITIVE RESEARCH
Model:ESH or equivalent.
CRT
8
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
76
80