1.0 IMPORTANT NOTICE & INTRODUCTION & SAFETY NOTICE1995VLX/VL2X/BLX
This monitor is provided with a high voltageCHECK OF HIGH VOLTAGE HOLD
hold down circuit for clearly indicating that
DOWN CIRCUIT
voltage has increased in excess of a
predetermined value. Comply with all notes
described in this Service Manual regarding thisChecking of the high voltage hold down circuit
hold down circuit when servicing, so that thisoperation.
hold down circuit may function correctly.
1. Turn the switch of the unit ON.
Service Warning
2. Set Brightness, Contrast controls to max..
With minimum Brightness and Contrast the
operation high voltage in this display is lower3. Short the two pins of P402 as shown in Fig. 2.
than 27KV.The picture should disappear immediately.
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:
P402
1) Turn power switch off without fail before making
Main Board Assembly
the connection to the Anode button.
2) Before turn power switch ON, confirm the AC Fig. 2
line voltage, set the ?Voltage Selector?.
4. Turn the switch of the unit OFF.
PRODUCT SAFETY NOTICE
CRT ANODE
+
Many electrical and mechanical parts in the color
CRT
monitor units have special safety related
-characteristics.
CHASSISHIGH IMPEDANCE
H.V. METERThese are often not evident from visual inspection
GROUNDSENSITIVE RESEARCH
nor can the protection afforded by them necessarilyModel:ESH or equivalent.
be obtained by using replacement components rated
Fig. 1for higher voltage, wattage, etc.. Replacement
parts which have these special safety
X-radiationcharacteristics are identified in this Service Manual.
TUBE: The primary source of X-radiation in thisElectrical components having such features are
monitor is the picture tube. The tube utilized inidentified by marking with ?!? on the parts list in this
this chassis is specially constructed to limit X-Service Manual.
radiation emissions. For continued X-radiation
protection, the replacement tube must be theThe use of a substitute replacement component
same type as the original, manufacturerwhich does not have the same safety
approved type. When troubleshooting andcharacteristics as the manufacturer recommended
making test measurements in a monitor with areplacement one, shown in the parts list in this
problem of excessive high voltage, avoid beingService Manual, may create shock, fire, X-radiation,
unnecessarily close to the picture tube and theor other hazards.
high voltage components. Do not operate the
chassis longer than is necessary to locate the
cause of excessive voltage.
2CTX |
ACEC
CTX
