FEATURES ESH or Equivalent)
Connect (-) to chassis earth and (+) to the CDT anode
1. Flat screen CRT with anti-glare, dynamic focus circuit, button. (See the following connection diagram Fig. 1.)
dark glass, and INVAR shadow mask give the NOTE: Turn power switch off without fail before making
sharpest focus and highest contrast.
2. Automatic scanning and automatic adjustment to the connection to the Anode button
conform to a wide range of scanning frequencies and
user requirements. CDT ANODE
3. Signal input allows D-Sub Mini 15-pin cable.
4. Power Save Mode automatically puts the monitor into (+)
a standby mode (power consumption less than 15W)
when the H.sync. signal is not detected, and a power - (-)
off mode (less than 5W) when the V.sync. signal is not
detected. Normal mode is restored immediately when
the H. sync. signal and the V.sync. signal are detected. HIGH IMPEDANCE
This feature prolongs monitor life and reduces energy H.V. METER
consumption by up to about 75 %. SENSITIVE RESEARCH
SAFETY PRECAUTIONS Model: ESH or equivalent. CHASSIS GROUND
FIG. 1
NOTICE: Comply with all cautions and safety related
notes located on or inside the cabinet and on the chassis
or picture tube. X-radiation
The following precautions must be observed. TUBE: The source of X-radiation in this monitor is the
1. Do not install, remove, or handle the picture tube in picture tube. The tube utilized in this chassis is specially
any manner unless shatterproof goggles are worn. constructed to limit X-radiation emissions.
People not so equipped should be kept away while For continued X-radiation protection, the replacement
picture tubes are handled. tube must be the same type as the original, manufacturer
2. When replacing a chassis in the monitor, all the approved type.
protective devices must be put back in place, such as, When troubleshooting and making test measurements in
barriers, non-metallic knobs, adjustment and compartment a monitor with a problem of excessive high voltage, avoid
being unnecessarily close to the picture tube and the high
shields, and isolation resistor-capacitor, etc. voltage components.
3. When service is required, observe the original lead Do not operate the chassis longer than is necessary to
dress. Extra precaution should be taken to assure locate the cause of excessive voltage.
correct lead dress in the high voltage circuitry area.
4 Always use the manufacturer?s replacement components.
Especially critical components as indicated on the CHECK OF HIGH VOLTAGE HOLD DOWN
circuit diagram should not be replaced by other
manufacturer?s one. Furthermore where a short circuit CIRCUIT
has occurred, replace those components that Checking of the high Voltage hold down circuit operation.
indicate evidence of overheating. 1. Turn the switch of the unit ON, and set the Brightness
5. Before returning a serviced monitor to the customer, and Contrast controls to max.
the service personnel must thoroughly test unit to be 2. Turn the switch of the unit OFF.
certain that it is completely safe to operate without 3. Connect a DC Voltmeter and an adjustment jig as
danger of electrical shock, and be sure that no shown in Fig. 2.
protective device built into the monitor by the 4. Set the adjustment VR to fully counterclockwise.
manufacturer has become defective, or inadvertently 5. Turn the switch of the unit ON and gradually rotate the
defeated during servicing.
Therefore, the following checks should be performed adjustment VR clockwise.
for continued protection of the customer and service 6. Check that a reading of DC voltage-meter is less-than
technician. 0.6?0.1 V when picture disappears.
6. In the case of the microprocessor unit, shop 7. Turn the switch of the unit OFF immediately after
adjustment is necessary after exchange of the checking that the picture disappears.
8. Remove the adjusting jig and the DC voltmeter.
microprocessor unit. NOTE:Reading of 0.6 V is approximately equivalent to
High Voltage
This monitor is provided with a high voltage hold down 30 kV of CDT Anode High Voltage.
circuit for clearly indicating that voltage has increased in
excess of a predetermined value.
Comply with 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 operating
high voltage in this display is lower than 30 kV.
If any component having influence on the high voltage is
replaced, confirm that the high voltage with minimum
Brightness and Contrast is lower than 30 kV.
To measure high voltage use a high impedance
high-voltage meter. (SENSITIVE RESEARCH Model:
2 |
ACEC
