CTX EX-710F, Service Manual

Page: 5 / 101

CFA1797B 1.0 IMPORTANT NOTICE & INTRODUCTION & SAFETY NOTICE
1.0 IMPORTANT NOTICE &
INTRODUCTION & SAFETY
NOTICE
IMPORTANT NOTICE
Please read before attempting service
1. While the monitor is in operation, do not attempt
to connect or disconnect any wires.
2. Make sure the power cord is disconnected
before replacing any parts in the monitor.
3. When the power is on, do not attempt to short
any portion of the circuit. This shorting may
cause damage to the components in the monitor.
4. When servicing the H.V. area, be certain that the
C.R.T anode is safely discharged before
removing the anode cap.
5. Caution must exercised when servicing this
monitor.
INTRODUCTION
Enhanced repair capabilities
This Service Manual is edited for model CFA1797B
when service is necessary. there are four primary
parts included in this troubleshooting guide which
offer the easiest way to locate problem points and
repair the machine to the best possible condition.
1. The Adjustment Section offers the adjustable
method, steps and all data of the factory's initial
settings which can make the machine get the
best performance at that time. By the way,
before adjusting, the machine must be warmed
up for at least 10 minutes and the CRT face
must be in an east ward direction.
2. The Troubleshooting Section has five main
parts including: power supply, micon circuit,
CRT, deflection & video circuit. Each offers
fast repair routine and the IC, transistor voltage
records against all specified signal modes.
These voltage readings are measured with a
HP 34401A multimeter with input impedance
10M (0.1V~1000V range) and waveforms
shown on circuit schematics
are measured by a Tektronix TDS 520 digital
oscilloscope, the monitor receives VGA-480 full
white square pattern.
3. The Spare parts list offers the CTX part number
(P/N) which is used frequently by repairmen /
technicians. For details please refer to the
service guide or service manual. If there is any
engineering change regarding this model, CTX
will issue the updated information by a non-
periodical Technical Bulletin.
4. The transistor voltage records are measured
from LEFT side to RIGHT side when face to the
front (printed side) of transistor.
SAFETY PRECAUTIONS
NOTICE : Comply with all cautions and safety
related notes located on or inside the cabinet and on
the chassis or picture tube.
The following precautions should be observed.
1. Do not install, remove, or handle the picture
tube in any manner unless shatterproof goggles
are worn. People not so equipped should be
kept away while picture tubes are handled.
Keep picture tube away from the body while
handling.
2. When replacing a chassis in the monitor, all the
protective devices must be put back in place,
such as barriers, non-metallic knobs,
adjustment and compartment shields, and
isolation resistor-capacitor, etc..
3. When service is required, observe the original
lead dress. Extra precaution should be taken to
assure correct lead dress in the high voltage
circuitry area.
4. Always use the manufacturer’s replacement
components. Especially critical components as
indicated on the Replacement parts list should
not be replaced by other manufacturer’s
Furthermore where a short circuit has occurred,
replace those components that indicate
evidence of overheating.
5. Before returning a serviced monitor to the
customer, the service technician must
thoroughly test the unit to be certain that it is
completely safe to operate without danger of
electrical shock, and be sure that no protective
device built into the monitor by the manufacturer
has become defective, or inadvertently defeated
during servicing. Therefore, the following
checks should be performed for continued
protection of the customer and service
technician.
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