1. Cautions
Whenworking, the unit is with ultra highvoltage about 21.8KV inside. So, to avoid the risk of
electricshock, be careful to adjust the chassis!
1. Only qualified personnel should perform service procedures.
2. All specification must be met over line voltage ranger of 120VAC60Hz.
3. Do not operate in WET/DAMP conditions.
4. Portions of the powersupply board are hot ground. The remaining boards are cold ground.
5. Discharge of CRT anode should be done only to CRT ground strap.
6. When fuse blow, ensure to replace a fuse with the same type and specification.
7. Keep the wires away from the components with high temperature or high voltage.
8. When replacing the resister with high power, keep it over the PCB about 10mm.
9. The CRT anode high voltage has been adjusted and set in the factory. When repairing the
chassis, do not make the high voltage exceed 24.0KV (The beam current is 0uA). Generally,
the high voltage is set on 21.8KV±1.5KV (The beam current is 500uA).
* The values of parameters above are for information only.
10. Before return the fixed unit, do check all the covering of wires to ensure that not fold or not
short with any metal components. Check the entire protection units, such as control knobs,
rearcabinet & front panel, insulationresister& capacitor,mechanical insulators and so on.
11. There are some mechanical and electrical parts associating with safety (EMC) features
(Generally related to high voltage or high temperature or electric shock), these features cannot
be found out from the outside. When replace these components, perhapsthe voltage and
power suit the requirements, but efficient X-ray protection may not be provided. All these
components are marked with in the schematicdiagram. Whenreplace these, you’d
better lookup the components listed in this manual. If the component you replacednot has the
same safety (EMC) performance, harmful X-ray may be produced.
TTE Overseas Support Department
