XOCECO TQ2426, Service Manual

1

Safety instruction

1. X-RAY radiation precaution

1.1 Excessive voltage will cause harmful X-ray. To avoid this radiation hazard, the high voltage should 
fall within the limitation. The appliance works at AC 120V, 60Hz. The high voltage of zero beam current 
(brightness is min) should be within 30kV on condition that the main power voltage is 110V(13”, 20”), 
130V(24”) and 135V(37”). And it should not exceed 33kV in any condition.   

When servicing, please refer to the HIGH VOLTAGE CHECK procedure this service manual before 
check the high voltage and the high voltage meter should be reliable and accurate. 
* Keep the main power voltage at 110V(13”, 20”), 130V(24”) and 135V(37”) when checking the high 
voltage. 
1.2 The primary source of X-RAY RADIATION is the CRT. The CRT of this TV set have gotten the 
approval of safety authentication inspection. The replacement CRT should be exactly the same type and 
specification CRT which has gotten a similar safety approval, and check the high voltage according to 
the HIGH VOLTAGE CHECK procedure. 

2. Safety precaution 

a. Since the power supply circuit of this receiver is directly connected to the AC power line, an isolation 
transformer is necessary during dynamic service to avoid possible shock hazard. 
b. Always discharge the graphite layer conductor when moving the CRT. 
c. Disconnect the power cord before replacing parts. 
d. When replacing high-power resistor, keep the resistor 10 mm away from the circuit board. 

3. Component safety precaution 

Many electrical and mechanical parts in the chassis have special safety-related characteristics. These 
characteristics are often passed unnoticed by a visual inspection. Replacement parts which have these 
special safety characteristics are identified in this manual and its supplement electrical components 
having such features are shaded or marked by        on the schematic diagram and the parts list. Before 
replacing any of these components, read the parts list in this manual carefully. The use of substitute 
replacement parts which do not have the same characteristic as specified in the parts list may create 
shock, fire, X-RAY RADIATION or other hazards. 

General instruction 

1. Copy the standard model data to let EEPROM (N101)of the chassis have those data before placing 

it on the unit, do “factory adjustment” if necessary. If use a blank EEPROM directly, you should preset IIC 
data and then do other common adjustment.   

2.The adjustment should be done under following circumstances without additional instruction 

a) Alternating current 120V/60Hz 
b) Preheat at least 30 min 

3.The unit has auto degaussing circuit, the auto degaussing process can be finished within 1s when 

the main power. Only when turn on the unit at least 30min after last time turn off TV does the auto 

Note: This service manual is only for professional service personnel’s reference. Before 

servicing the unit, please read the following items carefully.