Tauras TV4K-NICAM/A2/TXT Service Manual - page 3
the chassis parts list.
8. The receiver is designed to operate with 230V(50Hz) AC mains.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics
are often passed unnoticed by a visual inspection and the X-RAY RADIATON protection
afforded by them cannot necessarily be obtained by using replacement components rated for
higher voltage. The use of substitute replacement parts that do not have the same safety
characteristics as specified in the parts list may create shock, fire, X-RAY RADIATION or
other hazards.
GENERAL ADJUSTMENT
AUTOMATIC DEGAUSSING
An automatic degaussing coil is attached around the picture tube, degaussing the tube properly
in about one second after the set is switched on. If the receiver is moved or faced on a different
direction, the power must be switched off at least 15 minutes in order that the automatic
degaussing circuit operated properly. External degaussing is necessary if the automatic
degassing proves ineffective after the set is moved.
B+ ADJUSTMENT
C
AUTION: To avoid X-ray hazards and result in a nominal display width, B+ voltage must be
set in the scale of 140.0V+/-1.0V.
1. Make sure the AC power supply is 230V, 50Hz.
2. Switch on the TV receiver, tune in an active channel.
3. Measure the voltage between C641 on Main P.C. Board by DC voltmeter.
4. Set contrast, brightness, color to maximum.
5. Adjust VR631 on Main P. C. Board for B+140.0V+/-1.0V voltage reading.
HIGH VOLTAGE CHECK
C
AUTION: There is no high voltage adjustment in this chassis, B+140V voltage directly
relates to the high voltage. The high voltage does not exceed 29KV under any conditions.
1. Connect an accurate high voltage meter to the second anode cap of the picture tube.
2. Turn on the receiver, set brightness and contrast to minimum (Zero beam current).
3. Make sure the high voltage does not exceed 29KV.