3.2 Abnormal Picture
3.2.1 Raster Brightness Failure
Check the screen voltage
.
Expected failure point
T701 (FBT), CRT socket or screen leads
Measure the voltage at CN201 on the CRT PWB.
Usually the screen voltage is 600 to 800V
NG
Expected failure point
The video circuit is failure. (See Item 3.4.5
)
OK
3.2.2. Image Color Failure or Contrast Failure
Check the video signal input.
Expected failure point
Signal cable
Measure the voltage at Pins 1(R), 2(G) and 3(B) of CN215 and CN216 on the VIDEO
PWB.
Usually, the video input signal is maintained at 0.7Vp-p.
NG
Expected failure point
The video circuit (See Item 3.4.5)
OK
3-4
Summary of Contents for DPro2070SB
Page 22: ...1 15 Fig 7 The principle of DDCC compensation ...
Page 23: ...1 16 Fig 8 a DDCC adjustment item ...
Page 24: ...1 17 Fig 8 b DDCC adjustment item ...
Page 25: ...1 18 Fig 9 DDCC circuit diagram ...
Page 103: ...4 Wave form 1 POWER 2 CONTROL MAIN 3 DEFL MAIN 4 DEFL SUB COIL DRIVE MAIN 5 VIDEO ...