3.3.3 Plug & Play (DDC2B) Operation Error
Check the SCL line.
Expected failure point
IC217 or D2C1 on the VIDEO PWB, or signal cable
Check the waveform at Pin 4 of IC217 on the VIDEO PWB.
(Approx. 5Vp-p)
OK
NG
Approx. 5V
Check the voltage at Pin 11 of IC102 on the MAIN PWB.
Expected failure point
D2C1 on the VIDEO PWB
Approx. 0V
DDC1 communication is maintained.
3.3.4 Degaussing Functional Operation Error
Expected failure point
1) Degaussing coil
2) TH902, RL901, D950 or R954 on the POWER
Confirm that the potential at Pin 47 of IC102 on the MAIN PWB turns the HIGH
level for about 6 seconds when manual degaussing is carried out with OSM.
OK
NG
Expected failure point
IC102 on the MAIN PWB
Check the degaussing control line.
OK
NG
Make checking with CN904 connected.
Check the connections of CN904 on the POWER PWB.
3-16
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 ...