3.3 Functional Errors
3.3.1 OSM Failure
Note: See “3.2 Abnormal picture” if a screen is not available even though a video signal input is entered.
Check the OSM signal output.
Expected failure point
IC211, R2D0-R2D2 or R2F6 on the VIDEO PWB
Measure the waveform at Pins 16-19 of IC212 on the VIDEO PWB while the
SELECT button is pressed. (Approx. 5Vp-p)
Expected failure point
R2D5 on the VIDEO PWB, or AFC line
OK
NG
Check the vertical sync input of IC212.
Expected failure point
IC6A1 or Pin 32 of IC102
OK
NG
Check the OSM control line (I
2
C).
Measure the waveform at Pin 14 of IC212 on
the VIDEO PWB. (Approx. 5Vp-p)
Expected failure point
IC212 on the VIDEO PWB
NG
OK
Measure the waveform at Pin 7 and 8 of IC212 on
the VIDEO PWB. (Approx. 5Vp-p)
Expected failure point
IC102 on the MAIN PWB
OK
Expected failure point
SW101-SW107 on the MAIN PWB, R10A-R10G, R10K or R10L
NG
Measure the voltage at Pins 22 and 23 of user control IC102 on the MAIN PWB.
Check the user control IC on the MAIN PWB.
Check the horizontal sync input of IC212.
OK
NG
Horizontal period
Pins 17,18, 19
Horizontal period
Pin 16
Measure the waveform at Pin 5 of IC212 on
the VIDEO PWB. (Approx. 5Vp-p)
Horizontal period
Vertical period
3-14
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 ...