30
LCD Display Circuit Check
Is clock pulse of
approx.25.00MHz at
IC100-pin19?
Is clock pulse of
approx.14.318MHz at IC206-
pin6(VCOIN)?
Is Hsync inputted to IC100-
pin109?
Is Vsync inputted to IC100-
pin110?
Do input signal to IC100-
pin110(Vsync) and output signal
from IC100-pin130(VSC) have the
same frequency?
Is IC100-pin129(F256HS)
approx.61.326Hz ?
Are the output levels from
IC100-pin126(HPOL) and
pin127(VPOL) both high?
Failure of Hsync/ Vsync input circuit
or signal cable
Failure of IC100 or its
peripheral circuits.
6
OSC1 failure.
No
Yes
Yes
No
No
Yes
No
Yes
No
Yes
No
Yes
Input a digital video signal.
(CGA type; 14.318MHz)
5
7
8
5
6
7
8
Summary of Contents for QD-101MM
Page 39: ...38 6 CIRCUIT DIAGRAM PWB Fig 27 CIRCUIT DIAGRAM MAIN CIRCUIT No 1 ...
Page 40: ...39 Fig 27 CIRCUIT DIAGRAM MAIN CIRCUIT No 1 ...
Page 41: ...40 Fig 28 CIRCUIT DIAGRAM MAIN CIRCUIT No 2 ...
Page 42: ...41 Fig 28 CIRCUIT DIAGRAM MAIN CIRCUIT No 2 ...
Page 43: ...42 Fig 29 CIRCUIT DIAGRAM MAIN CIRCUIT No 3 ...
Page 44: ...43 Fig 29 CIRCUIT DIAGRAM MAIN CIRCUIT No 3 ...
Page 45: ...44 Fig 30 CIRCUIT DIAGRAM MAIN CIRCUIT No 4 ...
Page 46: ...45 Fig 30 CIRCUIT DIAGRAM MAIN CIRCUIT No 4 ...
Page 47: ...46 Fig 31 CIRCUIT DIAGRAM POWER CIRCUIT ...
Page 48: ...47 Fig 31 CIRCUIT DIAGRAM POWER CIRCUIT ...
Page 49: ...48 Fig 32 CIRCUIT DIAGRAM VIDEO CIRCUIT ...
Page 50: ...49 Fig 32 CIRCUIT DIAGRAM VIDEO CIRCUIT ...
Page 51: ...50 Fig 33 CIRCUIT DIAGRAM AUDIO CIRCUIT ...
Page 52: ...51 Fig 33 CIRCUIT DIAGRAM AUDIO CIRCUIT ...
Page 53: ...52 Fig 34 PWB PATTERN MAIN PWB FRONT SIDE ...
Page 54: ...53 Fig 34 PWB PATTERN MAIN PWB REAR SIDE ...
Page 66: ...PRINTED IN GERMANY ...
