Colour Television Chassis: M123A
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5. Faultfinding and Test Point with Waveform Diagram
5.1 Faultfinding
Fuse Blown
Is the drain of
Q801 shorted
to earth?
Yes
Cheek /
Replace
Q801
Is D815~D818
OK
?
Yes
Check IC801 and
the peripheral
components.
Replace
D815~D818
No
No
Figure 1 Fuse Blown
No raster
ab B
Is the + B,
resistance to earth
ok ?
Check the load of
B+
No
Yes
Check IC802 and their
peripheral components
Yes
Check Q830
Q831, Q832
etc.
Figure2 No Raster AbB
